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Author SHA1 Message Date
Ben Widawsky
a38a59fdfa mm/mempolicy: advertise new MPOL_PREFERRED_MANY 
Adds a new mode to the existing mempolicy modes, MPOL_PREFERRED_MANY.

MPOL_PREFERRED_MANY will be adequately documented in the internal
admin-guide with this patch.  Eventually, the man pages for mbind(2),
get_mempolicy(2), set_mempolicy(2) and numactl(8) will also have text
about this mode.  Those shall contain the canonical reference.

NUMA systems continue to become more prevalent.  New technologies like
PMEM make finer grain control over memory access patterns increasingly
desirable.  MPOL_PREFERRED_MANY allows userspace to specify a set of nodes
that will be tried first when performing allocations.  If those
allocations fail, all remaining nodes will be tried.  It's a straight
forward API which solves many of the presumptive needs of system
administrators wanting to optimize workloads on such machines.  The mode
will work either per VMA, or per thread.

[Michal Hocko: refine kernel doc for MPOL_PREFERRED_MANY]

Link: https://lore.kernel.org/r/20200630212517.308045-13-ben.widawsky@intel.com
Link: https://lkml.kernel.org/r/1627970362-61305-5-git-send-email-feng.tang@intel.com
Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
Signed-off-by: Feng Tang <feng.tang@intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-09-03 09:58:17 -07:00
Charan Teja Reddy
65d759c8f9 mm: compaction: support triggering of proactive compaction by user 
The proactive compaction[1] gets triggered for every 500msec and run
compaction on the node for COMPACTION_HPAGE_ORDER (usually order-9) pages
based on the value set to sysctl.compaction_proactiveness.  Triggering the
compaction for every 500msec in search of COMPACTION_HPAGE_ORDER pages is
not needed for all applications, especially on the embedded system
usecases which may have few MB's of RAM.  Enabling the proactive
compaction in its state will endup in running almost always on such
systems.

Other side, proactive compaction can still be very much useful for getting
a set of higher order pages in some controllable manner(controlled by
using the sysctl.compaction_proactiveness).  So, on systems where enabling
the proactive compaction always may proove not required, can trigger the
same from user space on write to its sysctl interface.  As an example, say
app launcher decide to launch the memory heavy application which can be
launched fast if it gets more higher order pages thus launcher can prepare
the system in advance by triggering the proactive compaction from
userspace.

This triggering of proactive compaction is done on a write to
sysctl.compaction_proactiveness by user.

[1]https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit?id=facdaa917c4d5a376d09d25865f5a863f906234a

[akpm@linux-foundation.org: tweak vm.rst, per Mike]

Link: https://lkml.kernel.org/r/1627653207-12317-1-git-send-email-charante@codeaurora.org
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Rafael Aquini <aquini@redhat.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Nitin Gupta <nigupta@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Khalid Aziz <khalid.aziz@oracle.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Vinayak Menon <vinmenon@codeaurora.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-09-03 09:58:17 -07:00
Linus Torvalds
23852bec53 RDMA v5.15 merge window Pull Request 
- Various cleanup and small features for rtrs
 
 - kmap_local_page() conversions
 
 - Driver updates and fixes for: efa, rxe, mlx5, hfi1, qed, hns
 
 - Cache the IB subnet prefix
 
 - Rework how CRC is calcuated in rxe
 
 - Clean reference counting in iwpm's netlink
 
 - Pull object allocation and lifecycle for user QPs to the uverbs core
   code
 
 - Several small hns features and continued general code cleanups
 
 - Fix the scatterlist confusion of orig_nents/nents introduced in an
   earlier patch creating the append operation
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma

Pull rdma updates from Jason Gunthorpe:
 "This is quite a small cycle, no major series stands out. The HNS and
  rxe drivers saw the most activity this cycle, with rxe being broken
  for a good chunk of time. The significant deleted line count is due to
  a SPDX cleanup series.

  Summary:

   - Various cleanup and small features for rtrs

   - kmap_local_page() conversions

   - Driver updates and fixes for: efa, rxe, mlx5, hfi1, qed, hns

   - Cache the IB subnet prefix

   - Rework how CRC is calcuated in rxe

   - Clean reference counting in iwpm's netlink

   - Pull object allocation and lifecycle for user QPs to the uverbs
     core code

   - Several small hns features and continued general code cleanups

   - Fix the scatterlist confusion of orig_nents/nents introduced in an
     earlier patch creating the append operation"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma: (90 commits)
  RDMA/mlx5: Relax DCS QP creation checks
  RDMA/hns: Delete unnecessary blank lines.
  RDMA/hns: Encapsulate the qp db as a function
  RDMA/hns: Adjust the order in which irq are requested and enabled
  RDMA/hns: Remove RST2RST error prints for hw v1
  RDMA/hns: Remove dqpn filling when modify qp from Init to Init
  RDMA/hns: Fix QP's resp incomplete assignment
  RDMA/hns: Fix query destination qpn
  RDMA/hfi1: Convert to SPDX identifier
  IB/rdmavt: Convert to SPDX identifier
  RDMA/hns: Bugfix for incorrect association between dip_idx and dgid
  RDMA/hns: Bugfix for the missing assignment for dip_idx
  RDMA/hns: Bugfix for data type of dip_idx
  RDMA/hns: Fix incorrect lsn field
  RDMA/irdma: Remove the repeated declaration
  RDMA/core/sa_query: Retry SA queries
  RDMA: Use the sg_table directly and remove the opencoded version from umem
  lib/scatterlist: Fix wrong update of orig_nents
  lib/scatterlist: Provide a dedicated function to support table append
  RDMA/hns: Delete unused hns bitmap interface
  ...
 2021-09-02 14:47:21 -07:00
Linus Torvalds
7ba88a2a09 platform-drivers-x86 for v5.15-1 
Highlights:
  - Move all the Intel drivers into their own subdir(s) (mostly Kate's work)
  - New meraki-mx100 platform driver
  - Asus WMI driver enhancements, including
    /sys/firmware/acpi/platform_profile support
  - New BIOS SAR driver for Intel M.2 WWAM modems
  - Alder Lake support for the Intel PMC driver
  - A whole bunch of cleanups + fixes all over the place
 
 The following is an automated git shortlog grouped by driver:
 
 BIOS SAR driver for Intel M.2 Modem:
  - BIOS SAR driver for Intel M.2 Modem
 
 ISST:
  -  use semi-colons instead of commas
  -  Fix optimization with use of numa
 
 Replace deprecated CPU-hotplug functions.:
  - Replace deprecated CPU-hotplug functions.
 
 Update Mario Limonciello's email address in the docs:
  - Update Mario Limonciello's email address in the docs
 
 acer-wmi:
  -  Add Turbo Mode support for Acer PH315-53
 
 add meraki-mx100 platform driver:
  - add meraki-mx100 platform driver
 
 asus-nb-wmi:
  -  Add tablet_mode_sw=lid-flip quirk for the TP200s
  -  Allow configuring SW_TABLET_MODE method with a module option
 
 asus-wmi:
  -  Fix "unsigned 'retval' is never less than zero" smatch warning
  -  Delete impossible condition
  -  Add support for platform_profile
  -  Add egpu enable method
  -  Add dgpu disable method
  -  Add panel overdrive functionality
 
 dell-smbios:
  -  Remove unused dmi_system_id table
 
 dell-smbios-wmi:
  -  Add missing kfree in error-exit from run_smbios_call
  -  Avoid false-positive memcpy() warning
 
 dell-smo8800:
  -  Convert to be a platform driver
 
 dual_accel_detect:
  -  Use the new i2c_acpi_client_count() helper
 
 gigabyte-wmi:
  -  add support for B450M S2H V2
  -  add support for X570 GAMING X
 
 hp_accel:
  -  Convert to be a platform driver
  -  Remove _INI method call
 
 i2c:
  -  acpi: Add an i2c_acpi_client_count() helper function
 
 i2c-multi-instantiate:
  -  Use the new i2c_acpi_client_count() helper
 
 ideapad-laptop:
  -  Fix Legion 5 Fn lock LED
 
 intel-hid:
  -  Move to intel sub-directory
 
 intel-rst:
  -  Move to intel sub-directory
 
 intel-smartconnect:
  -  Move to intel sub-directory
 
 intel-uncore-frequency:
  -  Move to intel sub-directory
 
 intel-vbtn:
  -  Move to intel sub-directory
 
 intel-wmi-sbl-fw-update:
  -  Move to intel sub-directory
 
 intel-wmi-thunderbolt:
  -  Move to intel sub-directory
 
 intel_atomisp2:
  -  Move to intel sub-directory
 
 intel_bxtwc_tmu:
  -  Move to intel sub-directory
 
 intel_cht_int33fe:
  -  Use the new i2c_acpi_client_count() helper
 
 intel_chtdc_ti_pwrbtn:
  -  Move to intel sub-directory
 
 intel_int0002_vgpio:
  -  Move to intel sub-directory
 
 intel_mrfld_pwrbtn:
  -  Move to intel sub-directory
 
 intel_oaktrail:
  -  Move to intel sub-directory
 
 intel_pmc_core:
  -  Move to intel sub-directory
  -  Prevent possibile overflow
 
 intel_pmt_telemetry:
  -  Ignore zero sized entries
 
 intel_punit_ipc:
  -  Move to intel sub-directory
 
 intel_scu_ipc:
  -  Fix doc of intel_scu_ipc_dev_command_with_size()
 
 intel_speed_select_if:
  -  Move to intel sub-directory
 
 intel_telemetry:
  -  Move to intel sub-directory
 
 intel_turbo_max_3:
  -  Move to intel sub-directory
 
 lg-laptop:
  -  Use correct event for keyboard backlight FN-key
  -  Use correct event for touchpad toggle FN-key
  -  Support for battery charge limit on newer models
 
 platform/mellanox:
  -  mlxbf-pmc: fix kernel-doc notation
 
 platform/surface:
  -  aggregator: Use y instead of objs in Makefile
  -  surface3_power: Use i2c_acpi_get_i2c_resource() helper
 
 platform/x86/intel:
  -  pmc/core: Add GBE Package C10 fix for Alder Lake PCH
  -  pmc/core: Add Alder Lake low power mode support for pmc core
  -  pmc/core: Add Latency Tolerance Reporting (LTR) support to Alder Lake
  -  pmc/core: Add Alderlake support to pmc core driver
  -  int3472: Use y instead of objs in Makefile
  -  pmt: Use y instead of objs in Makefile
  -  int33fe: Use y instead of objs in Makefile
  -  Move Intel PMT drivers to new subfolder
 
 thermal/drivers/intel:
  -  Move intel_menlow to thermal drivers
 
 think-lmi:
  -  add debug_cmd
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Merge tag 'platform-drivers-x86-v5.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86

Pull x86 platform driver updates from Hans de Goede:
 "Highlights:

   - Move all the Intel drivers into their own subdir(s) (mostly Kate's
     work)

   - New meraki-mx100 platform driver

   - Asus WMI driver enhancements, including support for
     /sys/firmware/acpi/platform_profile

   - New BIOS SAR driver for Intel M.2 WWAM modems

   - Alder Lake support for the Intel PMC driver

   - A whole bunch of cleanups + fixes all over the place"

* tag 'platform-drivers-x86-v5.15-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86: (65 commits)
  platform/x86: dell-smbios-wmi: Add missing kfree in error-exit from run_smbios_call
  platform/x86: dell-smbios-wmi: Avoid false-positive memcpy() warning
  platform/x86: ISST: use semi-colons instead of commas
  platform/x86: asus-wmi: Fix "unsigned 'retval' is never less than zero" smatch warning
  platform/x86: asus-wmi: Delete impossible condition
  platform/x86: hp_accel: Convert to be a platform driver
  platform/x86: hp_accel: Remove _INI method call
  platform/mellanox: mlxbf-pmc: fix kernel-doc notation
  platform/x86/intel: pmc/core: Add GBE Package C10 fix for Alder Lake PCH
  platform/x86/intel: pmc/core: Add Alder Lake low power mode support for pmc core
  platform/x86/intel: pmc/core: Add Latency Tolerance Reporting (LTR) support to Alder Lake
  platform/x86/intel: pmc/core: Add Alderlake support to pmc core driver
  platform/x86: intel-wmi-thunderbolt: Move to intel sub-directory
  platform/x86: intel-wmi-sbl-fw-update: Move to intel sub-directory
  platform/x86: intel-vbtn: Move to intel sub-directory
  platform/x86: intel_oaktrail: Move to intel sub-directory
  platform/x86: intel_int0002_vgpio: Move to intel sub-directory
  platform/x86: intel-hid: Move to intel sub-directory
  platform/x86: intel_atomisp2: Move to intel sub-directory
  platform/x86: intel_speed_select_if: Move to intel sub-directory
  ...
 2021-09-02 13:49:39 -07:00
Andy Shevchenko
17b121ad0c Documentation: ACPI: Align the SSDT overlays file with the code 
This updates the following:

1) The ASL code to follow latest ACPI requirements, i.e.
   - static buffer to be defined outside of the method
   - The _ADR and _HID shouldn't be together for the same device

2) EFI section relies on the additional kernel configuration option,
   i.e. CONFIG_EFI_CUSTOM_SSDT_OVERLAYS

3) Refer to ACPI machine language as AML (capitalized)

4) Miscellaneous amendments

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 2021-09-02 18:08:16 +02:00
Linus Torvalds
4ac6d90867 Yet another set of documentation changes: 
- A reworking of PDF generation to yield better results for documents
    using CJK fonts in particular.
 
  - A new set of translations into traditional Chinese, a dialect for which
    I am assured there is a community of interested readers.
 
  - A lot more regular Chinese translation work as well.
 
 ...plus the usual assortment of updates, fixes, typo tweaks, etc.
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Merge tag 'docs-5.15' of git://git.lwn.net/linux

Pull documentation updates from Jonathan Corbet:
 "Yet another set of documentation changes:

   - A reworking of PDF generation to yield better results for documents
     using CJK fonts in particular.

   - A new set of translations into traditional Chinese, a dialect for
     which I am assured there is a community of interested readers.

   - A lot more regular Chinese translation work as well.

  ... plus the usual assortment of updates, fixes, typo tweaks, etc"

* tag 'docs-5.15' of git://git.lwn.net/linux: (55 commits)
  docs: sphinx-requirements: Move sphinx_rtd_theme to top
  docs: pdfdocs: Enable language-specific font choice of zh_TW translations
  docs: pdfdocs: Teach xeCJK about character classes of quotation marks
  docs: pdfdocs: Permit AutoFakeSlant for CJK fonts
  docs: pdfdocs: One-half spacing for CJK translations
  docs: pdfdocs: Add conf.py local to translations for ascii-art alignment
  docs: pdfdocs: Preserve inter-phrase space in Korean translations
  docs: pdfdocs: Choose Serif font as CJK mainfont if possible
  docs: pdfdocs: Add CJK-language-specific font settings
  docs: pdfdocs: Refactor config for CJK document
  scripts/kernel-doc: Override -Werror from KCFLAGS with KDOC_WERROR
  docs/zh_CN: Add zh_CN/accounting/psi.rst
  doc: align Italian translation
  Documentation/features/vm: riscv supports THP now
  docs/zh_CN: add infiniband user_verbs translation
  docs/zh_CN: add infiniband user_mad translation
  docs/zh_CN: add infiniband tag_matching translation
  docs/zh_CN: add infiniband sysfs translation
  docs/zh_CN: add infiniband opa_vnic translation
  docs/zh_CN: add infiniband ipoib translation
  ...
 2021-09-01 18:49:47 -07:00
Linus Torvalds
df43d90382 printk changes for 5.15 
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Merge tag 'printk-for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux

Pull printk updates from Petr Mladek:

 - Optionally, provide an index of possible printk messages via
   <debugfs>/printk/index/. It can be used when monitoring important
   kernel messages on a farm of various hosts. The monitor has to be
   updated when some messages has changed or are not longer available by
   a newly deployed kernel.

 - Add printk.console_no_auto_verbose boot parameter. It allows to
   generate crash dump even with slow consoles in a reasonable time
   frame.

 - Remove printk_safe buffers. The messages are always stored directly
   to the main logbuffer, even in NMI or recursive context. Also it
   allows to serialize syslog operations by a mutex instead of a spin
   lock.

 - Misc clean up and build fixes.

* tag 'printk-for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/printk/linux:
  printk/index: Fix -Wunused-function warning
  lib/nmi_backtrace: Serialize even messages about idle CPUs
  printk: Add printk.console_no_auto_verbose boot parameter
  printk: Remove console_silent()
  lib/test_scanf: Handle n_bits == 0 in random tests
  printk: syslog: close window between wait and read
  printk: convert @syslog_lock to mutex
  printk: remove NMI tracking
  printk: remove safe buffers
  printk: track/limit recursion
  lib/nmi_backtrace: explicitly serialize banner and regs
  printk: Move the printk() kerneldoc comment to its new home
  printk/index: Fix warning about missing prototypes
  MIPS/asm/printk: Fix build failure caused by printk
  printk: index: Add indexing support to dev_printk
  printk: Userspace format indexing support
  printk: Rework parse_prefix into printk_parse_prefix
  printk: Straighten out log_flags into printk_info_flags
  string_helpers: Escape double quotes in escape_special
  printk/console: Check consistent sequence number when handling race in console_unlock()
 2021-09-01 18:41:13 -07:00
Linus Torvalds
57c78a234e arm64 updates for 5.15: 
- Support for 32-bit tasks on asymmetric AArch32 systems (on top of the
   scheduler changes merged via the tip tree).
 
 - More entry.S clean-ups and conversion to C.
 
 - MTE updates: allow a preferred tag checking mode to be set per CPU
   (the overhead of synchronous mode is smaller for some CPUs than
   others); optimisations for kernel entry/exit path; optionally disable
   MTE on the kernel command line.
 
 - Kselftest improvements for SVE and signal handling, PtrAuth.
 
 - Fix unlikely race where a TLBI could use stale ASID on an ASID
   roll-over (found by inspection).
 
 - Miscellaneous fixes: disable trapping of PMSNEVFR_EL1 to higher
   exception levels; drop unnecessary sigdelsetmask() call in the
   signal32 handling; remove BUG_ON when failing to allocate SVE state
   (just signal the process); SYM_CODE annotations.
 
 - Other trivial clean-ups: use macros instead of magic numbers, remove
   redundant returns, typos.
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 updates from Catalin Marinas:

 - Support for 32-bit tasks on asymmetric AArch32 systems (on top of the
   scheduler changes merged via the tip tree).

 - More entry.S clean-ups and conversion to C.

 - MTE updates: allow a preferred tag checking mode to be set per CPU
   (the overhead of synchronous mode is smaller for some CPUs than
   others); optimisations for kernel entry/exit path; optionally disable
   MTE on the kernel command line.

 - Kselftest improvements for SVE and signal handling, PtrAuth.

 - Fix unlikely race where a TLBI could use stale ASID on an ASID
   roll-over (found by inspection).

 - Miscellaneous fixes: disable trapping of PMSNEVFR_EL1 to higher
   exception levels; drop unnecessary sigdelsetmask() call in the
   signal32 handling; remove BUG_ON when failing to allocate SVE state
   (just signal the process); SYM_CODE annotations.

 - Other trivial clean-ups: use macros instead of magic numbers, remove
   redundant returns, typos.

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (56 commits)
  arm64: Do not trap PMSNEVFR_EL1
  arm64: mm: fix comment typo of pud_offset_phys()
  arm64: signal32: Drop pointless call to sigdelsetmask()
  arm64/sve: Better handle failure to allocate SVE register storage
  arm64: Document the requirement for SCR_EL3.HCE
  arm64: head: avoid over-mapping in map_memory
  arm64/sve: Add a comment documenting the binutils needed for SVE asm
  arm64/sve: Add some comments for sve_save/load_state()
  kselftest/arm64: signal: Add a TODO list for signal handling tests
  kselftest/arm64: signal: Add test case for SVE register state in signals
  kselftest/arm64: signal: Verify that signals can't change the SVE vector length
  kselftest/arm64: signal: Check SVE signal frame shows expected vector length
  kselftest/arm64: signal: Support signal frames with SVE register data
  kselftest/arm64: signal: Add SVE to the set of features we can check for
  arm64: replace in_irq() with in_hardirq()
  kselftest/arm64: pac: Fix skipping of tests on systems without PAC
  Documentation: arm64: describe asymmetric 32-bit support
  arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  ...
 2021-09-01 15:04:29 -07:00
Linus Torvalds
ba1dc7f273 Char / Misc driver changes for 5.15-rc1 
Here is the big set of char/misc driver changes for 5.15-rc1.
 
 Lots of different driver subsystems are being updated in here, notably:
 	- mhi subsystem update
 	- fpga subsystem update
 	- coresight/hwtracing subsystem update
 	- interconnect subsystem update
 	- nvmem subsystem update
 	- parport drivers update
 	- phy subsystem update
 	- soundwire subsystem update
 and there are some other char/misc drivers being updated as well:
 	- binder driver additions
 	- new misc drivers
 	- lkdtm driver updates
 	- mei driver updates
 	- sram driver updates
 	- other minor driver updates.
 
 Note, there are no habanna labs driver updates in this pull request,
 that will probably come later before -rc1 is out in a different request.
 
 All of these have been in linux-next for a while with no reported
 problems.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'char-misc-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char / misc driver updates from Greg KH:
 "Here is the big set of char/misc driver changes for 5.15-rc1.

  Lots of different driver subsystems are being updated in here,
  notably:

   - mhi subsystem update

   - fpga subsystem update

   - coresight/hwtracing subsystem update

   - interconnect subsystem update

   - nvmem subsystem update

   - parport drivers update

   - phy subsystem update

   - soundwire subsystem update

  and there are some other char/misc drivers being updated as well:

   - binder driver additions

   - new misc drivers

   - lkdtm driver updates

   - mei driver updates

   - sram driver updates

   - other minor driver updates.

  Note, there are no habanalabs driver updates in this pull request,
  that will probably come later before -rc1 is out in a different
  request.

  All of these have been in linux-next for a while with no reported
  problems"

* tag 'char-misc-5.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (169 commits)
  Revert "bus: mhi: Add inbound buffers allocation flag"
  misc/pvpanic: fix set driver data
  VMCI: fix NULL pointer dereference when unmapping queue pair
  char: mware: fix returnvar.cocci warnings
  parport: remove non-zero check on count
  soundwire: cadence: do not extend reset delay
  soundwire: intel: conditionally exit clock stop mode on system suspend
  soundwire: intel: skip suspend/resume/wake when link was not started
  soundwire: intel: fix potential race condition during power down
  phy: qcom-qmp: Add support for SM6115 UFS phy
  dt-bindings: phy: qcom,qmp: Add SM6115 UFS PHY bindings
  phy: qmp: Provide unique clock names for DP clocks
  lkdtm: remove IDE_CORE_CP crashpoint
  lkdtm: replace SCSI_DISPATCH_CMD with SCSI_QUEUE_RQ
  coresight: Replace deprecated CPU-hotplug functions.
  Documentation: coresight: Add documentation for CoreSight config
  coresight: syscfg: Add initial configfs support
  coresight: config: Add preloaded configurations
  coresight: etm4x: Add complex configuration handlers to etmv4
  coresight: etm-perf: Update to activate selected configuration
  ...
 2021-09-01 08:35:06 -07:00
Linus Torvalds
9e9fb7655e Core: 
- Enable memcg accounting for various networking objects.
 
 BPF:
 
  - Introduce bpf timers.
 
  - Add perf link and opaque bpf_cookie which the program can read
    out again, to be used in libbpf-based USDT library.
 
  - Add bpf_task_pt_regs() helper to access user space pt_regs
    in kprobes, to help user space stack unwinding.
 
  - Add support for UNIX sockets for BPF sockmap.
 
  - Extend BPF iterator support for UNIX domain sockets.
 
  - Allow BPF TCP congestion control progs and bpf iterators to call
    bpf_setsockopt(), e.g. to switch to another congestion control
    algorithm.
 
 Protocols:
 
  - Support IOAM Pre-allocated Trace with IPv6.
 
  - Support Management Component Transport Protocol.
 
  - bridge: multicast: add vlan support.
 
  - netfilter: add hooks for the SRv6 lightweight tunnel driver.
 
  - tcp:
     - enable mid-stream window clamping (by user space or BPF)
     - allow data-less, empty-cookie SYN with TFO_SERVER_COOKIE_NOT_REQD
     - more accurate DSACK processing for RACK-TLP
 
  - mptcp:
     - add full mesh path manager option
     - add partial support for MP_FAIL
     - improve use of backup subflows
     - optimize option processing
 
  - af_unix: add OOB notification support.
 
  - ipv6: add IFLA_INET6_RA_MTU to expose MTU value advertised by
          the router.
 
  - mac80211: Target Wake Time support in AP mode.
 
  - can: j1939: extend UAPI to notify about RX status.
 
 Driver APIs:
 
  - Add page frag support in page pool API.
 
  - Many improvements to the DSA (distributed switch) APIs.
 
  - ethtool: extend IRQ coalesce uAPI with timer reset modes.
 
  - devlink: control which auxiliary devices are created.
 
  - Support CAN PHYs via the generic PHY subsystem.
 
  - Proper cross-chip support for tag_8021q.
 
  - Allow TX forwarding for the software bridge data path to be
    offloaded to capable devices.
 
 Drivers:
 
  - veth: more flexible channels number configuration.
 
  - openvswitch: introduce per-cpu upcall dispatch.
 
  - Add internet mix (IMIX) mode to pktgen.
 
  - Transparently handle XDP operations in the bonding driver.
 
  - Add LiteETH network driver.
 
  - Renesas (ravb):
    - support Gigabit Ethernet IP
 
  - NXP Ethernet switch (sja1105)
    - fast aging support
    - support for "H" switch topologies
    - traffic termination for ports under VLAN-aware bridge
 
  - Intel 1G Ethernet
     - support getcrosststamp() with PCIe PTM (Precision Time
       Measurement) for better time sync
     - support Credit-Based Shaper (CBS) offload, enabling HW traffic
       prioritization and bandwidth reservation
 
  - Broadcom Ethernet (bnxt)
     - support pulse-per-second output
     - support larger Rx rings
 
  - Mellanox Ethernet (mlx5)
     - support ethtool RSS contexts and MQPRIO channel mode
     - support LAG offload with bridging
     - support devlink rate limit API
     - support packet sampling on tunnels
 
  - Huawei Ethernet (hns3):
     - basic devlink support
     - add extended IRQ coalescing support
     - report extended link state
 
  - Netronome Ethernet (nfp):
     - add conntrack offload support
 
  - Broadcom WiFi (brcmfmac):
     - add WPA3 Personal with FT to supported cipher suites
     - support 43752 SDIO device
 
  - Intel WiFi (iwlwifi):
     - support scanning hidden 6GHz networks
     - support for a new hardware family (Bz)
 
  - Xen pv driver:
     - harden netfront against malicious backends
 
  - Qualcomm mobile
     - ipa: refactor power management and enable automatic suspend
     - mhi: move MBIM to WWAN subsystem interfaces
 
 Refactor:
 
  - Ambient BPF run context and cgroup storage cleanup.
 
  - Compat rework for ndo_ioctl.
 
 Old code removal:
 
  - prism54 remove the obsoleted driver, deprecated by the p54 driver.
 
  - wan: remove sbni/granch driver.
 
 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Merge tag 'net-next-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:
 "Core:

   - Enable memcg accounting for various networking objects.

  BPF:

   - Introduce bpf timers.

   - Add perf link and opaque bpf_cookie which the program can read out
     again, to be used in libbpf-based USDT library.

   - Add bpf_task_pt_regs() helper to access user space pt_regs in
     kprobes, to help user space stack unwinding.

   - Add support for UNIX sockets for BPF sockmap.

   - Extend BPF iterator support for UNIX domain sockets.

   - Allow BPF TCP congestion control progs and bpf iterators to call
     bpf_setsockopt(), e.g. to switch to another congestion control
     algorithm.

  Protocols:

   - Support IOAM Pre-allocated Trace with IPv6.

   - Support Management Component Transport Protocol.

   - bridge: multicast: add vlan support.

   - netfilter: add hooks for the SRv6 lightweight tunnel driver.

   - tcp:
       - enable mid-stream window clamping (by user space or BPF)
       - allow data-less, empty-cookie SYN with TFO_SERVER_COOKIE_NOT_REQD
       - more accurate DSACK processing for RACK-TLP

   - mptcp:
       - add full mesh path manager option
       - add partial support for MP_FAIL
       - improve use of backup subflows
       - optimize option processing

   - af_unix: add OOB notification support.

   - ipv6: add IFLA_INET6_RA_MTU to expose MTU value advertised by the
     router.

   - mac80211: Target Wake Time support in AP mode.

   - can: j1939: extend UAPI to notify about RX status.

  Driver APIs:

   - Add page frag support in page pool API.

   - Many improvements to the DSA (distributed switch) APIs.

   - ethtool: extend IRQ coalesce uAPI with timer reset modes.

   - devlink: control which auxiliary devices are created.

   - Support CAN PHYs via the generic PHY subsystem.

   - Proper cross-chip support for tag_8021q.

   - Allow TX forwarding for the software bridge data path to be
     offloaded to capable devices.

  Drivers:

   - veth: more flexible channels number configuration.

   - openvswitch: introduce per-cpu upcall dispatch.

   - Add internet mix (IMIX) mode to pktgen.

   - Transparently handle XDP operations in the bonding driver.

   - Add LiteETH network driver.

   - Renesas (ravb):
       - support Gigabit Ethernet IP

   - NXP Ethernet switch (sja1105):
       - fast aging support
       - support for "H" switch topologies
       - traffic termination for ports under VLAN-aware bridge

   - Intel 1G Ethernet
       - support getcrosststamp() with PCIe PTM (Precision Time
         Measurement) for better time sync
       - support Credit-Based Shaper (CBS) offload, enabling HW traffic
         prioritization and bandwidth reservation

   - Broadcom Ethernet (bnxt)
       - support pulse-per-second output
       - support larger Rx rings

   - Mellanox Ethernet (mlx5)
       - support ethtool RSS contexts and MQPRIO channel mode
       - support LAG offload with bridging
       - support devlink rate limit API
       - support packet sampling on tunnels

   - Huawei Ethernet (hns3):
       - basic devlink support
       - add extended IRQ coalescing support
       - report extended link state

   - Netronome Ethernet (nfp):
       - add conntrack offload support

   - Broadcom WiFi (brcmfmac):
       - add WPA3 Personal with FT to supported cipher suites
       - support 43752 SDIO device

   - Intel WiFi (iwlwifi):
       - support scanning hidden 6GHz networks
       - support for a new hardware family (Bz)

   - Xen pv driver:
       - harden netfront against malicious backends

   - Qualcomm mobile
       - ipa: refactor power management and enable automatic suspend
       - mhi: move MBIM to WWAN subsystem interfaces

  Refactor:

   - Ambient BPF run context and cgroup storage cleanup.

   - Compat rework for ndo_ioctl.

  Old code removal:

   - prism54 remove the obsoleted driver, deprecated by the p54 driver.

   - wan: remove sbni/granch driver"

* tag 'net-next-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1715 commits)
  net: Add depends on OF_NET for LiteX's LiteETH
  ipv6: seg6: remove duplicated include
  net: hns3: remove unnecessary spaces
  net: hns3: add some required spaces
  net: hns3: clean up a type mismatch warning
  net: hns3: refine function hns3_set_default_feature()
  ipv6: remove duplicated 'net/lwtunnel.h' include
  net: w5100: check return value after calling platform_get_resource()
  net/mlxbf_gige: Make use of devm_platform_ioremap_resourcexxx()
  net: mdio: mscc-miim: Make use of the helper function devm_platform_ioremap_resource()
  net: mdio-ipq4019: Make use of devm_platform_ioremap_resource()
  fou: remove sparse errors
  ipv4: fix endianness issue in inet_rtm_getroute_build_skb()
  octeontx2-af: Set proper errorcode for IPv4 checksum errors
  octeontx2-af: Fix static code analyzer reported issues
  octeontx2-af: Fix mailbox errors in nix_rss_flowkey_cfg
  octeontx2-af: Fix loop in free and unmap counter
  af_unix: fix potential NULL deref in unix_dgram_connect()
  dpaa2-eth: Replace strlcpy with strscpy
  octeontx2-af: Use NDC TX for transmit packet data
  ...
 2021-08-31 16:43:06 -07:00
Linus Torvalds
69dc8010b8 Merge branch 'for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 
Pull cgroup updates from Tejun Heo:
 "Two cpuset behavior changes:

   - cpuset on cgroup2 is changed to enable memory migration based on
     nodemask by default.

   - A notification is generated when cpuset partition state changes.

  All other patches are minor fixes and cleanups"

* 'for-5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: Avoid compiler warnings with no subsystems
  cgroup/cpuset: Avoid memory migration when nodemasks match
  cgroup/cpuset: Enable memory migration for cpuset v2
  cgroup/cpuset: Enable event notification when partition state changes
  cgroup: cgroup-v1: clean up kernel-doc notation
  cgroup: Replace deprecated CPU-hotplug functions.
  cgroup/cpuset: Fix violation of cpuset locking rule
  cgroup/cpuset: Fix a partition bug with hotplug
  cgroup/cpuset: Miscellaneous code cleanup
  cgroup: remove cgroup_mount from comments
 2021-08-31 15:49:04 -07:00
Linus Torvalds
efa916af13 - Add DM infrastructure for IMA-based remote attestion. These changes 
are the basis for deploying DM-based storage in a "cloud" that must
   validate configurations end-users run to maintain trust. These DM
   changes allow supported DM targets' configurations to be measured
   via IMA. But the policy and enforcement (of which configurations are
   valid) is managed by something outside the kernel (e.g. Keylime).
 
 - Fix DM crypt scalability regression on systems with many cpus due to
   percpu_counter spinlock contention in crypt_page_alloc().
 
 - Use in_hardirq() instead of deprecated in_irq() in DM crypt.
 
 - Add event counters to DM writecache to allow users to further assess
   how the writecache is performing.
 
 - Various code cleanup in DM writecache's main IO mapping function.
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Merge tag 'for-5.15/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper updates from Mike Snitzer:

 - Add DM infrastructure for IMA-based remote attestion. These changes
   are the basis for deploying DM-based storage in a "cloud" that must
   validate configurations end-users run to maintain trust. These DM
   changes allow supported DM targets' configurations to be measured via
   IMA. But the policy and enforcement (of which configurations are
   valid) is managed by something outside the kernel (e.g. Keylime).

 - Fix DM crypt scalability regression on systems with many cpus due to
   percpu_counter spinlock contention in crypt_page_alloc().

 - Use in_hardirq() instead of deprecated in_irq() in DM crypt.

 - Add event counters to DM writecache to allow users to further assess
   how the writecache is performing.

 - Various code cleanup in DM writecache's main IO mapping function.

* tag 'for-5.15/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm:
  dm crypt: use in_hardirq() instead of deprecated in_irq()
  dm ima: update dm documentation for ima measurement support
  dm ima: update dm target attributes for ima measurements
  dm ima: add a warning in dm_init if duplicate ima events are not measured
  dm ima: prefix ima event name related to device mapper with dm_
  dm ima: add version info to dm related events in ima log
  dm ima: prefix dm table hashes in ima log with hash algorithm
  dm crypt: Avoid percpu_counter spinlock contention in crypt_page_alloc()
  dm: add documentation for IMA measurement support
  dm: update target status functions to support IMA measurement
  dm ima: measure data on device rename
  dm ima: measure data on table clear
  dm ima: measure data on device remove
  dm ima: measure data on device resume
  dm ima: measure data on table load
  dm writecache: add event counters
  dm writecache: report invalid return from writecache_map helpers
  dm writecache: further writecache_map() cleanup
  dm writecache: factor out writecache_map_remap_origin()
  dm writecache: split up writecache_map() to improve code readability
 2021-08-31 14:55:09 -07:00
Catalin Marinas
65266a7c6a Merge remote-tracking branch 'tip/sched/arm64' into for-next/core 
* tip/sched/arm64: (785 commits)
  Documentation: arm64: describe asymmetric 32-bit support
  arm64: Remove logic to kill 32-bit tasks on 64-bit-only cores
  arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0
  arm64: Advertise CPUs capable of running 32-bit applications in sysfs
  arm64: Prevent offlining first CPU with 32-bit EL0 on mismatched system
  arm64: exec: Adjust affinity for compat tasks with mismatched 32-bit EL0
  arm64: Implement task_cpu_possible_mask()
  sched: Introduce dl_task_check_affinity() to check proposed affinity
  sched: Allow task CPU affinity to be restricted on asymmetric systems
  sched: Split the guts of sched_setaffinity() into a helper function
  sched: Introduce task_struct::user_cpus_ptr to track requested affinity
  sched: Reject CPU affinity changes based on task_cpu_possible_mask()
  cpuset: Cleanup cpuset_cpus_allowed_fallback() use in select_fallback_rq()
  cpuset: Honour task_cpu_possible_mask() in guarantee_online_cpus()
  cpuset: Don't use the cpu_possible_mask as a last resort for cgroup v1
  sched: Introduce task_cpu_possible_mask() to limit fallback rq selection
  sched: Cgroup SCHED_IDLE support
  sched/topology: Skip updating masks for non-online nodes
  Linux 5.14-rc6
  lib: use PFN_PHYS() in devmem_is_allowed()
  ...
 2021-08-31 09:10:00 +01:00
Linus Torvalds
bed9166741 A set of updates for the 86 reboot code: 
- Limit the Dell Optiplex 990 quirk to early BIOS versions to avoid the
     full 'power cycle' alike reboot which is required for the buggy BIOSes.
 
   - Update documentation for the reboot=pci command line option and
     document how DMI platform quirks can be overridden.
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Merge tag 'x86-misc-2021-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull misc x86 updates from Thomas Gleixner:
 "A set of updates for the x86 reboot code:

   - Limit the Dell Optiplex 990 quirk to early BIOS versions to avoid
     the full 'power cycle' alike reboot which is required for the buggy
     BIOSes.

   - Update documentation for the reboot=pci command line option and
     document how DMI platform quirks can be overridden"

* tag 'x86-misc-2021-08-30' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/reboot: Limit Dell Optiplex 990 quirk to early BIOS versions
  x86/reboot: Document how to override DMI platform quirks
  x86/reboot: Document the "reboot=pci" option
 2021-08-30 15:27:15 -07:00
Petr Mladek
baa99c9267 Merge branch 'for-5.15-verbose-console' into for-linus 2021-08-30 14:56:28 +02:00
Tushar Sugandhi
17bfa96851 dm ima: update dm documentation for ima measurement support 
The ima documentation for measuring DM targets (dm-ima.rst) is
missing the attribute information for the targets - 'cache', 'integrity',
'multipath', and 'snapshot'.  It is also missing the grammar for
various DM events and targets, which can help the attestation servers
to determine what data to expect for a given DM device.  Further,
the documentation needs to be updated to incorporate code changes
made to DM ima events and targets as part of this patch series.  For
instance, prefixing the event names with "dm_", adding the DM version to
events, prefixing the table hashes in the ima log with the
hash algorithm etc.  There are warnings reported by 'make htmldocs' on
dm-ima.rst, which need to be fixed.  And lastly, the expected behavior
needs to be documented when the configuration CONFIG_IMA_DISABLE_HTABLE
is disabled.

Update the documentation to add examples for 'cache', 'integrity',
'multipath', and 'snapshot' targets.  Add the grammar for
various DM events and targets in Backus Naur form,
so that the attestation servers can interpret and act on the ima
measurements for DM target.  Fix htmldocs warnings in dm-ima.rst.  Update
the documentation to be consistent with the code changes that are part of
this patch series.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Tushar Sugandhi <tusharsu@linux.microsoft.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
 2021-08-20 16:07:37 -04:00
Will Deacon
702f438726 Documentation: arm64: describe asymmetric 32-bit support 
Document support for running 32-bit tasks on asymmetric 32-bit systems
and its impact on the user ABI when enabled.

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210730112443.23245-17-will@kernel.org
 2021-08-20 12:33:07 +02:00
Will Deacon
ead7de462a arm64: Hook up cmdline parameter to allow mismatched 32-bit EL0 
Allow systems with mismatched 32-bit support at EL0 to run 32-bit
applications based on a new kernel parameter.

Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Link: https://lore.kernel.org/r/20210730112443.23245-15-will@kernel.org
 2021-08-20 12:33:07 +02:00
Matan Ziv-Av
ae26278829 platform/x86: lg-laptop: Use correct event for keyboard backlight FN-key 
Use led_classdev_notify_brightness_hw_changed() instead of F16 key.

Signed-off-by: Matan Ziv-Av <matan@svgalib.org>
Link: https://lore.kernel.org/r/2196990f167efe6a42d51fb85f4db4cdf4d9e80e.1629291912.git.matan@svgalib.org
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
 2021-08-20 12:09:42 +02:00
Matan Ziv-Av
85973bf4c1 platform/x86: lg-laptop: Use correct event for touchpad toggle FN-key 
Send F21 which is the standard for this key, instead of F13.

Signed-off-by: Matan Ziv-Av <matan@svgalib.org>
Link: https://lore.kernel.org/r/b847895c1f170e2e59df5757a4d603d28149f648.1629291912.git.matan@svgalib.org
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
 2021-08-20 12:09:41 +02:00
Lu Baolu
792fb43ce2 iommu/vt-d: Enable Intel IOMMU scalable mode by default 
The commit 8950dcd83a ("iommu/vt-d: Leave scalable mode default off")
leaves the scalable mode default off and end users could turn it on with
"intel_iommu=sm_on". Using the Intel IOMMU scalable mode for kernel DMA,
user-level device access and Shared Virtual Address have been enabled.
This enables the scalable mode by default if the hardware advertises the
support and adds kernel options of "intel_iommu=sm_on/sm_off" for end
users to configure it through the kernel parameters.

Suggested-by: Ashok Raj <ashok.raj@intel.com>
Suggested-by: Sanjay Kumar <sanjay.k.kumar@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Link: https://lore.kernel.org/r/20210720013856.4143880-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20210818134852.1847070-5-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
 2021-08-19 10:41:08 +02:00
Robin Murphy
e96763ec42 iommu: Merge strictness and domain type configs 
To parallel the sysfs behaviour, merge the new build-time option
for DMA domain strictness into the default domain type choice.

Suggested-by: Joerg Roedel <joro@8bytes.org>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: John Garry <john.garry@huawei.com>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/d04af35b9c0f2a1d39605d7a9b451f5e1f0c7736.1628682049.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
 2021-08-18 13:27:49 +02:00
Waiman Long
ee9707e859 cgroup/cpuset: Enable memory migration for cpuset v2 
When a user changes cpuset.cpus, each task in a v2 cpuset will be moved
to one of the new cpus if it is not there already. For memory, however,
they won't be migrated to the new nodes when cpuset.mems changes. This is
an inconsistency in behavior.

In cpuset v1, there is a memory_migrate control file to enable such
behavior by setting the CS_MEMORY_MIGRATE flag. Make it the default
for cpuset v2 so that we have a consistent set of behavior for both
cpus and memory.

There is certainly a cost to make memory migration the default, but it
is a one time cost that shouldn't really matter as long as cpuset.mems
isn't changed frequenty.  Update the cgroup-v2.rst file to document the
new behavior and recommend against changing cpuset.mems frequently.

Since there won't be any concurrent access to the newly allocated cpuset
structure in cpuset_css_alloc(), we can use the cheaper non-atomic
__set_bit() instead of the more expensive atomic set_bit().

Signed-off-by: Waiman Long <longman@redhat.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
 2021-08-12 11:40:20 -10:00
Paul Gortmaker
12febc1818 x86/reboot: Document how to override DMI platform quirks 
commit 5955633e91 ("x86/reboot: Skip DMI checks if reboot set by user")
made it so that it's not required to recompile the kernel in order to
bypass broken reboot quirks compiled into an image:

 * This variable is used privately to keep track of whether or not
 * reboot_type is still set to its default value (i.e., reboot= hasn't
 * been set on the command line).  This is needed so that we can
 * suppress DMI scanning for reboot quirks.  Without it, it's
 * impossible to override a faulty reboot quirk without recompiling.

However, at the time it was not eally documented outside the source code,
and so this information isn't really available to the average user out
there.

The change is a little white lie and invented "reboot=default" since it is
easy to remember, and documents well.  The truth is that any random string
that is *not* a currently accepted string will work.

Since that doesn't document well for non-coders, and since it's unknown
what the future additions might be, lay claim on "default" since that is
exactly what it achieves.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210530162447.996461-3-paul.gortmaker@windriver.com
 2021-08-12 12:06:58 +02:00
Tushar Sugandhi
00d43995f0 dm: add documentation for IMA measurement support 
To interpret various DM target measurement data in IMA logs,
a separate documentation page is needed under
Documentation/admin-guide/device-mapper.

Add documentation to help system administrators and attestation
client/server component owners to interpret the measurement
data generated by various DM targets, on various device/table state
changes.

Signed-off-by: Tushar Sugandhi <tusharsu@linux.microsoft.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
 2021-08-10 13:34:23 -04:00
Mikulas Patocka
e3a35d0340 dm writecache: add event counters 
Add 10 counters for various events (hit, miss, etc) and export them in
the status line (accessed from userspace with "dmsetup status"). Also
add a message "clear_stats" that resets these counters.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
 2021-08-10 13:27:49 -04:00
Yee Lee
7a062ce318 arm64/cpufeature: Optionally disable MTE via command-line 
MTE support needs to be optionally disabled in runtime
for HW issue workaround, FW development and some
evaluation works on system resource and performance.

This patch makes two changes:
(1) moves init of tag-allocation bits(ATA/ATA0) to
cpu_enable_mte() as not cached in TLB.

(2) allows ID_AA64PFR1_EL1.MTE to be overridden on
its shadow value by giving "arm64.nomte" on cmdline.

When the feature value is off, ATA and TCF will not set
and the related functionalities are accordingly suppressed.

Suggested-by: Catalin Marinas <catalin.marinas@arm.com>
Suggested-by: Marc Zyngier <maz@kernel.org>
Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Yee Lee <yee.lee@mediatek.com>
Link: https://lore.kernel.org/r/20210803070824.7586-2-yee.lee@mediatek.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
 2021-08-03 15:48:01 +01:00
Arnd Bergmann
72bcad5393 wan: remove sbni/granch driver 
The driver was merged in 1999 and has only ever seen treewide cleanups
since then, with no indication whatsoever that anyone has actually
had access to hardware for testing the patches.

>From the information in the link below, it appears that the hardware
is for some leased line system in Russia that has since been
discontinued, and useless without any remote end to connect to.

As the driver still feels like a Linux-2.2 era artifact today, it
appears that the best way forward is to just delete it.

Link: https://www.tms.ru/%D0%90%D0%B4%D0%B0%D0%BF%D1%82%D0%B5%D1%80_%D0%B4%D0%BB%D1%8F_%D0%B2%D1%8B%D0%B4%D0%B5%D0%BB%D0%B5%D0%BD%D0%BD%D1%8B%D1%85_%D0%BB%D0%B8%D0%BD%D0%B8%D0%B9_Granch_SBNI12-10
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
 2021-08-03 13:05:26 +01:00
Leon Romanovsky
8d7e415d55 docs: Fix infiniband uverbs minor number 
Starting from the beginning of infiniband subsystem, the uverbs char
devices start from 192 as a minor number, see
commit bc38a6abdd ("[PATCH] IB uverbs: core implementation").

This patch updates the admin guide documentation to reflect it.

Fixes: 9d85025b04 ("docs-rst: create an user's manual book")
Link: https://lore.kernel.org/r/bad03e6bcde45550c01e12908a6fe7dfa4770703.1627477347.git.leonro@nvidia.com
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
 2021-07-30 10:05:50 -03:00
Dmitry Safonov
10102a890b printk: Add printk.console_no_auto_verbose boot parameter 
console_verbose() increases console loglevel to
CONSOLE_LOGLEVEL_MOTORMOUTH, which provides more information
to debug a panic/oops.

Unfortunately, in Arista we maintain some DUTs (Device Under Test) that
are configured to have 9600 baud rate. While verbose console messages
have their value to post-analyze crashes, on such setup they:
- may prevent panic/oops messages being printed
- take too long to flush on console resulting in watchdog reboot

In all our setups we use kdump which saves dmesg buffer after panic,
so in reality those extra messages on console provide no additional value,
but rather add risk of not getting to __crash_kexec().

Provide printk.console_no_auto_verbose boot parameter, which allows
to switch off printk being verbose on oops/panic/lockdep.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Dmitry Safonov <dima@arista.com>
Suggested-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Tested-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20210727130635.675184-3-dima@arista.com
 2021-07-29 16:29:35 +02:00
Dave Jiang
ade8a86b51 dmaengine: idxd: Set defaults for GRPCFG traffic class 
Set GRPCFG traffic class to value of 1 for best performance on current
generation of accelerators. Also add override option to allow experimentation.
Sysfs knobs are disabled for DSA/IAX gen1 devices.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/162681373005.1968485.3761065664382799202.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
 2021-07-28 17:55:40 +05:30
Balbir Singh
b7fe54f6c2 Documentation: Add L1D flushing Documentation 
Add documentation of l1d flushing, explain the need for the
feature and how it can be used.

Signed-off-by: Balbir Singh <sblbir@amazon.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210108121056.21940-6-sblbir@amazon.com
 2021-07-28 11:42:25 +02:00
Zhen Lei
712d8f2058 iommu: Enhance IOMMU default DMA mode build options 
First, add build options IOMMU_DEFAULT_{LAZY|STRICT}, so that we have the
opportunity to set {lazy|strict} mode as default at build time. Then put
the two config options in an choice, as they are mutually exclusive.

[jpg: Make choice between strict and lazy only (and not passthrough)]

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/1626088340-5838-4-git-send-email-john.garry@huawei.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
 2021-07-26 13:27:38 +02:00
John Garry
1d479f160c iommu: Deprecate Intel and AMD cmdline methods to enable strict mode 
Now that the x86 drivers support iommu.strict, deprecate the custom
methods.

Signed-off-by: John Garry <john.garry@huawei.com>
Acked-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/1626088340-5838-2-git-send-email-john.garry@huawei.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
 2021-07-26 13:27:38 +02:00
Yang Xu
d5caec394a admin-guide/cputopology.rst: Remove non-existed cpu-hotplug.txt 
Since kernel commit ff58fa7f55 ("Documentation: Update CPU hotplug and move it to core-api"),
cpu_hotplug.txt has been removed. We should update it in here.

Signed-off-by: Yang Xu <xuyang2018.jy@fujitsu.com>
Link: https://lore.kernel.org/r/1624412269-13155-1-git-send-email-xuyang2018.jy@fujitsu.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-07-25 14:42:48 -06:00
Fabio M. De Francesco
ce48ee81a1 admin-guide/hw-vuln: Rephrase a section of core-scheduling.rst 
Rephrase the "For MDS" section in core-scheduling.rst for the purpose of
making it clearer what is meant by "kernel memory is still considered
untrusted".

Suggested-by: Vineeth Pillai <Vineeth.Pillai@microsoft.com>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Reviewed-by: Joel Fernandes (Google) <joelaf@google.com>
Link: https://lore.kernel.org/r/20210721190250.26095-1-fmdefrancesco@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-07-25 14:39:17 -06:00
Carlos Llamas
06e1721d2a docs: binderfs: add section about feature files 
Document how binder feature files can be used to determine whether a
feature is supported by the binder driver. "oneway_spam_detection" is
used as an example as it is the first available feature file.

Acked-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20210715031805.1725878-2-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2021-07-21 13:46:36 +02:00
Cengiz Can
f1285c68e1 Documentation: sysrq: convert to third person 
Two parts of the sysrq documentation have sentences written from a first
person's point of view.

Documentation is generally written from a third person's view in a
formal way.

Convert those senteces to be less personal and generic.

Signed-off-by: Cengiz Can <cengiz@kernel.wtf>
Link: https://lore.kernel.org/r/20210629141508.52229-1-cengiz@kernel.wtf
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-07-15 06:33:44 -06:00
Linus Torvalds
79160a603b USB / Thunderbolt patches for 5.14-rc1 
Here is the big set of USB and Thunderbolt patches for 5.14-rc1.
 
 Nothing major here just lots of little changes for new hardware and
 features.  Highlights are:
 	- more USB 4 support added to the thunderbolt core
 	- build warning fixes all over the place
 	- usb-serial driver updates and new device support
 	- mtu3 driver updates
 	- gadget driver updates
 	- dwc3 driver updates
 	- dwc2 driver updates
 	- isp1760 host driver updates
 	- musb driver updates
 	- lots of other tiny things.
 
 Full details are in the shortlog.
 
 All of these have been in linux-next for a while now with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb

Pull USB / Thunderbolt updates from Greg KH:
 "Here is the big set of USB and Thunderbolt patches for 5.14-rc1.

  Nothing major here just lots of little changes for new hardware and
  features. Highlights are:

   - more USB 4 support added to the thunderbolt core

   - build warning fixes all over the place

   - usb-serial driver updates and new device support

   - mtu3 driver updates

   - gadget driver updates

   - dwc3 driver updates

   - dwc2 driver updates

   - isp1760 host driver updates

   - musb driver updates

   - lots of other tiny things.

  Full details are in the shortlog.

  All of these have been in linux-next for a while now with no reported
  issues"

* tag 'usb-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb: (223 commits)
  phy: qcom-qusb2: Add configuration for SM4250 and SM6115
  dt-bindings: phy: qcom,qusb2: document sm4250/6115 compatible
  dt-bindings: usb: qcom,dwc3: Add bindings for sm6115/4250
  USB: cdc-acm: blacklist Heimann USB Appset device
  usb: xhci-mtk: allow multiple Start-Split in a microframe
  usb: ftdi-elan: remove redundant continue statement in a while-loop
  usb: class: cdc-wdm: return the correct errno code
  xhci: remove redundant continue statement
  usb: dwc3: Fix debugfs creation flow
  usb: gadget: hid: fix error return code in hid_bind()
  usb: gadget: eem: fix echo command packet response issue
  usb: gadget: f_hid: fix endianness issue with descriptors
  Revert "USB: misc: Add onboard_usb_hub driver"
  Revert "of/platform: Add stubs for of_platform_device_create/destroy()"
  Revert "usb: host: xhci-plat: Create platform device for onboard hubs in probe()"
  Revert "arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub"
  xhci: solve a double free problem while doing s4
  xhci: handle failed buffer copy to URB sg list and fix a W=1 copiler warning
  xhci: Add adaptive interrupt rate for isoch TRBs with XHCI_AVOID_BEI quirk
  xhci: Remove unused defines for ERST_SIZE and ERST_ENTRIES
  ...
 2021-07-05 14:16:22 -07:00
Linus Torvalds
c932ed0adb TTY / Serial patches for 5.14-rc1 
Here is the big set of tty and serial driver patches for 5.14-rc1.
 
 A bit more than normal, but nothing major, lots of cleanups.  Highlights
 are:
 	- lots of tty api cleanups and mxser driver cleanups from Jiri
 	- build warning fixes
 	- various serial driver updates
 	- coding style cleanups
 	- various tty driver minor fixes and updates
 	- removal of broken and disable r3964 line discipline (finally!)
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty / serial updates from Greg KH:
 "Here is the big set of tty and serial driver patches for 5.14-rc1.

  A bit more than normal, but nothing major, lots of cleanups.
  Highlights are:

   - lots of tty api cleanups and mxser driver cleanups from Jiri

   - build warning fixes

   - various serial driver updates

   - coding style cleanups

   - various tty driver minor fixes and updates

   - removal of broken and disable r3964 line discipline (finally!)

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'tty-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (227 commits)
  serial: mvebu-uart: remove unused member nb from struct mvebu_uart
  arm64: dts: marvell: armada-37xx: Fix reg for standard variant of UART
  dt-bindings: mvebu-uart: fix documentation
  serial: mvebu-uart: correctly calculate minimal possible baudrate
  serial: mvebu-uart: do not allow changing baudrate when uartclk is not available
  serial: mvebu-uart: fix calculation of clock divisor
  tty: make linux/tty_flip.h self-contained
  serial: Prefer unsigned int to bare use of unsigned
  serial: 8250: 8250_omap: Fix possible interrupt storm on K3 SoCs
  serial: qcom_geni_serial: use DT aliases according to DT bindings
  Revert "tty: serial: Add UART driver for Cortina-Access platform"
  tty: serial: Add UART driver for Cortina-Access platform
  MAINTAINERS: add me back as mxser maintainer
  mxser: Documentation, fix typos
  mxser: Documentation, make the docs up-to-date
  mxser: Documentation, remove traces of callout device
  mxser: introduce mxser_16550A_or_MUST helper
  mxser: rename flags to old_speed in mxser_set_serial_info
  mxser: use port variable in mxser_set_serial_info
  mxser: access info->MCR under info->slock
  ...
 2021-07-05 14:08:24 -07:00
Linus Torvalds
28e92f9903 Merge branch 'core-rcu-2021.07.04' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu 
Pull RCU updates from Paul McKenney:

 - Bitmap parsing support for "all" as an alias for all bits

 - Documentation updates

 - Miscellaneous fixes, including some that overlap into mm and lockdep

 - kvfree_rcu() updates

 - mem_dump_obj() updates, with acks from one of the slab-allocator
   maintainers

 - RCU NOCB CPU updates, including limited deoffloading

 - SRCU updates

 - Tasks-RCU updates

 - Torture-test updates

* 'core-rcu-2021.07.04' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (78 commits)
  tasks-rcu: Make show_rcu_tasks_gp_kthreads() be static inline
  rcu-tasks: Make ksoftirqd provide RCU Tasks quiescent states
  rcu: Add missing __releases() annotation
  rcu: Remove obsolete rcu_read_unlock() deadlock commentary
  rcu: Improve comments describing RCU read-side critical sections
  rcu: Create an unrcu_pointer() to remove __rcu from a pointer
  srcu: Early test SRCU polling start
  rcu: Fix various typos in comments
  rcu/nocb: Unify timers
  rcu/nocb: Prepare for fine-grained deferred wakeup
  rcu/nocb: Only cancel nocb timer if not polling
  rcu/nocb: Delete bypass_timer upon nocb_gp wakeup
  rcu/nocb: Cancel nocb_timer upon nocb_gp wakeup
  rcu/nocb: Allow de-offloading rdp leader
  rcu/nocb: Directly call __wake_nocb_gp() from bypass timer
  rcu: Don't penalize priority boosting when there is nothing to boost
  rcu: Point to documentation of ordering guarantees
  rcu: Make rcu_gp_cleanup() be noinline for tracing
  rcu: Restrict RCU_STRICT_GRACE_PERIOD to at most four CPUs
  rcu: Make show_rcu_gp_kthreads() dump rcu_node structures blocking GP
  ...
 2021-07-04 12:58:33 -07:00
Linus Torvalds
757fa80f4e Tracing updates for 5.14: 
- Added option for per CPU threads to the hwlat tracer
 
  - Have hwlat tracer handle hotplug CPUs
 
  - New tracer: osnoise, that detects latency caused by interrupts, softirqs
    and scheduling of other tasks.
 
  - Added timerlat tracer that creates a thread and measures in detail what
    sources of latency it has for wake ups.
 
  - Removed the "success" field of the sched_wakeup trace event.
    This has been hardcoded as "1" since 2015, no tooling should be looking
    at it now. If one exists, we can revert this commit, fix that tool and
    try to remove it again in the future.
 
  - tgid mapping fixed to handle more than PID_MAX_DEFAULT pids/tgids.
 
  - New boot command line option "tp_printk_stop", as tp_printk causes trace
    events to write to console. When user space starts, this can easily live
    lock the system. Having a boot option to stop just after boot up is
    useful to prevent that from happening.
 
  - Have ftrace_dump_on_oops boot command line option take numbers that match
    the numbers shown in /proc/sys/kernel/ftrace_dump_on_oops.
 
  - Bootconfig clean ups, fixes and enhancements.
 
  - New ktest script that tests bootconfig options.
 
  - Add tracepoint_probe_register_may_exist() to register a tracepoint
    without triggering a WARN*() if it already exists. BPF has a path from
    user space that can do this. All other paths are considered a bug.
 
  - Small clean ups and fixes
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Merge tag 'trace-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

Pull tracing updates from Steven Rostedt:

 - Added option for per CPU threads to the hwlat tracer

 - Have hwlat tracer handle hotplug CPUs

 - New tracer: osnoise, that detects latency caused by interrupts,
   softirqs and scheduling of other tasks.

 - Added timerlat tracer that creates a thread and measures in detail
   what sources of latency it has for wake ups.

 - Removed the "success" field of the sched_wakeup trace event. This has
   been hardcoded as "1" since 2015, no tooling should be looking at it
   now. If one exists, we can revert this commit, fix that tool and try
   to remove it again in the future.

 - tgid mapping fixed to handle more than PID_MAX_DEFAULT pids/tgids.

 - New boot command line option "tp_printk_stop", as tp_printk causes
   trace events to write to console. When user space starts, this can
   easily live lock the system. Having a boot option to stop just after
   boot up is useful to prevent that from happening.

 - Have ftrace_dump_on_oops boot command line option take numbers that
   match the numbers shown in /proc/sys/kernel/ftrace_dump_on_oops.

 - Bootconfig clean ups, fixes and enhancements.

 - New ktest script that tests bootconfig options.

 - Add tracepoint_probe_register_may_exist() to register a tracepoint
   without triggering a WARN*() if it already exists. BPF has a path
   from user space that can do this. All other paths are considered a
   bug.

 - Small clean ups and fixes

* tag 'trace-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (49 commits)
  tracing: Resize tgid_map to pid_max, not PID_MAX_DEFAULT
  tracing: Simplify & fix saved_tgids logic
  treewide: Add missing semicolons to __assign_str uses
  tracing: Change variable type as bool for clean-up
  trace/timerlat: Fix indentation on timerlat_main()
  trace/osnoise: Make 'noise' variable s64 in run_osnoise()
  tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing
  tracing: Fix spelling in osnoise tracer "interferences" -> "interference"
  Documentation: Fix a typo on trace/osnoise-tracer
  trace/osnoise: Fix return value on osnoise_init_hotplug_support
  trace/osnoise: Make interval u64 on osnoise_main
  trace/osnoise: Fix 'no previous prototype' warnings
  tracing: Have osnoise_main() add a quiescent state for task rcu
  seq_buf: Make trace_seq_putmem_hex() support data longer than 8
  seq_buf: Fix overflow in seq_buf_putmem_hex()
  trace/osnoise: Support hotplug operations
  trace/hwlat: Support hotplug operations
  trace/hwlat: Protect kdata->kthread with get/put_online_cpus
  trace: Add timerlat tracer
  trace: Add osnoise tracer
  ...
 2021-07-03 11:13:22 -07:00
Linus Torvalds
cd3eb7efaa IOMMU Updates for Linux v5.14 
Including:
 
  - SMMU Updates from Will Deacon:
 
      - SMMUv3: Support stalling faults for platform devices
      - SMMUv3: Decrease defaults sizes for the event and PRI queues
      - SMMUv2: Support for a new '->probe_finalize' hook, needed by Nvidia
      - SMMUv2: Even more Qualcomm compatible strings
      - SMMUv2: Avoid Adreno TTBR1 quirk for DB820C platform
 
  - Intel VT-d updates from Lu Baolu:
 
      - Convert Intel IOMMU to use sva_lib helpers in iommu core
      - ftrace and debugfs supports for page fault handling
      - Support asynchronous nested capabilities
      - Various misc cleanups
 
  - Support for new VIOT ACPI table to make the VirtIO IOMMU:
    available on x86
 
  - Add the amd_iommu=force_enable command line option to
    enable the IOMMU on platforms where they are known to cause
    problems
 
  - Support for version 2 of the Rockchip IOMMU
 
  - Various smaller fixes, cleanups and refactorings
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Merge tag 'iommu-updates-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu updates from Joerg Roedel:

 - SMMU Updates from Will Deacon:

     - SMMUv3:
        - Support stalling faults for platform devices
        - Decrease defaults sizes for the event and PRI queues
     - SMMUv2:
        - Support for a new '->probe_finalize' hook, needed by Nvidia
        - Even more Qualcomm compatible strings
        - Avoid Adreno TTBR1 quirk for DB820C platform

 - Intel VT-d updates from Lu Baolu:

     - Convert Intel IOMMU to use sva_lib helpers in iommu core
     - ftrace and debugfs supports for page fault handling
     - Support asynchronous nested capabilities
     - Various misc cleanups

 - Support for new VIOT ACPI table to make the VirtIO IOMMU
   available on x86

 - Add the amd_iommu=force_enable command line option to enable
   the IOMMU on platforms where they are known to cause problems

 - Support for version 2 of the Rockchip IOMMU

 - Various smaller fixes, cleanups and refactorings

* tag 'iommu-updates-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (66 commits)
  iommu/virtio: Enable x86 support
  iommu/dma: Pass address limit rather than size to iommu_setup_dma_ops()
  ACPI: Add driver for the VIOT table
  ACPI: Move IOMMU setup code out of IORT
  ACPI: arm64: Move DMA setup operations out of IORT
  iommu/vt-d: Fix dereference of pointer info before it is null checked
  iommu: Update "iommu.strict" documentation
  iommu/arm-smmu: Check smmu->impl pointer before dereferencing
  iommu/arm-smmu-v3: Remove unnecessary oom message
  iommu/arm-smmu: Fix arm_smmu_device refcount leak in address translation
  iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails
  iommu/vt-d: Fix linker error on 32-bit
  iommu/vt-d: No need to typecast
  iommu/vt-d: Define counter explicitly as unsigned int
  iommu/vt-d: Remove unnecessary braces
  iommu/vt-d: Removed unused iommu_count in dmar domain
  iommu/vt-d: Use bitfields for DMAR capabilities
  iommu/vt-d: Use DEVICE_ATTR_RO macro
  iommu/vt-d: Fix out-bounds-warning in intel/svm.c
  iommu/vt-d: Add PRQ handling latency sampling
  ...
 2021-07-02 13:22:47 -07:00
Linus Torvalds
71bd934101 Merge branch 'akpm' (patches from Andrew) 
Merge more updates from Andrew Morton:
 "190 patches.

  Subsystems affected by this patch series: mm (hugetlb, userfaultfd,
  vmscan, kconfig, proc, z3fold, zbud, ras, mempolicy, memblock,
  migration, thp, nommu, kconfig, madvise, memory-hotplug, zswap,
  zsmalloc, zram, cleanups, kfence, and hmm), procfs, sysctl, misc,
  core-kernel, lib, lz4, checkpatch, init, kprobes, nilfs2, hfs,
  signals, exec, kcov, selftests, compress/decompress, and ipc"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (190 commits)
  ipc/util.c: use binary search for max_idx
  ipc/sem.c: use READ_ONCE()/WRITE_ONCE() for use_global_lock
  ipc: use kmalloc for msg_queue and shmid_kernel
  ipc sem: use kvmalloc for sem_undo allocation
  lib/decompressors: remove set but not used variabled 'level'
  selftests/vm/pkeys: exercise x86 XSAVE init state
  selftests/vm/pkeys: refill shadow register after implicit kernel write
  selftests/vm/pkeys: handle negative sys_pkey_alloc() return code
  selftests/vm/pkeys: fix alloc_random_pkey() to make it really, really random
  kcov: add __no_sanitize_coverage to fix noinstr for all architectures
  exec: remove checks in __register_bimfmt()
  x86: signal: don't do sas_ss_reset() until we are certain that sigframe won't be abandoned
  hfsplus: report create_date to kstat.btime
  hfsplus: remove unnecessary oom message
  nilfs2: remove redundant continue statement in a while-loop
  kprobes: remove duplicated strong free_insn_page in x86 and s390
  init: print out unknown kernel parameters
  checkpatch: do not complain about positive return values starting with EPOLL
  checkpatch: improve the indented label test
  checkpatch: scripts/spdxcheck.py now requires python3
  ...
 2021-07-02 12:08:10 -07:00
Linus Torvalds
3dbdb38e28 Merge branch 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 
Pull cgroup updates from Tejun Heo:

 - cgroup.kill is added which implements atomic killing of the whole
   subtree.

   Down the line, this should be able to replace the multiple userland
   implementations of "keep killing till empty".

 - PSI can now be turned off at boot time to avoid overhead for
   configurations which don't care about PSI.

* 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: make per-cgroup pressure stall tracking configurable
  cgroup: Fix kernel-doc
  cgroup: inline cgroup_task_freeze()
  tests/cgroup: test cgroup.kill
  tests/cgroup: move cg_wait_for(), cg_prepare_for_wait()
  tests/cgroup: use cgroup.kill in cg_killall()
  docs/cgroup: add entry for cgroup.kill
  cgroup: introduce cgroup.kill
 2021-07-01 17:22:14 -07:00
Axel Rasmussen
964ab0040f userfaultfd/shmem: advertise shmem minor fault support 
Now that the feature is fully implemented (the faulting path hooks exist
so userspace is notified, and the ioctl to resolve such faults is
available), advertise this as a supported feature.

Link: https://lkml.kernel.org/r/20210503180737.2487560-6-axelrasmussen@google.com
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: Peter Xu <peterx@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Brian Geffon <bgeffon@google.com>
Cc: "Dr . David Alan Gilbert" <dgilbert@redhat.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Oliver Upton <oupton@google.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Wang Qing <wangqing@vivo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-30 20:47:27 -07:00
Peter Xu
fb8e37f35a mm/pagemap: export uffd-wp protection information 
Export the PTE/PMD status of uffd-wp to pagemap too.

Link: https://lkml.kernel.org/r/20210428225030.9708-6-peterx@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Brian Geffon <bgeffon@google.com>
Cc: "Dr . David Alan Gilbert" <dgilbert@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Oliver Upton <oupton@google.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Wang Qing <wangqing@vivo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-30 20:47:27 -07:00
Muchun Song
e6d41f12df mm: hugetlb: introduce CONFIG_HUGETLB_PAGE_FREE_VMEMMAP_DEFAULT_ON 
When using HUGETLB_PAGE_FREE_VMEMMAP, the freeing unused vmemmap pages
associated with each HugeTLB page is default off.  Now the vmemmap is PMD
mapped.  So there is no side effect when this feature is enabled with no
HugeTLB pages in the system.  Someone may want to enable this feature in
the compiler time instead of using boot command line.  So add a config to
make it default on when someone do not want to enable it via command line.

Link: https://lkml.kernel.org/r/20210616094915.34432-4-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Cc: Chen Huang <chenhuang5@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-30 20:47:26 -07:00
Muchun Song
2d7a21715f mm: sparsemem: use huge PMD mapping for vmemmap pages 
The preparation of splitting huge PMD mapping of vmemmap pages is ready,
so switch the mapping from PTE to PMD.

Link: https://lkml.kernel.org/r/20210616094915.34432-3-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Chen Huang <chenhuang5@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-30 20:47:26 -07:00
Muchun Song
4bab4964a5 mm: memory_hotplug: disable memmap_on_memory when hugetlb_free_vmemmap enabled 
The parameter of memory_hotplug.memmap_on_memory is not compatible with
hugetlb_free_vmemmap.  So disable it when hugetlb_free_vmemmap is enabled.

[akpm@linux-foundation.org: remove unneeded include, per Oscar]

Link: https://lkml.kernel.org/r/20210510030027.56044-9-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Barry Song <song.bao.hua@hisilicon.com>
Cc: Bodeddula Balasubramaniam <bodeddub@amazon.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Chen Huang <chenhuang5@huawei.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: HORIGUCHI NAOYA <naoya.horiguchi@nec.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Oliver Neukum <oneukum@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-30 20:47:25 -07:00
Muchun Song
e9fdff87e8 mm: hugetlb: add a kernel parameter hugetlb_free_vmemmap 
Add a kernel parameter hugetlb_free_vmemmap to enable the feature of
freeing unused vmemmap pages associated with each hugetlb page on boot.

We disable PMD mapping of vmemmap pages for x86-64 arch when this feature
is enabled.  Because vmemmap_remap_free() depends on vmemmap being base
page mapped.

Link: https://lkml.kernel.org/r/20210510030027.56044-8-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Barry Song <song.bao.hua@hisilicon.com>
Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>
Tested-by: Chen Huang <chenhuang5@huawei.com>
Tested-by: Bodeddula Balasubramaniam <bodeddub@amazon.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: HORIGUCHI NAOYA <naoya.horiguchi@nec.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Oliver Neukum <oneukum@suse.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-30 20:47:25 -07:00
Muchun Song
ad2fa3717b mm: hugetlb: alloc the vmemmap pages associated with each HugeTLB page 
When we free a HugeTLB page to the buddy allocator, we need to allocate
the vmemmap pages associated with it.  However, we may not be able to
allocate the vmemmap pages when the system is under memory pressure.  In
this case, we just refuse to free the HugeTLB page.  This changes behavior
in some corner cases as listed below:

 1) Failing to free a huge page triggered by the user (decrease nr_pages).

    User needs to try again later.

 2) Failing to free a surplus huge page when freed by the application.

    Try again later when freeing a huge page next time.

 3) Failing to dissolve a free huge page on ZONE_MOVABLE via
    offline_pages().

    This can happen when we have plenty of ZONE_MOVABLE memory, but
    not enough kernel memory to allocate vmemmmap pages.  We may even
    be able to migrate huge page contents, but will not be able to
    dissolve the source huge page.  This will prevent an offline
    operation and is unfortunate as memory offlining is expected to
    succeed on movable zones.  Users that depend on memory hotplug
    to succeed for movable zones should carefully consider whether the
    memory savings gained from this feature are worth the risk of
    possibly not being able to offline memory in certain situations.

 4) Failing to dissolve a huge page on CMA/ZONE_MOVABLE via
    alloc_contig_range() - once we have that handling in place. Mainly
    affects CMA and virtio-mem.

    Similar to 3). virito-mem will handle migration errors gracefully.
    CMA might be able to fallback on other free areas within the CMA
    region.

Vmemmap pages are allocated from the page freeing context.  In order for
those allocations to be not disruptive (e.g.  trigger oom killer)
__GFP_NORETRY is used.  hugetlb_lock is dropped for the allocation because
a non sleeping allocation would be too fragile and it could fail too
easily under memory pressure.  GFP_ATOMIC or other modes to access memory
reserves is not used because we want to prevent consuming reserves under
heavy hugetlb freeing.

[mike.kravetz@oracle.com: fix dissolve_free_huge_page use of tail/head page]
  Link: https://lkml.kernel.org/r/20210527231225.226987-1-mike.kravetz@oracle.com
[willy@infradead.org: fix alloc_vmemmap_page_list documentation warning]
  Link: https://lkml.kernel.org/r/20210615200242.1716568-6-willy@infradead.org

Link: https://lkml.kernel.org/r/20210510030027.56044-7-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Balbir Singh <bsingharora@gmail.com>
Cc: Barry Song <song.bao.hua@hisilicon.com>
Cc: Bodeddula Balasubramaniam <bodeddub@amazon.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Chen Huang <chenhuang5@huawei.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: HORIGUCHI NAOYA <naoya.horiguchi@nec.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Oliver Neukum <oneukum@suse.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-30 20:47:25 -07:00
Linus Torvalds
2cfa582be8 - Various DM persistent-data library improvements and fixes that 
benefit both the DM thinp and cache targets.
 
 - A few small DM kcopyd efficiency improvements.
 
 - Significant zoned related block core, DM core and DM zoned target
   changes that culminate with adding zoned append emulation (which is
   required to properly fix DM crypt's zoned support).
 
 - Various DM writecache target changes that improve efficiency. Adds
   an optional "metadata_only" feature that only promotes bios flagged
   with REQ_META. But the most significant improvement is writecache's
   ability to pause writeback, for a confiurable time, if/when the
   working set is larger than the cache (and the cache is full) -- this
   ensures performance is no worse than the slower origin device.
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Merge tag 'for-5.14/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm

Pull device mapper updates from Mike Snitzer:

 - Various DM persistent-data library improvements and fixes that
   benefit both the DM thinp and cache targets.

 - A few small DM kcopyd efficiency improvements.

 - Significant zoned related block core, DM core and DM zoned target
   changes that culminate with adding zoned append emulation (which is
   required to properly fix DM crypt's zoned support).

 - Various DM writecache target changes that improve efficiency. Adds an
   optional "metadata_only" feature that only promotes bios flagged with
   REQ_META. But the most significant improvement is writecache's
   ability to pause writeback, for a confiurable time, if/when the
   working set is larger than the cache (and the cache is full) -- this
   ensures performance is no worse than the slower origin device.

* tag 'for-5.14/dm-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm: (35 commits)
  dm writecache: make writeback pause configurable
  dm writecache: pause writeback if cache full and origin being written directly
  dm io tracker: factor out IO tracker
  dm btree remove: assign new_root only when removal succeeds
  dm zone: fix dm_revalidate_zones() memory allocation
  dm ps io affinity: remove redundant continue statement
  dm writecache: add optional "metadata_only" parameter
  dm writecache: add "cleaner" and "max_age" to Documentation
  dm writecache: write at least 4k when committing
  dm writecache: flush origin device when writing and cache is full
  dm writecache: have ssd writeback wait if the kcopyd workqueue is busy
  dm writecache: use list_move instead of list_del/list_add in writecache_writeback()
  dm writecache: commit just one block, not a full page
  dm writecache: remove unused gfp_t argument from wc_add_block()
  dm crypt: Fix zoned block device support
  dm: introduce zone append emulation
  dm: rearrange core declarations for extended use from dm-zone.c
  block: introduce BIO_ZONE_WRITE_LOCKED bio flag
  block: introduce bio zone helpers
  block: improve handling of all zones reset operation
  ...
 2021-06-30 18:19:39 -07:00
Linus Torvalds
df668a5fe4 for-5.14/block-2021-06-29 
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Merge tag 'for-5.14/block-2021-06-29' of git://git.kernel.dk/linux-block

Pull core block updates from Jens Axboe:

 - disk events cleanup (Christoph)

 - gendisk and request queue allocation simplifications (Christoph)

 - bdev_disk_changed cleanups (Christoph)

 - IO priority improvements (Bart)

 - Chained bio completion trace fix (Edward)

 - blk-wbt fixes (Jan)

 - blk-wbt enable/disable fix (Zhang)

 - Scheduler dispatch improvements (Jan, Ming)

 - Shared tagset scheduler improvements (John)

 - BFQ updates (Paolo, Luca, Pietro)

 - BFQ lock inversion fix (Jan)

 - Documentation improvements (Kir)

 - CLONE_IO block cgroup fix (Tejun)

 - Remove of ancient and deprecated block dump feature (zhangyi)

 - Discard merge fix (Ming)

 - Misc fixes or followup fixes (Colin, Damien, Dan, Long, Max, Thomas,
   Yang)

* tag 'for-5.14/block-2021-06-29' of git://git.kernel.dk/linux-block: (129 commits)
  block: fix discard request merge
  block/mq-deadline: Remove a WARN_ON_ONCE() call
  blk-mq: update hctx->dispatch_busy in case of real scheduler
  blk: Fix lock inversion between ioc lock and bfqd lock
  bfq: Remove merged request already in bfq_requests_merged()
  block: pass a gendisk to bdev_disk_changed
  block: move bdev_disk_changed
  block: add the events* attributes to disk_attrs
  block: move the disk events code to a separate file
  block: fix trace completion for chained bio
  block/partitions/msdos: Fix typo inidicator -> indicator
  block, bfq: reset waker pointer with shared queues
  block, bfq: check waker only for queues with no in-flight I/O
  block, bfq: avoid delayed merge of async queues
  block, bfq: boost throughput by extending queue-merging times
  block, bfq: consider also creation time in delayed stable merge
  block, bfq: fix delayed stable merge check
  block, bfq: let also stably merged queues enjoy weight raising
  blk-wbt: make sure throttle is enabled properly
  blk-wbt: introduce a new disable state to prevent false positive by rwb_enabled()
  ...
 2021-06-30 12:12:56 -07:00
Linus Torvalds
65090f30ab Merge branch 'akpm' (patches from Andrew) 
Merge misc updates from Andrew Morton:
 "191 patches.

  Subsystems affected by this patch series: kthread, ia64, scripts,
  ntfs, squashfs, ocfs2, kernel/watchdog, and mm (gup, pagealloc, slab,
  slub, kmemleak, dax, debug, pagecache, gup, swap, memcg, pagemap,
  mprotect, bootmem, dma, tracing, vmalloc, kasan, initialization,
  pagealloc, and memory-failure)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (191 commits)
  mm,hwpoison: make get_hwpoison_page() call get_any_page()
  mm,hwpoison: send SIGBUS with error virutal address
  mm/page_alloc: split pcp->high across all online CPUs for cpuless nodes
  mm/page_alloc: allow high-order pages to be stored on the per-cpu lists
  mm: replace CONFIG_FLAT_NODE_MEM_MAP with CONFIG_FLATMEM
  mm: replace CONFIG_NEED_MULTIPLE_NODES with CONFIG_NUMA
  docs: remove description of DISCONTIGMEM
  arch, mm: remove stale mentions of DISCONIGMEM
  mm: remove CONFIG_DISCONTIGMEM
  m68k: remove support for DISCONTIGMEM
  arc: remove support for DISCONTIGMEM
  arc: update comment about HIGHMEM implementation
  alpha: remove DISCONTIGMEM and NUMA
  mm/page_alloc: move free_the_page
  mm/page_alloc: fix counting of managed_pages
  mm/page_alloc: improve memmap_pages dbg msg
  mm: drop SECTION_SHIFT in code comments
  mm/page_alloc: introduce vm.percpu_pagelist_high_fraction
  mm/page_alloc: limit the number of pages on PCP lists when reclaim is active
  mm/page_alloc: scale the number of pages that are batch freed
  ...
 2021-06-29 17:29:11 -07:00
Linus Torvalds
5e6928249b ACPI updates for 5.14-rc1 
- Update ACPICA code in the kernel to upstrea revision 20210604
    including the following changes:
 
    * Add defines for the CXL Host Bridge Structureand and add the
      CFMWS structure definition to CEDT (Alison Schofield).
    * iASL: Finish support for the IVRS ACPI table (Bob Moore).
    * iASL: Add support for the SVKL table (Bob Moore).
    * iASL: Add full support for RGRT ACPI table (Bob Moore).
    * iASL: Add support for the BDAT ACPI table (Bob Moore).
    * iASL: add disassembler support for PRMT (Erik Kaneda).
    * Fix memory leak caused by _CID repair function (Erik Kaneda).
    * Add support for PlatformRtMechanism OpRegion (Erik Kaneda).
    * Add PRMT module header to facilitate parsing (Erik Kaneda).
    * Add _PLD panel positions (Fabian Wüthrich).
    * MADT: add Multiprocessor Wakeup Mailbox Structure and the
      SVKL table headers (Kuppuswamy Sathyanarayanan).
    * Use ACPI_FALLTHROUGH (Wei Ming Chen).
 
  - Add preliminary support for the Platform Runtime Mechanism (PRM)
    to allow the AML interpreter to call PRM functions (Erik Kaneda).
 
  - Address some issues related to the handling of device dependencies
    reported by _DEP in the ACPI device enumeration code and clean up
    some related pieces of it (Rafael Wysocki).
 
  - Improve the tracking of states of ACPI power resources (Rafael
    Wysocki).
 
  - Improve ACPI support for suspend-to-idle on AMD systems (Alex
    Deucher, Mario Limonciello, Pratik Vishwakarma).
 
  - Continue the unification and cleanup of message printing in the
    ACPI code (Hanjun Guo, Heiner Kallweit).
 
  - Fix possible buffer overrun issue with the description_show()
    sysfs attribute method (Krzysztof Wilczyński).
 
  - Improve the acpi_mask_gpe kernel command line parameter handling
    and clean up the core ACPI code related to sysfs (Andy Shevchenko,
    Baokun Li, Clayton Casciato).
 
  - Postpone bringing devices in the general ACPI PM domain to D0
    during resume from system-wide suspend until they are really
    needed (Dmitry Torokhov).
 
  - Make the ACPI processor driver fix up C-state latency if not
    ordered (Mario Limonciello).
 
  - Add support for identifying devices depening on the given one
    that are not its direct descendants with the help of _DEP (Daniel
    Scally).
 
  - Extend the checks related to ACPI IRQ overrides on x86 in order to
    avoid false-positives (Hui Wang).
 
  - Add battery DPTF participant for Intel SoCs (Sumeet Pawnikar).
 
  - Rearrange the ACPI fan driver and device power management code to
    use a common list of device IDs (Rafael Wysocki).
 
  - Fix clang CFI violation in the ACPI BGRT table parsing code and
    clean it up (Nathan Chancellor).
 
  - Add GPE-related quirks for some laptops to the EC driver (Chris
    Chiu, Zhang Rui).
 
  - Make the ACPI PPTT table parsing code populate the cache-id
    value if present in the firmware (James Morse).
 
  - Remove redundant clearing of context->ret.pointer from
    acpi_run_osc() (Hans de Goede).
 
  - Add missing acpi_put_table() in acpi_init_fpdt() (Jing Xiangfeng).
 
  - Make ACPI APEI handle ARM Processor Error CPER records like
    Memory Error ones to avoid user space task lockups (Xiaofei Tan).
 
  - Stop warning about disabled ACPI in APEI (Jon Hunter).
 
  - Fix fall-through warning for Clang in the SBSHC driver (Gustavo A.
    R. Silva).
 
  - Add custom DSDT file as Makefile prerequisite (Richard Fitzgerald).
 
  - Initialize local variable to avoid garbage being returned (Colin
    Ian King).
 
  - Simplify assorted pieces of code, address assorted coding style
    and documentation issues and comment typos (Baokun Li, Christophe
    JAILLET, Clayton Casciato, Liu Shixin, Shaokun Zhang, Wei Yongjun,
    Yang Li, Zhen Lei).
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Merge tag 'acpi-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI updates from Rafael Wysocki:
 "These update the ACPICA code in the kernel to the 20210604 upstream
  revision, add preliminary support for the Platform Runtime Mechanism
  (PRM), address issues related to the handling of device dependencies
  in the ACPI device eunmeration code, improve the tracking of ACPI
  power resource states, improve the ACPI support for suspend-to-idle on
  AMD systems, continue the unification of message printing in the ACPI
  code, address assorted issues and clean up the code in a number of
  places.

  Specifics:

   - Update ACPICA code in the kernel to upstrea revision 20210604
     including the following changes:

      - Add defines for the CXL Host Bridge Structureand and add the
        CFMWS structure definition to CEDT (Alison Schofield).
      - iASL: Finish support for the IVRS ACPI table (Bob Moore).
      - iASL: Add support for the SVKL table (Bob Moore).
      - iASL: Add full support for RGRT ACPI table (Bob Moore).
      - iASL: Add support for the BDAT ACPI table (Bob Moore).
      - iASL: add disassembler support for PRMT (Erik Kaneda).
      - Fix memory leak caused by _CID repair function (Erik Kaneda).
      - Add support for PlatformRtMechanism OpRegion (Erik Kaneda).
      - Add PRMT module header to facilitate parsing (Erik Kaneda).
      - Add _PLD panel positions (Fabian Wüthrich).
      - MADT: add Multiprocessor Wakeup Mailbox Structure and the SVKL
        table headers (Kuppuswamy Sathyanarayanan).
      - Use ACPI_FALLTHROUGH (Wei Ming Chen).

   - Add preliminary support for the Platform Runtime Mechanism (PRM) to
     allow the AML interpreter to call PRM functions (Erik Kaneda).

   - Address some issues related to the handling of device dependencies
     reported by _DEP in the ACPI device enumeration code and clean up
     some related pieces of it (Rafael Wysocki).

   - Improve the tracking of states of ACPI power resources (Rafael
     Wysocki).

   - Improve ACPI support for suspend-to-idle on AMD systems (Alex
     Deucher, Mario Limonciello, Pratik Vishwakarma).

   - Continue the unification and cleanup of message printing in the
     ACPI code (Hanjun Guo, Heiner Kallweit).

   - Fix possible buffer overrun issue with the description_show() sysfs
     attribute method (Krzysztof Wilczyński).

   - Improve the acpi_mask_gpe kernel command line parameter handling
     and clean up the core ACPI code related to sysfs (Andy Shevchenko,
     Baokun Li, Clayton Casciato).

   - Postpone bringing devices in the general ACPI PM domain to D0
     during resume from system-wide suspend until they are really needed
     (Dmitry Torokhov).

   - Make the ACPI processor driver fix up C-state latency if not
     ordered (Mario Limonciello).

   - Add support for identifying devices depening on the given one that
     are not its direct descendants with the help of _DEP (Daniel
     Scally).

   - Extend the checks related to ACPI IRQ overrides on x86 in order to
     avoid false-positives (Hui Wang).

   - Add battery DPTF participant for Intel SoCs (Sumeet Pawnikar).

   - Rearrange the ACPI fan driver and device power management code to
     use a common list of device IDs (Rafael Wysocki).

   - Fix clang CFI violation in the ACPI BGRT table parsing code and
     clean it up (Nathan Chancellor).

   - Add GPE-related quirks for some laptops to the EC driver (Chris
     Chiu, Zhang Rui).

   - Make the ACPI PPTT table parsing code populate the cache-id value
     if present in the firmware (James Morse).

   - Remove redundant clearing of context->ret.pointer from
     acpi_run_osc() (Hans de Goede).

   - Add missing acpi_put_table() in acpi_init_fpdt() (Jing Xiangfeng).

   - Make ACPI APEI handle ARM Processor Error CPER records like Memory
     Error ones to avoid user space task lockups (Xiaofei Tan).

   - Stop warning about disabled ACPI in APEI (Jon Hunter).

   - Fix fall-through warning for Clang in the SBSHC driver (Gustavo A.
     R. Silva).

   - Add custom DSDT file as Makefile prerequisite (Richard Fitzgerald).

   - Initialize local variable to avoid garbage being returned (Colin
     Ian King).

   - Simplify assorted pieces of code, address assorted coding style and
     documentation issues and comment typos (Baokun Li, Christophe
     JAILLET, Clayton Casciato, Liu Shixin, Shaokun Zhang, Wei Yongjun,
     Yang Li, Zhen Lei)"

* tag 'acpi-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (97 commits)
  ACPI: PM: postpone bringing devices to D0 unless we need them
  ACPI: tables: Add custom DSDT file as makefile prerequisite
  ACPI: bgrt: Use sysfs_emit
  ACPI: bgrt: Fix CFI violation
  ACPI: EC: trust DSDT GPE for certain HP laptop
  ACPI: scan: Simplify acpi_table_events_fn()
  ACPI: PM: Adjust behavior for field problems on AMD systems
  ACPI: PM: s2idle: Add support for new Microsoft UUID
  ACPI: PM: s2idle: Add support for multiple func mask
  ACPI: PM: s2idle: Refactor common code
  ACPI: PM: s2idle: Use correct revision id
  ACPI: sysfs: Remove tailing return statement in void function
  ACPI: sysfs: Use __ATTR_RO() and __ATTR_RW() macros
  ACPI: sysfs: Sort headers alphabetically
  ACPI: sysfs: Refactor param_get_trace_state() to drop dead code
  ACPI: sysfs: Unify pattern of memory allocations
  ACPI: sysfs: Allow bitmap list to be supplied to acpi_mask_gpe
  ACPI: sysfs: Make sparse happy about address space in use
  ACPI: scan: Fix race related to dropping dependencies
  ACPI: scan: Reorganize acpi_device_add()
  ...
 2021-06-29 13:39:41 -07:00
Linus Torvalds
3563f55ce6 Power management updates for 5.14-rc1 
- Make intel_pstate support hybrid processors using abstract
    performance units in the HWP interface (Rafael Wysocki).
 
  - Add Icelake servers and Cometlake support in no-HWP mode to
    intel_pstate (Giovanni Gherdovich).
 
  - Make cpufreq_online() error path be consistent with the CPU
    device removal path in cpufreq (Rafael Wysocki).
 
  - Clean up 3 cpufreq drivers and the statistics code (Hailong Liu,
    Randy Dunlap, Shaokun Zhang).
 
  - Make intel_idle use special idle state parameters for C6 when
    package C-states are disabled (Chen Yu).
 
  - Rework the TEO (timer events oriented) cpuidle governor to address
    some theoretical shortcomings in it (Rafael Wysocki).
 
  - Drop unneeded semicolon from the TEO governor (Wan Jiabing).
 
  - Modify the runtime PM framework to accept unassigned suspend
    and resume callback pointers (Ulf Hansson).
 
  - Improve pm_runtime_get_sync() documentation (Krzysztof Kozlowski).
 
  - Improve device performance states support in the generic power
    domains (genpd) framework (Ulf Hansson).
 
  - Fix some documentation issues in genpd (Yang Yingliang).
 
  - Make the operating performance points (OPP) framework use the
    required-opps DT property in use cases that are not related to
    genpd (Hsin-Yi Wang).
 
  - Make lazy_link_required_opp_table() use list_del_init instead of
    list_del/INIT_LIST_HEAD (Yang Yingliang).
 
  - Simplify wake IRQs handling in the core system-wide sleep support
    code and clean up some coding style inconsistencies in it (Tian
    Tao, Zhen Lei).
 
  - Add cooling support to the tegra30 devfreq driver and improve its
    DT bindings (Dmitry Osipenko).
 
  - Fix some assorted issues in the devfreq core and drivers (Chanwoo
    Choi, Dong Aisheng, YueHaibing).
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Merge tag 'pm-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management updates from Rafael Wysocki:
 "These add hybrid processors support to the intel_pstate driver and
  make it work with more processor models when HWP is disabled, make the
  intel_idle driver use special C6 idle state paremeters when package
  C-states are disabled, add cooling support to the tegra30 devfreq
  driver, rework the TEO (timer events oriented) cpuidle governor,
  extend the OPP (operating performance points) framework to use the
  required-opps DT property in more cases, fix some issues and clean up
  a number of assorted pieces of code.

  Specifics:

   - Make intel_pstate support hybrid processors using abstract
     performance units in the HWP interface (Rafael Wysocki).

   - Add Icelake servers and Cometlake support in no-HWP mode to
     intel_pstate (Giovanni Gherdovich).

   - Make cpufreq_online() error path be consistent with the CPU device
     removal path in cpufreq (Rafael Wysocki).

   - Clean up 3 cpufreq drivers and the statistics code (Hailong Liu,
     Randy Dunlap, Shaokun Zhang).

   - Make intel_idle use special idle state parameters for C6 when
     package C-states are disabled (Chen Yu).

   - Rework the TEO (timer events oriented) cpuidle governor to address
     some theoretical shortcomings in it (Rafael Wysocki).

   - Drop unneeded semicolon from the TEO governor (Wan Jiabing).

   - Modify the runtime PM framework to accept unassigned suspend and
     resume callback pointers (Ulf Hansson).

   - Improve pm_runtime_get_sync() documentation (Krzysztof Kozlowski).

   - Improve device performance states support in the generic power
     domains (genpd) framework (Ulf Hansson).

   - Fix some documentation issues in genpd (Yang Yingliang).

   - Make the operating performance points (OPP) framework use the
     required-opps DT property in use cases that are not related to
     genpd (Hsin-Yi Wang).

   - Make lazy_link_required_opp_table() use list_del_init instead of
     list_del/INIT_LIST_HEAD (Yang Yingliang).

   - Simplify wake IRQs handling in the core system-wide sleep support
     code and clean up some coding style inconsistencies in it (Tian
     Tao, Zhen Lei).

   - Add cooling support to the tegra30 devfreq driver and improve its
     DT bindings (Dmitry Osipenko).

   - Fix some assorted issues in the devfreq core and drivers (Chanwoo
     Choi, Dong Aisheng, YueHaibing)"

* tag 'pm-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (39 commits)
  PM / devfreq: passive: Fix get_target_freq when not using required-opp
  cpufreq: Make cpufreq_online() call driver->offline() on errors
  opp: Allow required-opps to be used for non genpd use cases
  cpuidle: teo: remove unneeded semicolon in teo_select()
  dt-bindings: devfreq: tegra30-actmon: Add cooling-cells
  dt-bindings: devfreq: tegra30-actmon: Convert to schema
  PM / devfreq: userspace: Use DEVICE_ATTR_RW macro
  PM: runtime: Clarify documentation when callbacks are unassigned
  PM: runtime: Allow unassigned ->runtime_suspend|resume callbacks
  PM: runtime: Improve path in rpm_idle() when no callback
  PM: hibernate: remove leading spaces before tabs
  PM: sleep: remove trailing spaces and tabs
  PM: domains: Drop/restore performance state votes for devices at runtime PM
  PM: domains: Return early if perf state is already set for the device
  PM: domains: Split code in dev_pm_genpd_set_performance_state()
  cpuidle: teo: Use kerneldoc documentation in admin-guide
  cpuidle: teo: Rework most recent idle duration values treatment
  cpuidle: teo: Change the main idle state selection logic
  cpuidle: teo: Cosmetic modification of teo_select()
  cpuidle: teo: Cosmetic modifications of teo_update()
  ...
 2021-06-29 13:36:06 -07:00
Linus Torvalds
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Merge tag 'timers-core-2021-06-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer updates from Thomas Gleixner:
 "Time and clocksource/clockevent related updates:

  Core changes:

   - Infrastructure to support per CPU "broadcast" devices for per CPU
     clockevent devices which stop in deep idle states. This allows us
     to utilize the more efficient architected timer on certain ARM SoCs
     for normal operation instead of permanentely using the slow to
     access SoC specific clockevent device.

   - Print the name of the broadcast/wakeup device in /proc/timer_list

   - Make the clocksource watchdog more robust against delays between
     reading the current active clocksource and the watchdog
     clocksource. Such delays can be caused by NMIs, SMIs and vCPU
     preemption.

     Handle this by reading the watchdog clocksource twice, i.e. before
     and after reading the current active clocksource. In case that the
     two watchdog reads shows an excessive time delta, the read sequence
     is repeated up to 3 times.

   - Improve the debug output and add a test module for the watchdog
     mechanism.

   - Reimplementation of the venerable time64_to_tm() function with a
     faster and significantly smaller version. Straight from the source,
     i.e. the author of the related research paper contributed this!

  Driver changes:

   - No new drivers, not even new device tree bindings!

   - Fixes, improvements and cleanups and all over the place"

* tag 'timers-core-2021-06-29' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (30 commits)
  time/kunit: Add missing MODULE_LICENSE()
  time: Improve performance of time64_to_tm()
  clockevents: Use list_move() instead of list_del()/list_add()
  clocksource: Print deviation in nanoseconds when a clocksource becomes unstable
  clocksource: Provide kernel module to test clocksource watchdog
  clocksource: Reduce clocksource-skew threshold
  clocksource: Limit number of CPUs checked for clock synchronization
  clocksource: Check per-CPU clock synchronization when marked unstable
  clocksource: Retry clock read if long delays detected
  clockevents: Add missing parameter documentation
  clocksource/drivers/timer-ti-dm: Drop unnecessary restore
  clocksource/arm_arch_timer: Improve Allwinner A64 timer workaround
  clocksource/drivers/arm_global_timer: Remove duplicated argument in arm_global_timer
  clocksource/drivers/arm_global_timer: Make symbol 'gt_clk_rate_change_nb' static
  arm: zynq: don't disable CONFIG_ARM_GLOBAL_TIMER due to CONFIG_CPU_FREQ anymore
  clocksource/drivers/arm_global_timer: Implement rate compensation whenever source clock changes
  clocksource/drivers/ingenic: Rename unreasonable array names
  clocksource/drivers/timer-ti-dm: Save and restore timer TIOCP_CFG
  clocksource/drivers/mediatek: Ack and disable interrupts on suspend
  clocksource/drivers/samsung_pwm: Constify source IO memory
  ...
 2021-06-29 12:31:16 -07:00
Mike Rapoport
48d9f3355a docs: remove description of DISCONTIGMEM 
Remove description of DISCONTIGMEM from the "Memory Models" document and
update VM sysctl description so that it won't mention DISCONIGMEM.

Link: https://lkml.kernel.org/r/20210608091316.3622-8-rppt@kernel.org
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-29 10:53:55 -07:00
Mel Gorman
74f4482209 mm/page_alloc: introduce vm.percpu_pagelist_high_fraction 
This introduces a new sysctl vm.percpu_pagelist_high_fraction.  It is
similar to the old vm.percpu_pagelist_fraction.  The old sysctl increased
both pcp->batch and pcp->high with the higher pcp->high potentially
reducing zone->lock contention.  However, the higher pcp->batch value also
potentially increased allocation latency while the PCP was refilled.  This
sysctl only adjusts pcp->high so that zone->lock contention is potentially
reduced but allocation latency during a PCP refill remains the same.

  # grep -E "high:|batch" /proc/zoneinfo | tail -2
              high:  649
              batch: 63

  # sysctl vm.percpu_pagelist_high_fraction=8
  # grep -E "high:|batch" /proc/zoneinfo | tail -2
              high:  35071
              batch: 63

  # sysctl vm.percpu_pagelist_high_fraction=64
              high:  4383
              batch: 63

  # sysctl vm.percpu_pagelist_high_fraction=0
              high:  649
              batch: 63

[mgorman@techsingularity.net: fix documentation]
  Link: https://lkml.kernel.org/r/20210528151010.GQ30378@techsingularity.net

Link: https://lkml.kernel.org/r/20210525080119.5455-7-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-29 10:53:55 -07:00
Mel Gorman
bbbecb35a4 mm/page_alloc: delete vm.percpu_pagelist_fraction 
Patch series "Calculate pcp->high based on zone sizes and active CPUs", v2.

The per-cpu page allocator (PCP) is meant to reduce contention on the zone
lock but the sizing of batch and high is archaic and neither takes the
zone size into account or the number of CPUs local to a zone.  With larger
zones and more CPUs per node, the contention is getting worse.
Furthermore, the fact that vm.percpu_pagelist_fraction adjusts both batch
and high values means that the sysctl can reduce zone lock contention but
also increase allocation latencies.

This series disassociates pcp->high from pcp->batch and then scales
pcp->high based on the size of the local zone with limited impact to
reclaim and accounting for active CPUs but leaves pcp->batch static.  It
also adapts the number of pages that can be on the pcp list based on
recent freeing patterns.

The motivation is partially to adjust to larger memory sizes but is also
driven by the fact that large batches of page freeing via release_pages()
often shows zone contention as a major part of the problem.  Another is a
bug report based on an older kernel where a multi-terabyte process can
takes several minutes to exit.  A workaround was to use
vm.percpu_pagelist_fraction to increase the pcp->high value but testing
indicated that a production workload could not use the same values because
of an increase in allocation latencies.  Unfortunately, I cannot reproduce
this test case myself as the multi-terabyte machines are in active use but
it should alleviate the problem.

The series aims to address both and partially acts as a pre-requisite.
pcp only works with order-0 which is useless for SLUB (when using high
orders) and THP (unconditionally).  To store high-order pages on PCP, the
pcp->high values need to be increased first.

This patch (of 6):

The vm.percpu_pagelist_fraction is used to increase the batch and high
limits for the per-cpu page allocator (PCP).  The intent behind the sysctl
is to reduce zone lock acquisition when allocating/freeing pages but it
has a problem.  While it can decrease contention, it can also increase
latency on the allocation side due to unreasonably large batch sizes.
This leads to games where an administrator adjusts
percpu_pagelist_fraction on the fly to work around contention and
allocation latency problems.

This series aims to alleviate the problems with zone lock contention while
avoiding the allocation-side latency problems.  For the purposes of
review, it's easier to remove this sysctl now and reintroduce a similar
sysctl later in the series that deals only with pcp->high.

Link: https://lkml.kernel.org/r/20210525080119.5455-1-mgorman@techsingularity.net
Link: https://lkml.kernel.org/r/20210525080119.5455-2-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-29 10:53:54 -07:00
Gavin Shan
f58780a8e3 mm/page_reporting: export reporting order as module parameter 
The macro PAGE_REPORTING_MIN_ORDER is defined as the page reporting
threshold.  It can't be adjusted at runtime.

This introduces a variable (@page_reporting_order) to replace the marcro
(PAGE_REPORTING_MIN_ORDER).  MAX_ORDER is assigned to it initially,
meaning the page reporting is disabled.  It will be specified by driver if
valid one is provided.  Otherwise, it will fall back to @pageblock_order.
It's also exported so that the page reporting order can be adjusted at
runtime.

Link: https://lkml.kernel.org/r/20210625014710.42954-3-gshan@redhat.com
Signed-off-by: Gavin Shan <gshan@redhat.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Alexander Duyck <alexanderduyck@fb.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-29 10:53:47 -07:00
Wang Qing
256f7a6791 doc: watchdog: modify the doc related to "watchdog/%u" 
"watchdog/%u" threads has be replaced by cpu_stop_work.  The current
description is extremely misleading.

Link: https://lkml.kernel.org/r/1619687073-24686-5-git-send-email-wangqing@vivo.com
Signed-off-by: Wang Qing <wangqing@vivo.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: "Guilherme G. Piccoli" <gpiccoli@canonical.com>
Cc: Joe Perches <joe@perches.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Cc: Qais Yousef <qais.yousef@arm.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Santosh Sivaraj <santosh@fossix.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-29 10:53:46 -07:00
Wang Qing
e55fda8cdc doc: watchdog: modify the explanation related to watchdog thread 
"watchdog/%u" threads has be replaced by cpu_stop_work.  The current
description is extremely misleading.

Link: https://lkml.kernel.org/r/1619687073-24686-4-git-send-email-wangqing@vivo.com
Signed-off-by: Wang Qing <wangqing@vivo.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: "Guilherme G. Piccoli" <gpiccoli@canonical.com>
Cc: Joe Perches <joe@perches.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Cc: Qais Yousef <qais.yousef@arm.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Santosh Sivaraj <santosh@fossix.org>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-06-29 10:53:46 -07:00
Rafael J. Wysocki
ed562d280c Merge branches 'pm-cpufreq' and 'pm-cpuidle' 
* pm-cpufreq:
  cpufreq: Make cpufreq_online() call driver->offline() on errors
  cpufreq: loongson2: Remove unused linux/sched.h headers
  cpufreq: sh: Remove unused linux/sched.h headers
  cpufreq: stats: Clean up local variable in cpufreq_stats_create_table()
  cpufreq: intel_pstate: hybrid: Fix build with CONFIG_ACPI unset
  cpufreq: sc520_freq: add 'fallthrough' to one case
  cpufreq: intel_pstate: Add Cometlake support in no-HWP mode
  cpufreq: intel_pstate: Add Icelake servers support in no-HWP mode
  cpufreq: intel_pstate: hybrid: CPU-specific scaling factor
  cpufreq: intel_pstate: hybrid: Avoid exposing two global attributes

* pm-cpuidle:
  cpuidle: teo: remove unneeded semicolon in teo_select()
  cpuidle: teo: Use kerneldoc documentation in admin-guide
  cpuidle: teo: Rework most recent idle duration values treatment
  cpuidle: teo: Change the main idle state selection logic
  cpuidle: teo: Cosmetic modification of teo_select()
  cpuidle: teo: Cosmetic modifications of teo_update()
  intel_idle: Adjust the SKX C6 parameters if PC6 is disabled
 2021-06-29 15:53:07 +02:00
Linus Torvalds
07bdc0746a pstore updates for v5.14-rc1 
Use normal block device I/O path for pstore/blk. (Christoph Hellwig,
 Kees Cook, Pu Lehui)
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Merge tag 'pstore-v5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull pstore updates from Kees Cook:
 "Use normal block device I/O path for pstore/blk. (Christoph Hellwig,
  Kees Cook, Pu Lehui)"

* tag 'pstore-v5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  pstore/blk: Include zone in pstore_device_info
  pstore/blk: Fix kerndoc and redundancy on blkdev param
  pstore/blk: Use the normal block device I/O path
  pstore/blk: Move verify_size() macro out of function
  pstore/blk: Improve failure reporting
 2021-06-28 19:57:00 -07:00
Linus Torvalds
233a806b00 This was a reasonably active cycle for documentation; this pull includes: 
- Some kernel-doc cleanups.  That script is still regex onslaught from
    hell, but it has gotten a little better.
 
  - Improvements to the checkpatch docs, which are also used by the tool
    itself.
 
  - A major update to the pathname lookup documentation.
 
  - Elimination of :doc: markup, since our automarkup magic can create
    references from filenames without all the extra noise.
 
  - The flurry of Chinese translation activity continues.
 
 Plus, of course, the usual collection of updates, typo fixes, and warning
 fixes.
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Merge tag 'docs-5.14' of git://git.lwn.net/linux

Pull documentation updates from Jonathan Corbet:
 "This was a reasonably active cycle for documentation; this includes:

   - Some kernel-doc cleanups. That script is still regex onslaught from
     hell, but it has gotten a little better.

   - Improvements to the checkpatch docs, which are also used by the
     tool itself.

   - A major update to the pathname lookup documentation.

   - Elimination of :doc: markup, since our automarkup magic can create
     references from filenames without all the extra noise.

   - The flurry of Chinese translation activity continues.

  Plus, of course, the usual collection of updates, typo fixes, and
  warning fixes"

* tag 'docs-5.14' of git://git.lwn.net/linux: (115 commits)
  docs: path-lookup: use bare function() rather than literals
  docs: path-lookup: update symlink description
  docs: path-lookup: update get_link() ->follow_link description
  docs: path-lookup: update WALK_GET, WALK_PUT desc
  docs: path-lookup: no get_link()
  docs: path-lookup: update i_op->put_link and cookie description
  docs: path-lookup: i_op->follow_link replaced with i_op->get_link
  docs: path-lookup: Add macro name to symlink limit description
  docs: path-lookup: remove filename_mountpoint
  docs: path-lookup: update do_last() part
  docs: path-lookup: update path_mountpoint() part
  docs: path-lookup: update path_to_nameidata() part
  docs: path-lookup: update follow_managed() part
  docs: Makefile: Use CONFIG_SHELL not SHELL
  docs: Take a little noise out of the build process
  docs: x86: avoid using ReST :doc:`foo` markup
  docs: virt: kvm: s390-pv-boot.rst: avoid using ReST :doc:`foo` markup
  docs: userspace-api: landlock.rst: avoid using ReST :doc:`foo` markup
  docs: trace: ftrace.rst: avoid using ReST :doc:`foo` markup
  docs: trace: coresight: coresight.rst: avoid using ReST :doc:`foo` markup
  ...
 2021-06-28 16:53:05 -07:00
Linus Torvalds
31e798fd6f media updates for v5.14-rc1 
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Merge tag 'media/v5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

Pull media updates from Mauro Carvalho Chehab:

 - V4L2 core control API was split into separate files

 - New RC maps: tango and tc-90405

 - Hantro driver got support for G2/HEVC decoder

 - av7710 is moving to staging, together with some legacy APIs

 - several cleanups related to compat_ioctl32 code

 - Move the MPEG-2 stateless control type out of staging

 - Address several issues with RPM get logic on media drivers

 - Lots of cleanups, bug fixes and improvements.

* tag 'media/v5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (394 commits)
  media: s5p-mfc: Fix display delay control creation
  media: mtk-vpu: on suspend, read/write regs only if vpu is running
  media: video-mux: Skip dangling endpoints
  media: Fix Media Controller API config checks
  media: i2c: rdacm20: Re-work ov10635 reset
  media: i2c: rdacm20: Check return values
  media: i2c: rdacm20: Report camera module name
  media: i2c: rdacm20: Enable noise immunity
  media: i2c: rdacm20: Embed 'serializer' field
  media: i2c: rdacm21: Power up OV10640 before OV490
  media: i2c: rdacm21: Fix OV10640 powerup
  media: i2c: rdacm21: Add delay after OV490 reset
  media: i2c: max9271: Introduce wake_up() function
  media: i2c: max9271: Check max9271_write() return
  media: i2c: max9286: Rework comments in .bound()
  media: i2c: max9286: Define high channel amplitude
  media: i2c: max9286: Cache channel amplitude
  media: i2c: max9286: Rename reverse_channel_mv
  media: i2c: max9286: Adjust parameters indent
  media: hantro: add support for Rockchip RK3036
  ...
 2021-06-28 15:49:58 -07:00
Mikulas Patocka
5c0de3d72f dm writecache: make writeback pause configurable 
Commit 95b88f4d71 ("dm writecache: pause
writeback if cache full and origin being written directly") introduced a
code that pauses cache flushing if we are issuing writes directly to the
origin.

Improve that initial commit by making the timeout code configurable
(via the option "pause_writeback"). Also change the default from 1s to
3s because it performed better.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
 2021-06-28 16:30:13 -04:00
Linus Torvalds
1b1cf8fe99 Changes in this cycle were: 
- Add the "ratelimit:N" parameter to the split_lock_detect= boot option,
    to rate-limit the generation of bus-lock exceptions. This is both
    easier on system resources and kinder to offending applications than
    the current policy of outright killing them.
 
  - Document the split-lock detection feature and its parameters.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-splitlock-2021-06-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 splitlock updates from Ingo Molnar:

 - Add the "ratelimit:N" parameter to the split_lock_detect= boot
   option, to rate-limit the generation of bus-lock exceptions.

   This is both easier on system resources and kinder to offending
   applications than the current policy of outright killing them.

 - Document the split-lock detection feature and its parameters.

* tag 'x86-splitlock-2021-06-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Documentation/x86: Add ratelimit in buslock.rst
  Documentation/admin-guide: Add bus lock ratelimit
  x86/bus_lock: Set rate limit for bus lock
  Documentation/x86: Add buslock.rst
 2021-06-28 13:30:02 -07:00
Linus Torvalds
8e4d7a78f0 Misc cleanups & removal of obsolete code. 
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'x86-cleanups-2021-06-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 cleanups from Ingo Molnar:
 "Misc cleanups & removal of obsolete code"

* tag 'x86-cleanups-2021-06-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/sgx: Correct kernel-doc's arg name in sgx_encl_release()
  doc: Remove references to IBM Calgary
  x86/setup: Document that Windows reserves the first MiB
  x86/crash: Remove crash_reserve_low_1M()
  x86/setup: Remove CONFIG_X86_RESERVE_LOW and reservelow= options
  x86/alternative: Align insn bytes vertically
  x86: Fix leftover comment typos
  x86/asm: Simplify __smp_mb() definition
  x86/alternatives: Make the x86nops[] symbol static
 2021-06-28 13:10:25 -07:00
Mikulas Patocka
611c3e168b dm writecache: add optional "metadata_only" parameter 
Add a "metadata_only" parameter that when present: only metadata is
promoted to the cache. This option improves performance for heavier
REQ_META workloads (e.g. device-mapper-test-suite's "git clone and
checkout" benchmark improves from 341s to 312s).

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
 2021-06-25 15:25:21 -04:00
Mike Snitzer
cd039afa0a dm writecache: add "cleaner" and "max_age" to Documentation 
Backfill missing Documentation.

Fixes: 93de44eb3f ("dm writecache: implement the "cleaner" policy")
Fixes: 3923d4854e ("dm writecache: implement gradual cleanup")
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
 2021-06-25 15:25:19 -04:00
Joerg Roedel
2b9d8e3e9a Merge branches 'iommu/fixes', 'arm/rockchip', 'arm/smmu', 'x86/vt-d', 'x86/amd', 'virtio' and 'core' into next 2021-06-25 15:23:25 +02:00
Paul E. McKenney
1253b9b87e clocksource: Provide kernel module to test clocksource watchdog 
When the clocksource watchdog marks a clock as unstable, this might
be due to that clock being unstable or it might be due to delays that
happen to occur between the reads of the two clocks.  It would be good
to have a way of testing the clocksource watchdog's ability to
distinguish between these two causes of clock skew and instability.

Therefore, provide a new clocksource-wdtest module selected by a new
TEST_CLOCKSOURCE_WATCHDOG Kconfig option.  This module has a single module
parameter named "holdoff" that provides the number of seconds of delay
before testing should start, which defaults to zero when built as a module
and to 10 seconds when built directly into the kernel.  Very large systems
that boot slowly may need to increase the value of this module parameter.

This module uses hand-crafted clocksource structures to do its testing,
thus avoiding messing up timing for the rest of the kernel and for user
applications.  This module first verifies that the ->uncertainty_margin
field of the clocksource structures are set sanely.  It then tests the
delay-detection capability of the clocksource watchdog, increasing the
number of consecutive delays injected, first provoking console messages
complaining about the delays and finally forcing a clock-skew event.
Unexpected test results cause at least one WARN_ON_ONCE() console splat.
If there are no splats, the test has passed.  Finally, it fuzzes the
value returned from a clocksource to test the clocksource watchdog's
ability to detect time skew.

This module checks the state of its clocksource after each test, and
uses WARN_ON_ONCE() to emit a console splat if there are any failures.
This should enable all types of test frameworks to detect any such
failures.

This facility is intended for diagnostic use only, and should be avoided
on production systems.

Reported-by: Chris Mason <clm@fb.com>
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Feng Tang <feng.tang@intel.com>
Link: https://lore.kernel.org/r/20210527190124.440372-5-paulmck@kernel.org
 2021-06-22 16:53:17 +02:00
Paul E. McKenney
fa218f1cce clocksource: Limit number of CPUs checked for clock synchronization 
Currently, if skew is detected on a clock marked CLOCK_SOURCE_VERIFY_PERCPU,
that clock is checked on all CPUs.  This is thorough, but might not be
what you want on a system with a few tens of CPUs, let alone a few hundred
of them.

Therefore, by default check only up to eight randomly chosen CPUs.  Also
provide a new clocksource.verify_n_cpus kernel boot parameter.  A value of
-1 says to check all of the CPUs, and a non-negative value says to randomly
select that number of CPUs, without concern about selecting the same CPU
multiple times.  However, make use of a cpumask so that a given CPU will be
checked at most once.

Suggested-by: Thomas Gleixner <tglx@linutronix.de> # For verify_n_cpus=1.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Feng Tang <feng.tang@intel.com>
Link: https://lore.kernel.org/r/20210527190124.440372-3-paulmck@kernel.org
 2021-06-22 16:53:16 +02:00
Paul E. McKenney
db3a34e174 clocksource: Retry clock read if long delays detected 
When the clocksource watchdog marks a clock as unstable, this might be due
to that clock being unstable or it might be due to delays that happen to
occur between the reads of the two clocks.  Yes, interrupts are disabled
across those two reads, but there are no shortage of things that can delay
interrupts-disabled regions of code ranging from SMI handlers to vCPU
preemption.  It would be good to have some indication as to why the clock
was marked unstable.

Therefore, re-read the watchdog clock on either side of the read from the
clock under test.  If the watchdog clock shows an excessive time delta
between its pair of reads, the reads are retried.

The maximum number of retries is specified by a new kernel boot parameter
clocksource.max_cswd_read_retries, which defaults to three, that is, up to
four reads, one initial and up to three retries.  If more than one retry
was required, a message is printed on the console (the occasional single
retry is expected behavior, especially in guest OSes).  If the maximum
number of retries is exceeded, the clock under test will be marked
unstable.  However, the probability of this happening due to various sorts
of delays is quite small.  In addition, the reason (clock-read delays) for
the unstable marking will be apparent.

Reported-by: Chris Mason <clm@fb.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Feng Tang <feng.tang@intel.com>
Link: https://lore.kernel.org/r/20210527190124.440372-1-paulmck@kernel.org
 2021-06-22 16:53:16 +02:00
Bart Van Assche
556910e392 block: Introduce the ioprio rq-qos policy 
Introduce an rq-qos policy that assigns an I/O priority to requests based
on blk-cgroup configuration settings. This policy has the following
advantages over the ioprio_set() system call:
- This policy is cgroup based so it has all the advantages of cgroups.
- While ioprio_set() does not affect page cache writeback I/O, this rq-qos
  controller affects page cache writeback I/O for filesystems that support
  assiociating a cgroup with writeback I/O. See also
  Documentation/admin-guide/cgroup-v2.rst.

Cc: Damien Le Moal <damien.lemoal@wdc.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20210618004456.7280-5-bvanassche@acm.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2021-06-21 15:03:40 -06:00
Rafael J. Wysocki
6cbab787c8 Merge back cpufreq material for v5.14. 2021-06-21 18:32:42 +02:00
Mauro Carvalho Chehab
2793e19d63 docs: admin-guide: sysctl: avoid using ReST :doc:foo markup 
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/12abd2290c7ebc05c89178d2556bea740bd70fac.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-06-17 13:24:36 -06:00
Mauro Carvalho Chehab
e499f4c297 docs: admin-guide: hw-vuln: avoid using ReST :doc:foo markup 
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/4e378517761f3df07165d5ecdac5a0a81577e68f.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-06-17 13:24:36 -06:00
Mauro Carvalho Chehab
17420f3138 docs: admin-guide: pm: avoid using ReST :doc:foo markup 
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/04616d9fc0b4a0d33486fa0018631a2db2eba860.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-06-17 13:24:36 -06:00
Mauro Carvalho Chehab
349660e944 docs: admin-guide: reporting-issues.rst: replace some characters 
The conversion tools used during DocBook/LaTeX/html/Markdown->ReST
conversion and some cut-and-pasted text contain some characters that
aren't easily reachable on standard keyboards and/or could cause
troubles when parsed by the documentation build system.

Replace the occurences of the following characters:

	- U+00a0 (' '): NO-BREAK SPACE
	  as it can cause lines being truncated on PDF output

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/551a2af0e654226067e5c376d3e2d959cc738f39.1623826294.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-06-17 13:22:33 -06:00
Andy Shevchenko
d3121e64ad ACPI: sysfs: Allow bitmap list to be supplied to acpi_mask_gpe 
Currently we need to use as many acpi_mask_gpe options as we want to have
GPEs to be masked. Even with two it already becomes inconveniently large
the kernel command line.

Instead, allow acpi_mask_gpe to represent bitmap list.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 2021-06-17 17:10:11 +02:00
Robin Murphy
531353e650 iommu: Update "iommu.strict" documentation 
Consolidating the flush queue logic also meant that the "iommu.strict"
option started taking effect on x86 as well. Make sure we document that.

Fixes: a250c23f15 ("iommu: remove DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/2c8c06e1b449d6b060c5bf9ad3b403cd142f405d.1623682646.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
 2021-06-17 17:03:46 +02:00
Steven Rostedt (VMware)
f38601368f tracing: Add tp_printk_stop_on_boot option 
Add a kernel command line option that disables printing of events to
console at late_initcall_sync(). This is useful when needing to see
specific events written to console on boot up, but not wanting it when
user space starts, as user space may make the console so noisy that the
system becomes inoperable.

Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
 2021-06-17 11:01:15 -04:00
Kir Kolyshkin
828615950b docs/cgroup-v1/blkio: update for 5.x kernels 
Commit bf382fb0bcef4 ("block: remove legacy IO schedulers", Oct 12 2018)
removes the CFQ scheduler, together with blkio.weight and
blkio.weight_device described in cgroup v1 documentation. Users are
supposed to use the BFQ scheduler, which cgroup file for setting weight
is blkio.bfq.weight, but there is no way to set per-device weight.

Later, commit 795fe54c2a per-device weights for BFQ, meaning that
blkio.bfq.weight and blkio.bfq.weight_device can be used in a way
similar to the old CFQ cgroup interface.

Yet, the cgroup v1 docs were never updated. Fix this:
 - use the new file names;
 - fix the range for weight (used to be 10..1000, now 1..1000);
 - link to BFQ scheduler docs.

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2021-06-16 11:32:03 -06:00
Kir Kolyshkin
37fe403898 docs/cgroup-v1/blkio: stop abusing itemized list 
Fix many formatting issues by stop (ab)using itemized lists for
everything (mostly replaced by definition lists).

Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2021-06-16 11:32:02 -06:00
Kees Cook
c811659bb9 pstore/blk: Fix kerndoc and redundancy on blkdev param 
Remove redundant details of blkdev and fix up resulting kerndoc.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kees Cook <keescook@chromium.org>
 2021-06-16 09:27:32 -07:00
Kees Cook
7bb9557b48 pstore/blk: Use the normal block device I/O path 
Stop poking into block layer internals and just open the block device
file an use kernel_read and kernel_write on it. Note that this means
the transformation from name_to_dev_t can't be used anymore when
pstore_blk is loaded as a module: a full filesystem device path name
must be used instead. Additionally removes ":internal:" kerndoc link,
since no such documentation remains.

Co-developed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kees Cook <keescook@chromium.org>
 2021-06-16 09:26:56 -07:00
Mauro Carvalho Chehab
6ef43d273e media: admin-guide: avoid using ReST :doc:foo markup 
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
 2021-06-16 07:26:46 +02:00
Mauro Carvalho Chehab
703ac06a88 media: docs: */media/index.rst: don't use ReST doc:foo 
The :doc:`foo` tag is auto-generated via automarkup.py.
    So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
 2021-06-16 07:26:46 +02:00
Tian Tao
05a463ec1b docs: cputopology: move the sysfs ABI description to right place 
Documentation/admin-guide/cputopology.rst is the wrong place to describe
sysfs ABI. So move the cputopology ABI things to
Documentation/ABI/stable/sysfs-devices-system-cpu and add a reference to
ABI doc in Documentation/admin-guide/cputopology.rst.

Link: https://lkml.kernel.org/r/20210319041618.14316-1-song.bao.hua@hisilicon.com
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Link: https://lore.kernel.org/r/20210611052249.25776-1-song.bao.hua@hisilicon.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-06-14 16:04:31 -06:00
Baoquan He
b1f4c36366 Documentation: kdump: update kdump guide 
Some parts of the guide are aged, hence need be updated.

1) The backup area of the 1st 640K on X86_64 has been removed
   by below commits, update the description accordingly.

   commit 7c321eb2b8 ("x86/kdump: Remove the backup region handling")
   commit 6f599d8423 ("x86/kdump: Always reserve the low 1M when the crashkernel option is specified")

2) Sort out the descripiton of "crashkernel syntax" part.

3) And some other minor cleanups.

Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-by: Dave Young <dyoung@redhat.com>
Link: https://lore.kernel.org/r/20210609083218.GB591017@MiWiFi-R3L-srv
[jc: added blank line to fix added build warning]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-06-14 08:12:01 -06:00
Kir Kolyshkin
a9edc03f13 docs: fix a cross-ref 
Commit acda97acb2 changes dax.txt to dax.rst.
Fix the references accordingly.

Cc: Igor Matheus Andrade Torrente <igormtorrente@gmail.com>
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
Link: https://lore.kernel.org/r/20210611030044.1982911-4-kolyshkin@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-06-13 17:02:46 -06:00
Rafael J. Wysocki
154ae8bb3c cpuidle: teo: Use kerneldoc documentation in admin-guide 
There are two descriptions of the TEO (Timer Events Oriented) cpuidle
governor in the kernel source tree, one in the C file containing its
code and one in cpuidle.rst which is part of admin-guide.

Instead of trying to keep them both in sync and in order to reduce
text duplication, include the governor description from the C file
directly into cpuidle.rst.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 2021-06-11 18:36:45 +02:00
Masami Hiramatsu
0ff2bb7d42 docs: bootconfig: Update for mixing value and subkeys 
Update document for the mixing value and subkeys on a key.

Link: https://lkml.kernel.org/r/162262196510.264090.15044943496205914148.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
 2021-06-10 13:41:26 -04:00
Joel Fernandes (Google)
0159bb020c Documentation: Add usecases, design and interface for core scheduling 
Now that core scheduling is merged, update the documentation.

Co-developed-by: Chris Hyser <chris.hyser@oracle.com>
Signed-off-by: Chris Hyser <chris.hyser@oracle.com>
Co-developed-by: Josh Don <joshdon@google.com>
Signed-off-by: Josh Don <joshdon@google.com>
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210603013136.370918-1-joel@joelfernandes.org
 2021-06-10 09:57:09 +02:00
Suren Baghdasaryan
3958e2d0c3 cgroup: make per-cgroup pressure stall tracking configurable 
PSI accounts stalls for each cgroup separately and aggregates it at each
level of the hierarchy. This causes additional overhead with psi_avgs_work
being called for each cgroup in the hierarchy. psi_avgs_work has been
highly optimized, however on systems with large number of cgroups the
overhead becomes noticeable.
Systems which use PSI only at the system level could avoid this overhead
if PSI can be configured to skip per-cgroup stall accounting.
Add "cgroup_disable=pressure" kernel command-line option to allow
requesting system-wide only pressure stall accounting. When set, it
keeps system-wide accounting under /proc/pressure/ but skips accounting
for individual cgroups and does not expose PSI nodes in cgroup hierarchy.

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
 2021-06-08 14:59:02 -04:00
Mike Rapoport
1a6a9044b9 x86/setup: Remove CONFIG_X86_RESERVE_LOW and reservelow= options 
The CONFIG_X86_RESERVE_LOW build time and reservelow= command line option
allowed to control the amount of memory under 1M that would be reserved at
boot to avoid using memory that can be potentially clobbered by BIOS.

Since the entire range under 1M is always reserved there is no need for
these options anymore and they can be removed.

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210601075354.5149-3-rppt@kernel.org
 2021-06-07 11:12:25 +02:00
Joerg Roedel
b1e650db2c iommu/amd: Add amd_iommu=force_enable option 
Add this option to enable the IOMMU on platforms like AMD Stoney,
where the kernel usually disables it because it may cause problems in
some scenarios.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://lore.kernel.org/r/20210603130203.29016-1-joro@8bytes.org
 2021-06-04 16:31:13 +02:00
Ingo Molnar
a9e906b71f Merge branch 'sched/urgent' into sched/core, to pick up fixes 
Signed-off-by: Ingo Molnar <mingo@kernel.org>
 2021-06-03 19:00:49 +02:00
Mauro Carvalho Chehab
98b9c7890b docs: admin-guide: media: ipu3.rst: replace some characters 
The conversion tools used during DocBook/LaTeX/html/Markdown->ReST
conversion and some cut-and-pasted text contain some characters that
aren't easily reachable on standard keyboards and/or could cause
troubles when parsed by the documentation build system.

Replace the occurences of the following characters:

	- U+201c ('“'): LEFT DOUBLE QUOTATION MARK
	- U+201d ('”'): RIGHT DOUBLE QUOTATION MARK

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
 2021-06-02 15:06:12 +02:00
Sakari Ailus
dc794d3d24 media: staging: ipu3-imgu: Move the UAPI header from include under include/uapi 
The header defines the user space interface but may be mistaken as
kernel-only header due to its location. Add "uapi" directory under
driver's include directory and move the header there.

Suggested-by: Greg KH <gregkh@linuxfoundation.org>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Reviewed-by: Bingbu Cao <bingbu.cao@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
 2021-06-02 11:47:16 +02:00
Rajmohan Mani
3fb10ea4ce thunderbolt: Add support for retimer NVM upgrade when there is no link 
With help from platform firmware (ACPI) it is possible to power on
retimers even when there is no USB4 link (e.g nothing is connected to
the USB4 ports). This allows us to bring the USB4 sideband up so that we
can access retimers and upgrade their NVM firmware.

If the platform has support for this, we expose two additional
attributes under USB4 ports: offline and rescan. These can be used to
bring the port offline, rescan for the retimers and put the port online
again. The retimer NVM upgrade itself works the same way than with cable
connected.

Signed-off-by: Rajmohan Mani <rajmohan.mani@intel.com>
Co-developed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2021-06-01 10:53:31 +03:00
Greg Kroah-Hartman
910cc95373 Merge 5.13-rc4 into tty-next 
We need the tty/serial fixes in here as well.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2021-05-31 09:44:28 +02:00
Barry Song
544ef682c6 docs: kernel-parameters: mark numa=off is supported by a bundle of architectures 
risc-v and arm64 support numa=off by common arch_numa_init()
in drivers/base/arch_numa.c. x86, ppc, mips, sparc support it
by arch-level early_param.
numa=off is widely used in linux distributions. it is better
to document it.

Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Link: https://lore.kernel.org/r/20210524051715.13604-1-song.bao.hua@hisilicon.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-05-27 10:11:39 -06:00
Linus Torvalds
d7c5303fbc Networking fixes for 5.13-rc4, including fixes from bpf, netfilter, 
can and wireless trees. Notably including fixes for the recently
 announced "FragAttacks" WiFi vulnerabilities. Rather large batch,
 touching some core parts of the stack, too, but nothing hair-raising.
 
 Current release - regressions:
 
  - tipc: make node link identity publish thread safe
 
  - dsa: felix: re-enable TAS guard band mode
 
  - stmmac: correct clocks enabled in stmmac_vlan_rx_kill_vid()
 
  - stmmac: fix system hang if change mac address after interface ifdown
 
 Current release - new code bugs:
 
  - mptcp: avoid OOB access in setsockopt()
 
  - bpf: Fix nested bpf_bprintf_prepare with more per-cpu buffers
 
  - ethtool: stats: fix a copy-paste error - init correct array size
 
 Previous releases - regressions:
 
  - sched: fix packet stuck problem for lockless qdisc
 
  - net: really orphan skbs tied to closing sk
 
  - mlx4: fix EEPROM dump support
 
  - bpf: fix alu32 const subreg bound tracking on bitwise operations
 
  - bpf: fix mask direction swap upon off reg sign change
 
  - bpf, offload: reorder offload callback 'prepare' in verifier
 
  - stmmac: Fix MAC WoL not working if PHY does not support WoL
 
  - packetmmap: fix only tx timestamp on request
 
  - tipc: skb_linearize the head skb when reassembling msgs
 
 Previous releases - always broken:
 
  - mac80211: address recent "FragAttacks" vulnerabilities
 
  - mac80211: do not accept/forward invalid EAPOL frames
 
  - mptcp: avoid potential error message floods
 
  - bpf, ringbuf: deny reserve of buffers larger than ringbuf to prevent
                  out of buffer writes
 
  - bpf: forbid trampoline attach for functions with variable arguments
 
  - bpf: add deny list of functions to prevent inf recursion of tracing
         programs
 
  - tls splice: check SPLICE_F_NONBLOCK instead of MSG_DONTWAIT
 
  - can: isotp: prevent race between isotp_bind() and isotp_setsockopt()
 
  - netfilter: nft_set_pipapo_avx2: Add irq_fpu_usable() check,
               fallback to non-AVX2 version
 
 Misc:
 
  - bpf: add kconfig knob for disabling unpriv bpf by default
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Merge tag 'net-5.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Pull networking fixes from Jakub Kicinski:
 "Networking fixes for 5.13-rc4, including fixes from bpf, netfilter,
  can and wireless trees. Notably including fixes for the recently
  announced "FragAttacks" WiFi vulnerabilities. Rather large batch,
  touching some core parts of the stack, too, but nothing hair-raising.

  Current release - regressions:

   - tipc: make node link identity publish thread safe

   - dsa: felix: re-enable TAS guard band mode

   - stmmac: correct clocks enabled in stmmac_vlan_rx_kill_vid()

   - stmmac: fix system hang if change mac address after interface
     ifdown

  Current release - new code bugs:

   - mptcp: avoid OOB access in setsockopt()

   - bpf: Fix nested bpf_bprintf_prepare with more per-cpu buffers

   - ethtool: stats: fix a copy-paste error - init correct array size

  Previous releases - regressions:

   - sched: fix packet stuck problem for lockless qdisc

   - net: really orphan skbs tied to closing sk

   - mlx4: fix EEPROM dump support

   - bpf: fix alu32 const subreg bound tracking on bitwise operations

   - bpf: fix mask direction swap upon off reg sign change

   - bpf, offload: reorder offload callback 'prepare' in verifier

   - stmmac: Fix MAC WoL not working if PHY does not support WoL

   - packetmmap: fix only tx timestamp on request

   - tipc: skb_linearize the head skb when reassembling msgs

  Previous releases - always broken:

   - mac80211: address recent "FragAttacks" vulnerabilities

   - mac80211: do not accept/forward invalid EAPOL frames

   - mptcp: avoid potential error message floods

   - bpf, ringbuf: deny reserve of buffers larger than ringbuf to
     prevent out of buffer writes

   - bpf: forbid trampoline attach for functions with variable arguments

   - bpf: add deny list of functions to prevent inf recursion of tracing
     programs

   - tls splice: check SPLICE_F_NONBLOCK instead of MSG_DONTWAIT

   - can: isotp: prevent race between isotp_bind() and
     isotp_setsockopt()

   - netfilter: nft_set_pipapo_avx2: Add irq_fpu_usable() check,
     fallback to non-AVX2 version

  Misc:

   - bpf: add kconfig knob for disabling unpriv bpf by default"

* tag 'net-5.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (172 commits)
  net: phy: Document phydev::dev_flags bits allocation
  mptcp: validate 'id' when stopping the ADD_ADDR retransmit timer
  mptcp: avoid error message on infinite mapping
  mptcp: drop unconditional pr_warn on bad opt
  mptcp: avoid OOB access in setsockopt()
  nfp: update maintainer and mailing list addresses
  net: mvpp2: add buffer header handling in RX
  bnx2x: Fix missing error code in bnx2x_iov_init_one()
  net: zero-initialize tc skb extension on allocation
  net: hns: Fix kernel-doc
  sctp: fix the proc_handler for sysctl encap_port
  sctp: add the missing setting for asoc encap_port
  bpf, selftests: Adjust few selftest result_unpriv outcomes
  bpf: No need to simulate speculative domain for immediates
  bpf: Fix mask direction swap upon off reg sign change
  bpf: Wrap aux data inside bpf_sanitize_info container
  bpf: Fix BPF_LSM kconfig symbol dependency
  selftests/bpf: Add test for l3 use of bpf_redirect_peer
  bpftool: Add sock_release help info for cgroup attach/prog load command
  net: dsa: microchip: enable phy errata workaround on 9567
  ...
 2021-05-26 17:44:49 -10:00
Tejun Heo
c2a1197154 Merge branch 'for-5.13-fixes' into for-5.14 2021-05-24 13:43:56 -04:00
zhangyi (F)
51fd43e280 block_dump: remove comments in docs 
Now block_dump feature is gone, remove all comments in docs.

Signed-off-by: zhangyi (F) <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210313030146.2882027-4-yi.zhang@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2021-05-24 06:47:21 -06:00
Rafael J. Wysocki
c3d175e485 cpufreq: intel_pstate: hybrid: Avoid exposing two global attributes 
The turbo_pct and num_pstates sysfs attributes represent CPU
properties that may be different for differenty types of CPUs in
a hybrid processor, so avoid exposing them in that case.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
 2021-05-21 18:44:55 +02:00
Stafford Horne
4bc2bd5aef serial: liteuart: Add support for earlycon 
Most litex boards using RISC-V soft cores us the sbi earlycon, however
this is not available for non RISC-V litex SoC's.  This patch enables
earlycon for liteuart which is available on all Litex SoC's making
support for earycon debugging more widely available.

Cc: Florent Kermarrec <florent@enjoy-digital.fr>
Cc: Mateusz Holenko <mholenko@antmicro.com>
Cc: Joel Stanley <joel@jms.id.au>
Cc: Gabriel L. Somlo <gsomlo@gmail.com>
Reviewed-and-tested-by: Gabriel Somlo <gsomlo@gmail.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Stafford Horne <shorne@gmail.com>
Link: https://lore.kernel.org/r/20210517115453.24365-1-shorne@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2021-05-20 16:35:01 +02:00
Paul E. McKenney
641faf1b90 Merge branches 'bitmaprange.2021.05.10c', 'doc.2021.05.10c', 'fixes.2021.05.13a', 'kvfree_rcu.2021.05.10c', 'mmdumpobj.2021.05.10c', 'nocb.2021.05.12a', 'srcu.2021.05.12a', 'tasks.2021.05.18a' and 'torture.2021.05.10c' into HEAD 
bitmaprange.2021.05.10c: Allow "all" for bitmap ranges.
doc.2021.05.10c: Documentation updates.
fixes.2021.05.13a: Miscellaneous fixes.
kvfree_rcu.2021.05.10c: kvfree_rcu() updates.
mmdumpobj.2021.05.10c: mem_dump_obj() updates.
nocb.2021.05.12a: RCU NOCB CPU updates, including limited deoffloading.
srcu.2021.05.12a: SRCU updates.
tasks.2021.05.18a: Tasks-RCU updates.
torture.2021.05.10c: Torture-test updates.
 2021-05-18 10:56:19 -07:00
Fenghua Yu
9d839c280b Documentation/admin-guide: Add bus lock ratelimit 
Since bus lock rate limit changes the split_lock_detect parameter,
update the documentation for the change.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/r/20210419214958.4035512-4-fenghua.yu@intel.com
 2021-05-18 16:39:31 +02:00
Mel Gorman
fcb5017045 delayacct: Document task_delayacct sysctl 
Update sysctl/kernel.rst.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20210512114035.GH3672@suse.de
 2021-05-18 12:53:53 +02:00
Rasmus Villemoes
f4d3f25ace docs: admin-guide: update description for kernel.modprobe sysctl 
When I added CONFIG_MODPROBE_PATH, I neglected to update Documentation/.
It's still true that this defaults to /sbin/modprobe, but now via a level
of indirection.  So document that the kernel might have been built with
something other than /sbin/modprobe as the initial value.

Link: https://lkml.kernel.org/r/20210420125324.1246826-1-linux@rasmusvillemoes.dk
Fixes: 17652f4240 ("modules: add CONFIG_MODPROBE_PATH")
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-05-14 19:41:32 -07:00
Rasmus Villemoes
1e886090ce docs: admin-guide: update description for kernel.hotplug sysctl 
It's been a few releases since this defaulted to /sbin/hotplug. Update
the text, and include pointers to the two CONFIG_UEVENT_HELPER{,_PATH}
config knobs whose help text could provide more info, but also hint
that the user probably doesn't need to care at all.

Fixes: 7934779a69 ("Driver-Core: disable /sbin/hotplug by default")
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20210420120638.1104016-1-linux@rasmusvillemoes.dk
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-05-13 10:14:17 -06:00
Peter Zijlstra
e4042ad492 delayacct: Default disabled 
Assuming this stuff isn't actually used much; disable it by default
and avoid allocating and tracking the task_delay_info structure.

taskstats is changed to still report the regular sched and sched_info
and only skip the missing task_delay_info fields instead of not
reporting anything.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20210505111525.308018373@infradead.org
 2021-05-12 11:43:25 +02:00
David S. Miller
df6f823703 Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 
Daniel Borkmann says:

====================
pull-request: bpf 2021-05-11

The following pull-request contains BPF updates for your *net* tree.

We've added 13 non-merge commits during the last 8 day(s) which contain
a total of 21 files changed, 817 insertions(+), 382 deletions(-).

The main changes are:

1) Fix multiple ringbuf bugs in particular to prevent writable mmap of
   read-only pages, from Andrii Nakryiko & Thadeu Lima de Souza Cascardo.

2) Fix verifier alu32 known-const subregister bound tracking for bitwise
   operations and/or/xor, from Daniel Borkmann.

3) Reject trampoline attachment for functions with variable arguments,
   and also add a deny list of other forbidden functions, from Jiri Olsa.

4) Fix nested bpf_bprintf_prepare() calls used by various helpers by
   switching to per-CPU buffers, from Florent Revest.

5) Fix kernel compilation with BTF debug info on ppc64 due to pahole
   missing TCP-CC functions like cubictcp_init, from Martin KaFai Lau.

6) Add a kconfig entry to provide an option to disallow unprivileged
   BPF by default, from Daniel Borkmann.

7) Fix libbpf compilation for older libelf when GELF_ST_VISIBILITY()
   macro is not available, from Arnaldo Carvalho de Melo.

8) Migrate test_tc_redirect to test_progs framework as prep work
   for upcoming skb_change_head() fix & selftest, from Jussi Maki.

9) Fix a libbpf segfault in add_dummy_ksym_var() if BTF is not
   present, from Ian Rogers.

10) Fix tx_only micro-benchmark in xdpsock BPF sample with proper frame
    size, from Magnus Karlsson.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
 2021-05-11 16:05:56 -07:00
Daniel Borkmann
08389d8882 bpf: Add kconfig knob for disabling unpriv bpf by default 
Add a kconfig knob which allows for unprivileged bpf to be disabled by default.
If set, the knob sets /proc/sys/kernel/unprivileged_bpf_disabled to value of 2.

This still allows a transition of 2 -> {0,1} through an admin. Similarly,
this also still keeps 1 -> {1} behavior intact, so that once set to permanently
disabled, it cannot be undone aside from a reboot.

We've also added extra2 with max of 2 for the procfs handler, so that an admin
still has a chance to toggle between 0 <-> 2.

Either way, as an additional alternative, applications can make use of CAP_BPF
that we added a while ago.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/74ec548079189e4e4dffaeb42b8987bb3c852eee.1620765074.git.daniel@iogearbox.net
 2021-05-11 13:56:16 -07:00
Zhang Qiang
d0bfa8b3c4 kvfree_rcu: Release a page cache under memory pressure 
Add a drain_page_cache() function to drain a per-cpu page cache.
The reason behind of it is a system can run into a low memory
condition, in that case a page shrinker can ask for its users
to free their caches in order to get extra memory available for
other needs in a system.

When a system hits such condition, a page cache is drained for
all CPUs in a system. By default a page cache work is delayed
with 5 seconds interval until a memory pressure disappears, if
needed it can be changed. See a rcu_delay_page_cache_fill_msec
module parameter.

Co-developed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Zqiang <qiang.zhang@windriver.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
 2021-05-10 16:00:48 -07:00
Yury Norov
b18def121f bitmap_parse: Support 'all' semantics 
RCU code supports an 'all' group as a special case when parsing rcu_nocbs
parameter. This patch moves the 'all' support to the core bitmap_parse
code, so that all bitmap users can enjoy this extension.

Moving 'all' parsing to a bitmap_parse level also allows users to pass
patterns together with 'all' in regular group:pattern format, for example,
"rcu_nocbs=all:1/2" would offload all the even-numbered CPUs regardless
of the number of CPUs on the system.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Yury Norov <yury.norov@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
 2021-05-10 15:38:20 -07:00
Christian Brauner
340272b040 docs/cgroup: add entry for cgroup.kill 
Give a brief overview of the cgroup.kill functionality.

Link: https://lore.kernel.org/r/20210503143922.3093755-2-brauner@kernel.org
Cc: Roman Gushchin <guro@fb.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: cgroups@vger.kernel.org
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
 2021-05-10 10:41:10 -04:00
Michael Ellerman
f96271cefe Merge branch 'master' into next 
Merge master back into next, this allows us to resolve some conflicts in
arch/powerpc/Kconfig, and also re-sort the symbols under config PPC so
that they are in alphabetical order again.
 2021-05-08 21:12:55 +10:00
Linus Torvalds
a48b0872e6 Merge branch 'akpm' (patches from Andrew) 
Merge yet more updates from Andrew Morton:
 "This is everything else from -mm for this merge window.

  90 patches.

  Subsystems affected by this patch series: mm (cleanups and slub),
  alpha, procfs, sysctl, misc, core-kernel, bitmap, lib, compat,
  checkpatch, epoll, isofs, nilfs2, hpfs, exit, fork, kexec, gcov,
  panic, delayacct, gdb, resource, selftests, async, initramfs, ipc,
  drivers/char, and spelling"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (90 commits)
  mm: fix typos in comments
  mm: fix typos in comments
  treewide: remove editor modelines and cruft
  ipc/sem.c: spelling fix
  fs: fat: fix spelling typo of values
  kernel/sys.c: fix typo
  kernel/up.c: fix typo
  kernel/user_namespace.c: fix typos
  kernel/umh.c: fix some spelling mistakes
  include/linux/pgtable.h: few spelling fixes
  mm/slab.c: fix spelling mistake "disired" -> "desired"
  scripts/spelling.txt: add "overflw"
  scripts/spelling.txt: Add "diabled" typo
  scripts/spelling.txt: add "overlfow"
  arm: print alloc free paths for address in registers
  mm/vmalloc: remove vwrite()
  mm: remove xlate_dev_kmem_ptr()
  drivers/char: remove /dev/kmem for good
  mm: fix some typos and code style problems
  ipc/sem.c: mundane typo fixes
  ...
 2021-05-07 00:34:51 -07:00
David Hildenbrand
bbcd53c960 drivers/char: remove /dev/kmem for good 
Patch series "drivers/char: remove /dev/kmem for good".

Exploring /dev/kmem and /dev/mem in the context of memory hot(un)plug and
memory ballooning, I started questioning the existence of /dev/kmem.

Comparing it with the /proc/kcore implementation, it does not seem to be
able to deal with things like

a) Pages unmapped from the direct mapping (e.g., to be used by secretmem)
  -> kern_addr_valid(). virt_addr_valid() is not sufficient.

b) Special cases like gart aperture memory that is not to be touched
  -> mem_pfn_is_ram()

Unless I am missing something, it's at least broken in some cases and might
fault/crash the machine.

Looks like its existence has been questioned before in 2005 and 2010 [1],
after ~11 additional years, it might make sense to revive the discussion.

CONFIG_DEVKMEM is only enabled in a single defconfig (on purpose or by
mistake?).  All distributions disable it: in Ubuntu it has been disabled
for more than 10 years, in Debian since 2.6.31, in Fedora at least
starting with FC3, in RHEL starting with RHEL4, in SUSE starting from
15sp2, and OpenSUSE has it disabled as well.

1) /dev/kmem was popular for rootkits [2] before it got disabled
   basically everywhere. Ubuntu documents [3] "There is no modern user of
   /dev/kmem any more beyond attackers using it to load kernel rootkits.".
   RHEL documents in a BZ [5] "it served no practical purpose other than to
   serve as a potential security problem or to enable binary module drivers
   to access structures/functions they shouldn't be touching"

2) /proc/kcore is a decent interface to have a controlled way to read
   kernel memory for debugging puposes. (will need some extensions to
   deal with memory offlining/unplug, memory ballooning, and poisoned
   pages, though)

3) It might be useful for corner case debugging [1]. KDB/KGDB might be a
   better fit, especially, to write random memory; harder to shoot
   yourself into the foot.

4) "Kernel Memory Editor" [4] hasn't seen any updates since 2000 and seems
   to be incompatible with 64bit [1]. For educational purposes,
   /proc/kcore might be used to monitor value updates -- or older
   kernels can be used.

5) It's broken on arm64, and therefore, completely disabled there.

Looks like it's essentially unused and has been replaced by better
suited interfaces for individual tasks (/proc/kcore, KDB/KGDB). Let's
just remove it.

[1] https://lwn.net/Articles/147901/
[2] https://www.linuxjournal.com/article/10505
[3] https://wiki.ubuntu.com/Security/Features#A.2Fdev.2Fkmem_disabled
[4] https://sourceforge.net/projects/kme/
[5] https://bugzilla.redhat.com/show_bug.cgi?id=154796

Link: https://lkml.kernel.org/r/20210324102351.6932-1-david@redhat.com
Link: https://lkml.kernel.org/r/20210324102351.6932-2-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Alexander A. Klimov" <grandmaster@al2klimov.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Chris Zankel <chris@zankel.net>
Cc: Corentin Labbe <clabbe@baylibre.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Gregory Clement <gregory.clement@bootlin.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Helge Deller <deller@gmx.de>
Cc: Hillf Danton <hdanton@sina.com>
Cc: huang ying <huang.ying.caritas@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: James Troup <james.troup@canonical.com>
Cc: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kairui Song <kasong@redhat.com>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Niklas Schnelle <schnelle@linux.ibm.com>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>
Cc: openrisc@lists.librecores.org
Cc: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: "Pavel Machek (CIP)" <pavel@denx.de>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: Pierre Morel <pmorel@linux.ibm.com>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Richard Henderson <rth@twiddle.net>
Cc: Rich Felker <dalias@libc.org>
Cc: Robert Richter <rric@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Cc: sparclinux@vger.kernel.org
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Sudeep Holla <sudeep.holla@arm.com>
Cc: Theodore Dubois <tblodt@icloud.com>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: William Cohen <wcohen@redhat.com>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-05-07 00:26:34 -07:00
Rasmus Villemoes
e7cb072eb9 init/initramfs.c: do unpacking asynchronously 
Patch series "background initramfs unpacking, and CONFIG_MODPROBE_PATH", v3.

These two patches are independent, but better-together.

The second is a rather trivial patch that simply allows the developer to
change "/sbin/modprobe" to something else - e.g.  the empty string, so
that all request_module() during early boot return -ENOENT early, without
even spawning a usermode helper, needlessly synchronizing with the
initramfs unpacking.

The first patch delegates decompressing the initramfs to a worker thread,
allowing do_initcalls() in main.c to proceed to the device_ and late_
initcalls without waiting for that decompression (and populating of
rootfs) to finish.  Obviously, some of those later calls may rely on the
initramfs being available, so I've added synchronization points in the
firmware loader and usermodehelper paths - there might be other places
that would need this, but so far no one has been able to think of any
places I have missed.

There's not much to win if most of the functionality needed during boot is
only available as modules.  But systems with a custom-made .config and
initramfs can boot faster, partly due to utilizing more than one cpu
earlier, partly by avoiding known-futile modprobe calls (which would still
trigger synchronization with the initramfs unpacking, thus eliminating
most of the first benefit).

This patch (of 2):

Most of the boot process doesn't actually need anything from the
initramfs, until of course PID1 is to be executed.  So instead of doing
the decompressing and populating of the initramfs synchronously in
populate_rootfs() itself, push that off to a worker thread.

This is primarily motivated by an embedded ppc target, where unpacking
even the rather modest sized initramfs takes 0.6 seconds, which is long
enough that the external watchdog becomes unhappy that it doesn't get
attention soon enough.  By doing the initramfs decompression in a worker
thread, we get to do the device_initcalls and hence start petting the
watchdog much sooner.

Normal desktops might benefit as well.  On my mostly stock Ubuntu kernel,
my initramfs is a 26M xz-compressed blob, decompressing to around 126M.
That takes almost two seconds:

[    0.201454] Trying to unpack rootfs image as initramfs...
[    1.976633] Freeing initrd memory: 29416K

Before this patch, these lines occur consecutively in dmesg.  With this
patch, the timestamps on these two lines is roughly the same as above, but
with 172 lines inbetween - so more than one cpu has been kept busy doing
work that would otherwise only happen after the populate_rootfs()
finished.

Should one of the initcalls done after rootfs_initcall time (i.e., device_
and late_ initcalls) need something from the initramfs (say, a kernel
module or a firmware blob), it will simply wait for the initramfs
unpacking to be done before proceeding, which should in theory make this
completely safe.

But if some driver pokes around in the filesystem directly and not via one
of the official kernel interfaces (i.e.  request_firmware*(),
call_usermodehelper*) that theory may not hold - also, I certainly might
have missed a spot when sprinkling wait_for_initramfs().  So there is an
escape hatch in the form of an initramfs_async= command line parameter.

Link: https://lkml.kernel.org/r/20210313212528.2956377-1-linux@rasmusvillemoes.dk
Link: https://lkml.kernel.org/r/20210313212528.2956377-2-linux@rasmusvillemoes.dk
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-05-07 00:26:33 -07:00
Linus Torvalds
939b7cbc00 RISC-V Patches for the 5.13 Merge Window, Part 1 
* Support for the memtest= kernel command-line argument.
 * Support for building the kernel with FORTIFY_SOURCE.
 * Support for generic clockevent broadcasts.
 * Support for the buildtar build target.
 * Some build system cleanups to pass more LLVM-friendly arguments.
 * Support for kprobes.
 * A rearranged kernel memory map, the first part of supporting sv48
   systems.
 * Improvements to kexec, along with support for kdump and crash kernels.
 * An alternatives-based errata framework, along with support for
   handling a pair of errata that manifest on some SiFive designs
   (including the HiFive Unmatched).
 * Support for XIP.
 * A device tree for the Microchip PolarFire ICICLE SoC and associated
   dev board.
 
 Along with a bunch of cleanups.  There are already a handful of fixes
 on the list so there will likely be a part 2.
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Merge tag 'riscv-for-linus-5.13-mw0' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V updates from Palmer Dabbelt:

 - Support for the memtest= kernel command-line argument.

 - Support for building the kernel with FORTIFY_SOURCE.

 - Support for generic clockevent broadcasts.

 - Support for the buildtar build target.

 - Some build system cleanups to pass more LLVM-friendly arguments.

 - Support for kprobes.

 - A rearranged kernel memory map, the first part of supporting sv48
   systems.

 - Improvements to kexec, along with support for kdump and crash
   kernels.

 - An alternatives-based errata framework, along with support for
   handling a pair of errata that manifest on some SiFive designs
   (including the HiFive Unmatched).

 - Support for XIP.

 - A device tree for the Microchip PolarFire ICICLE SoC and associated
   dev board.

... along with a bunch of cleanups.  There are already a handful of fixes
on the list so there will likely be a part 2.

* tag 'riscv-for-linus-5.13-mw0' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux: (45 commits)
  RISC-V: Always define XIP_FIXUP
  riscv: Remove 32b kernel mapping from page table dump
  riscv: Fix 32b kernel build with CONFIG_DEBUG_VIRTUAL=y
  RISC-V: Fix error code returned by riscv_hartid_to_cpuid()
  RISC-V: Enable Microchip PolarFire ICICLE SoC
  RISC-V: Initial DTS for Microchip ICICLE board
  dt-bindings: riscv: microchip: Add YAML documentation for the PolarFire SoC
  RISC-V: Add Microchip PolarFire SoC kconfig option
  RISC-V: enable XIP
  RISC-V: Add crash kernel support
  RISC-V: Add kdump support
  RISC-V: Improve init_resources()
  RISC-V: Add kexec support
  RISC-V: Add EM_RISCV to kexec UAPI header
  riscv: vdso: fix and clean-up Makefile
  riscv/mm: Use BUG_ON instead of if condition followed by BUG.
  riscv/kprobe: fix kernel panic when invoking sys_read traced by kprobe
  riscv: Set ARCH_HAS_STRICT_MODULE_RWX if MMU
  riscv: module: Create module allocations without exec permissions
  riscv: bpf: Avoid breaking W^X
  ...
 2021-05-06 09:24:18 -07:00
Linus Torvalds
a3f53e8adf A few late-arriving documentation fixes, including some oprofile cleanup, a 
kernel-doc fix, some regression-reporting updates, and the usual minor
 fixes.
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Merge tag 'docs-5.13-2' of git://git.lwn.net/linux

Pull documentation fixes from Jonathan Corbet:
 "A few late-arriving documentation fixes, including some oprofile
  cleanup, a kernel-doc fix, some regression-reporting updates, and the
  usual minor fixes"

* tag 'docs-5.13-2' of git://git.lwn.net/linux:
  Enlisted oprofile version line removed
  oprofiled version output line removed from the list
  Removed the oprofiled version option
  docs: reporting-issues.rst: CC subsystem and maintainers on regressions
  docs: correct URL to bios and kernel developer's guide
  docs/core-api: Consistent code style
  docs/zh_CN: Adjust order and content of zh_CN/index.rst
  Documentation: input: joydev file corrections
  docs: Fix typo in Documentation/x86/x86_64/5level-paging.rst
  kernel-doc: Add support for __deprecated
 2021-05-06 08:33:54 -07:00
Linus Torvalds
8404c9fbc8 Merge branch 'akpm' (patches from Andrew) 
Merge more updates from Andrew Morton:
 "The remainder of the main mm/ queue.

  143 patches.

  Subsystems affected by this patch series (all mm): pagecache, hugetlb,
  userfaultfd, vmscan, compaction, migration, cma, ksm, vmstat, mmap,
  kconfig, util, memory-hotplug, zswap, zsmalloc, highmem, cleanups, and
  kfence"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (143 commits)
  kfence: use power-efficient work queue to run delayed work
  kfence: maximize allocation wait timeout duration
  kfence: await for allocation using wait_event
  kfence: zero guard page after out-of-bounds access
  mm/process_vm_access.c: remove duplicate include
  mm/mempool: minor coding style tweaks
  mm/highmem.c: fix coding style issue
  btrfs: use memzero_page() instead of open coded kmap pattern
  iov_iter: lift memzero_page() to highmem.h
  mm/zsmalloc: use BUG_ON instead of if condition followed by BUG.
  mm/zswap.c: switch from strlcpy to strscpy
  arm64/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
  x86/Kconfig: introduce ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
  mm,memory_hotplug: add kernel boot option to enable memmap_on_memory
  acpi,memhotplug: enable MHP_MEMMAP_ON_MEMORY when supported
  mm,memory_hotplug: allocate memmap from the added memory range
  mm,memory_hotplug: factor out adjusting present pages into adjust_present_page_count()
  mm,memory_hotplug: relax fully spanned sections check
  drivers/base/memory: introduce memory_block_{online,offline}
  mm/memory_hotplug: remove broken locking of zone PCP structures during hot remove
  ...
 2021-05-05 13:50:15 -07:00
Linus Torvalds
5d6a1b84e0 gpio updates for v5.13 
- new driver for the Realtek Otto GPIO controller
 - ACPI support for gpio-mpc8xxx
 - edge event support for gpio-sch (+ Kconfig fixes)
 - Kconfig improvements in gpio-ich
 - fixes to older issues in gpio-mockup
 - ACPI quirk for ignoring EC wakeups on Dell Venue 10 Pro 5055
 - improve the GPIO aggregator code by using more generic interfaces instead of
   reimplementing them in the driver
 - convert the DT bindings for gpio-74x164 to yaml
 - documentation improvements
 - a slew of other minor fixes and improvements to GPIO drivers
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Merge tag 'gpio-updates-for-v5.13-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

Pull gpio updates from Bartosz Golaszewski:

 - new driver for the Realtek Otto GPIO controller

 - ACPI support for gpio-mpc8xxx

 - edge event support for gpio-sch (+ Kconfig fixes)

 - Kconfig improvements in gpio-ich

 - fixes to older issues in gpio-mockup

 - ACPI quirk for ignoring EC wakeups on Dell Venue 10 Pro 5055

 - improve the GPIO aggregator code by using more generic interfaces
   instead of reimplementing them in the driver

 - convert the DT bindings for gpio-74x164 to yaml

 - documentation improvements

 - a slew of other minor fixes and improvements to GPIO drivers

* tag 'gpio-updates-for-v5.13-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux: (34 commits)
  dt-bindings: gpio: add YAML description for rockchip,gpio-bank
  gpio: mxs: remove useless function
  dt-bindings: gpio: fairchild,74hc595: Convert to json-schema
  gpio: it87: remove unused code
  gpio: 104-dio-48e: Fix coding style issues
  gpio: mpc8xxx: Add ACPI support
  gpio: ich: Switch to be dependent on LPC_ICH
  gpio: sch: Drop MFD_CORE selection
  gpio: sch: depends on LPC_SCH
  gpiolib: acpi: Add quirk to ignore EC wakeups on Dell Venue 10 Pro 5055
  gpio: sch: Hook into ACPI GPE handler to catch GPIO edge events
  gpio: sch: Add edge event support
  gpio: aggregator: Replace custom get_arg() with a generic next_arg()
  lib/cmdline: Export next_arg() for being used in modules
  gpio: omap: Use device_get_match_data() helper
  gpio: Add Realtek Otto GPIO support
  dt-bindings: gpio: Binding for Realtek Otto GPIO
  docs: kernel-parameters: Add gpio_mockup_named_lines
  docs: kernel-parameters: Move gpio-mockup for alphabetic order
  lib: bitmap: provide devm_bitmap_alloc() and devm_bitmap_zalloc()
  ...
 2021-05-05 12:39:29 -07:00
Oscar Salvador
e3a9d9fcc3 mm,memory_hotplug: add kernel boot option to enable memmap_on_memory 
Self stored memmap leads to a sparse memory situation which is
unsuitable for workloads that requires large contiguous memory chunks,
so make this an opt-in which needs to be explicitly enabled.

To control this, let memory_hotplug have its own memory space, as
suggested by David, so we can add memory_hotplug.memmap_on_memory
parameter.

Link: https://lkml.kernel.org/r/20210421102701.25051-7-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Pavel Tatashin <pasha.tatashin@soleen.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-05-05 11:27:27 -07:00
Pavel Tatashin
fa965fd548 memory-hotplug.rst: add a note about ZONE_MOVABLE and page pinning 
Document the special handling of page pinning when ZONE_MOVABLE present.

Link: https://lkml.kernel.org/r/20210215161349.246722-11-pasha.tatashin@soleen.com
Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Suggested-by: David Hildenbrand <david@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ira Weiny <ira.weiny@intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Sasha Levin <sashal@kernel.org>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Tyler Hicks <tyhicks@linux.microsoft.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-05-05 11:27:26 -07:00
Axel Rasmussen
b8da5cd4e5 userfaultfd: update documentation to describe minor fault handling 
Reword / reorganize things a little bit into "lists", so new features /
modes / ioctls can sort of just be appended.

Describe how UFFDIO_REGISTER_MODE_MINOR and UFFDIO_CONTINUE can be used to
intercept and resolve minor faults.  Make it clear that COPY and ZEROPAGE
are used for MISSING faults, whereas CONTINUE is used for MINOR faults.

Link: https://lkml.kernel.org/r/20210301222728.176417-6-axelrasmussen@google.com
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Cc: Adam Ruprecht <ruprecht@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Cannon Matthews <cannonmatthews@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chinwen Chang <chinwen.chang@mediatek.com>
Cc: David Rientjes <rientjes@google.com>
Cc: "Dr . David Alan Gilbert" <dgilbert@redhat.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Lokesh Gidra <lokeshgidra@google.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: "Michal Koutn" <mkoutny@suse.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Mina Almasry <almasrymina@google.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oliver Upton <oupton@google.com>
Cc: Shaohua Li <shli@fb.com>
Cc: Shawn Anastasio <shawn@anastas.io>
Cc: Steven Price <steven.price@arm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-05-05 11:27:23 -07:00
Alexander Dahl
6984a32034 docs: kernel-parameters: Add gpio_mockup_named_lines 
Missing since introduced in the driver.

Fixes: 8a68ea00a6 ("gpio: mockup: implement naming the lines")
Signed-off-by: Alexander Dahl <ada@thorsis.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
 2021-05-05 16:07:39 +02:00
Alexander Dahl
3eb52226de docs: kernel-parameters: Move gpio-mockup for alphabetic order 
All other sections are ordered alphabetically so do the same for
gpio-mockup.

Fixes: 0f98dd1b27 ("gpio/mockup: add virtual gpio device")
Signed-off-by: Alexander Dahl <ada@thorsis.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
 2021-05-05 16:07:39 +02:00
Nicholas Piggin
8abddd968a powerpc/64s/radix: Enable huge vmalloc mappings 
This reduces TLB misses by nearly 30x on a `git diff` workload on a
2-node POWER9 (59,800 -> 2,100) and reduces CPU cycles by 0.54%, due
to vfs hashes being allocated with 2MB pages.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210503091755.613393-1-npiggin@gmail.com
 2021-05-04 11:06:45 +10:00
Thorsten Leemhuis
0043f0b27a docs: reporting-issues.rst: CC subsystem and maintainers on regressions 
When reporting a regression, users ideally should CC the subsystem and
its maintainers, as that will ensure they get aware of the regression
quickly. And if the culprit is known, they should also CC everyone who
signed if off; the text mentioned the latter in once place already, but
forgot to do so in two other areas where it's relevant.

While fixing this also remind readers to check the mailing list archives
for issues that need to be reported to a bug tracker, as someone might
have reported it by mail only.

All of this got triggered by a recent report where these changes would
have made a difference.

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Link: https://lore.kernel.org/lkml/dff6badf-58f5-98c8-871c-94d901ac6919@leemhuis.info/
Link: https://lore.kernel.org/lkml/CAJZ5v0hX2StQVttAciHYH-urUH+Hi92z9z2ZbcNgQPt0E2Jpwg@mail.gmail.com/
Link: https://lore.kernel.org/r/dd13f10c30e79e550215e53a8103406daec4e593.1618482489.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-05-03 17:23:06 -06:00
Linus Torvalds
4f9701057a IOMMU Updates for Linux v5.13 
Including:
 
 	- Big cleanup of almost unsused parts of the IOMMU API by
 	  Christoph Hellwig. This mostly affects the Freescale PAMU
 	  driver.
 
 	- New IOMMU driver for Unisoc SOCs
 
 	- ARM SMMU Updates from Will:
 
 	  - SMMUv3: Drop vestigial PREFETCH_ADDR support
 	  - SMMUv3: Elide TLB sync logic for empty gather
 	  - SMMUv3: Fix "Service Failure Mode" handling
     	  - SMMUv2: New Qualcomm compatible string
 
 	- Removal of the AMD IOMMU performance counter writeable check
 	  on AMD. It caused long boot delays on some machines and is
 	  only needed to work around an errata on some older (possibly
 	  pre-production) chips. If someone is still hit by this
 	  hardware issue anyway the performance counters will just
 	  return 0.
 
 	- Support for targeted invalidations in the AMD IOMMU driver.
 	  Before that the driver only invalidated a single 4k page or the
 	  whole IO/TLB for an address space. This has been extended now
 	  and is mostly useful for emulated AMD IOMMUs.
 
 	- Several fixes for the Shared Virtual Memory support in the
 	  Intel VT-d driver
 
 	- Mediatek drivers can now be built as modules
 
 	- Re-introduction of the forcedac boot option which got lost
 	  when converting the Intel VT-d driver to the common dma-iommu
 	  implementation.
 
 	- Extension of the IOMMU device registration interface and
 	  support iommu_ops to be const again when drivers are built as
 	  modules.
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Merge tag 'iommu-updates-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu updates from Joerg Roedel:

 - Big cleanup of almost unsused parts of the IOMMU API by Christoph
   Hellwig. This mostly affects the Freescale PAMU driver.

 - New IOMMU driver for Unisoc SOCs

 - ARM SMMU Updates from Will:
     - Drop vestigial PREFETCH_ADDR support (SMMUv3)
     - Elide TLB sync logic for empty gather (SMMUv3)
     - Fix "Service Failure Mode" handling (SMMUv3)
     - New Qualcomm compatible string (SMMUv2)

 - Removal of the AMD IOMMU performance counter writeable check on AMD.
   It caused long boot delays on some machines and is only needed to
   work around an errata on some older (possibly pre-production) chips.
   If someone is still hit by this hardware issue anyway the performance
   counters will just return 0.

 - Support for targeted invalidations in the AMD IOMMU driver. Before
   that the driver only invalidated a single 4k page or the whole IO/TLB
   for an address space. This has been extended now and is mostly useful
   for emulated AMD IOMMUs.

 - Several fixes for the Shared Virtual Memory support in the Intel VT-d
   driver

 - Mediatek drivers can now be built as modules

 - Re-introduction of the forcedac boot option which got lost when
   converting the Intel VT-d driver to the common dma-iommu
   implementation.

 - Extension of the IOMMU device registration interface and support
   iommu_ops to be const again when drivers are built as modules.

* tag 'iommu-updates-v5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu: (84 commits)
  iommu: Streamline registration interface
  iommu: Statically set module owner
  iommu/mediatek-v1: Add error handle for mtk_iommu_probe
  iommu/mediatek-v1: Avoid build fail when build as module
  iommu/mediatek: Always enable the clk on resume
  iommu/fsl-pamu: Fix uninitialized variable warning
  iommu/vt-d: Force to flush iotlb before creating superpage
  iommu/amd: Put newline after closing bracket in warning
  iommu/vt-d: Fix an error handling path in 'intel_prepare_irq_remapping()'
  iommu/vt-d: Fix build error of pasid_enable_wpe() with !X86
  iommu/amd: Remove performance counter pre-initialization test
  Revert "iommu/amd: Fix performance counter initialization"
  iommu/amd: Remove duplicate check of devid
  iommu/exynos: Remove unneeded local variable initialization
  iommu/amd: Page-specific invalidations for more than one page
  iommu/arm-smmu-v3: Remove the unused fields for PREFETCH_CONFIG command
  iommu/vt-d: Avoid unnecessary cache flush in pasid entry teardown
  iommu/vt-d: Invalidate PASID cache when root/context entry changed
  iommu/vt-d: Remove WO permissions on second-level paging entries
  iommu/vt-d: Report the right page fault address
  ...
 2021-05-01 09:33:00 -07:00
Linus Torvalds
d42f323a7d Merge branch 'akpm' (patches from Andrew) 
Merge misc updates from Andrew Morton:
 "A few misc subsystems and some of MM.

  175 patches.

  Subsystems affected by this patch series: ia64, kbuild, scripts, sh,
  ocfs2, kfifo, vfs, kernel/watchdog, and mm (slab-generic, slub,
  kmemleak, debug, pagecache, msync, gup, memremap, memcg, pagemap,
  mremap, dma, sparsemem, vmalloc, documentation, kasan, initialization,
  pagealloc, and memory-failure)"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (175 commits)
  mm/memory-failure: unnecessary amount of unmapping
  mm/mmzone.h: fix existing kernel-doc comments and link them to core-api
  mm: page_alloc: ignore init_on_free=1 for debug_pagealloc=1
  net: page_pool: use alloc_pages_bulk in refill code path
  net: page_pool: refactor dma_map into own function page_pool_dma_map
  SUNRPC: refresh rq_pages using a bulk page allocator
  SUNRPC: set rq_page_end differently
  mm/page_alloc: inline __rmqueue_pcplist
  mm/page_alloc: optimize code layout for __alloc_pages_bulk
  mm/page_alloc: add an array-based interface to the bulk page allocator
  mm/page_alloc: add a bulk page allocator
  mm/page_alloc: rename alloced to allocated
  mm/page_alloc: duplicate include linux/vmalloc.h
  mm, page_alloc: avoid page_to_pfn() in move_freepages()
  mm/Kconfig: remove default DISCONTIGMEM_MANUAL
  mm: page_alloc: dump migrate-failed pages
  mm/mempolicy: fix mpol_misplaced kernel-doc
  mm/mempolicy: rewrite alloc_pages_vma documentation
  mm/mempolicy: rewrite alloc_pages documentation
  mm/mempolicy: rename alloc_pages_current to alloc_pages
  ...
 2021-04-30 14:38:01 -07:00
Linus Torvalds
c70a4be130 powerpc updates for 5.13 
- Enable KFENCE for 32-bit.
 
  - Implement EBPF for 32-bit.
 
  - Convert 32-bit to do interrupt entry/exit in C.
 
  - Convert 64-bit BookE to do interrupt entry/exit in C.
 
  - Changes to our signal handling code to use user_access_begin/end() more extensively.
 
  - Add support for time namespaces (CONFIG_TIME_NS)
 
  - A series of fixes that allow us to reenable STRICT_KERNEL_RWX.
 
  - Other smaller features, fixes & cleanups.
 
 Thanks to: Alexey Kardashevskiy, Andreas Schwab, Andrew Donnellan, Aneesh Kumar K.V,
   Athira Rajeev, Bhaskar Chowdhury, Bixuan Cui, Cédric Le Goater, Chen Huang, Chris
   Packham, Christophe Leroy, Christopher M. Riedl, Colin Ian King, Dan Carpenter, Daniel
   Axtens, Daniel Henrique Barboza, David Gibson, Davidlohr Bueso, Denis Efremov,
   dingsenjie, Dmitry Safonov, Dominic DeMarco, Fabiano Rosas, Ganesh Goudar, Geert
   Uytterhoeven, Geetika Moolchandani, Greg Kurz, Guenter Roeck, Haren Myneni, He Ying,
   Jiapeng Chong, Jordan Niethe, Laurent Dufour, Lee Jones, Leonardo Bras, Li Huafei,
   Madhavan Srinivasan, Mahesh Salgaonkar, Masahiro Yamada, Nathan Chancellor, Nathan
   Lynch, Nicholas Piggin, Oliver O'Halloran, Paul Menzel, Pu Lehui, Randy Dunlap, Ravi
   Bangoria, Rosen Penev, Russell Currey, Santosh Sivaraj, Sebastian Andrzej Siewior,
   Segher Boessenkool, Shivaprasad G Bhat, Srikar Dronamraju, Stephen Rothwell, Thadeu Lima
   de Souza Cascardo, Thomas Gleixner, Tony Ambardar, Tyrel Datwyler, Vaibhav Jain,
   Vincenzo Frascino, Xiongwei Song, Yang Li, Yu Kuai, Zhang Yunkai.
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Merge tag 'powerpc-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:

 - Enable KFENCE for 32-bit.

 - Implement EBPF for 32-bit.

 - Convert 32-bit to do interrupt entry/exit in C.

 - Convert 64-bit BookE to do interrupt entry/exit in C.

 - Changes to our signal handling code to use user_access_begin/end()
   more extensively.

 - Add support for time namespaces (CONFIG_TIME_NS)

 - A series of fixes that allow us to reenable STRICT_KERNEL_RWX.

 - Other smaller features, fixes & cleanups.

Thanks to Alexey Kardashevskiy, Andreas Schwab, Andrew Donnellan, Aneesh
Kumar K.V, Athira Rajeev, Bhaskar Chowdhury, Bixuan Cui, Cédric Le
Goater, Chen Huang, Chris Packham, Christophe Leroy, Christopher M.
Riedl, Colin Ian King, Dan Carpenter, Daniel Axtens, Daniel Henrique
Barboza, David Gibson, Davidlohr Bueso, Denis Efremov, dingsenjie,
Dmitry Safonov, Dominic DeMarco, Fabiano Rosas, Ganesh Goudar, Geert
Uytterhoeven, Geetika Moolchandani, Greg Kurz, Guenter Roeck, Haren
Myneni, He Ying, Jiapeng Chong, Jordan Niethe, Laurent Dufour, Lee
Jones, Leonardo Bras, Li Huafei, Madhavan Srinivasan, Mahesh Salgaonkar,
Masahiro Yamada, Nathan Chancellor, Nathan Lynch, Nicholas Piggin,
Oliver O'Halloran, Paul Menzel, Pu Lehui, Randy Dunlap, Ravi Bangoria,
Rosen Penev, Russell Currey, Santosh Sivaraj, Sebastian Andrzej Siewior,
Segher Boessenkool, Shivaprasad G Bhat, Srikar Dronamraju, Stephen
Rothwell, Thadeu Lima de Souza Cascardo, Thomas Gleixner, Tony Ambardar,
Tyrel Datwyler, Vaibhav Jain, Vincenzo Frascino, Xiongwei Song, Yang Li,
Yu Kuai, and Zhang Yunkai.

* tag 'powerpc-5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (302 commits)
  powerpc/signal32: Fix erroneous SIGSEGV on RT signal return
  powerpc: Avoid clang uninitialized warning in __get_user_size_allowed
  powerpc/papr_scm: Mark nvdimm as unarmed if needed during probe
  powerpc/kvm: Fix build error when PPC_MEM_KEYS/PPC_PSERIES=n
  powerpc/kasan: Fix shadow start address with modules
  powerpc/kernel/iommu: Use largepool as a last resort when !largealloc
  powerpc/kernel/iommu: Align size for IOMMU_PAGE_SIZE() to save TCEs
  powerpc/44x: fix spelling mistake in Kconfig "varients" -> "variants"
  powerpc/iommu: Annotate nested lock for lockdep
  powerpc/iommu: Do not immediately panic when failed IOMMU table allocation
  powerpc/iommu: Allocate it_map by vmalloc
  selftests/powerpc: remove unneeded semicolon
  powerpc/64s: remove unneeded semicolon
  powerpc/eeh: remove unneeded semicolon
  powerpc/selftests: Add selftest to test concurrent perf/ptrace events
  powerpc/selftests/perf-hwbreak: Add testcases for 2nd DAWR
  powerpc/selftests/perf-hwbreak: Coalesce event creation code
  powerpc/selftests/ptrace-hwbreak: Add testcases for 2nd DAWR
  powerpc/configs: Add IBMVNIC to some 64-bit configs
  selftests/powerpc: Add uaccess flush test
  ...
 2021-04-30 12:22:28 -07:00
Matthew Wilcox (Oracle)
84172f4bb7 mm/page_alloc: combine __alloc_pages and __alloc_pages_nodemask 
There are only two callers of __alloc_pages() so prune the thicket of
alloc_page variants by combining the two functions together.  Current
callers of __alloc_pages() simply add an extra 'NULL' parameter and
current callers of __alloc_pages_nodemask() call __alloc_pages() instead.

Link: https://lkml.kernel.org/r/20210225150642.2582252-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-04-30 11:20:42 -07:00
Rafael Aquini
82edd9d52e mm/slab_common: provide "slab_merge" option for !IS_ENABLED(CONFIG_SLAB_MERGE_DEFAULT) builds 
This is a minor addition to the allocator setup options to provide a
simple way to on demand enable back cache merging for builds that by
default run with CONFIG_SLAB_MERGE_DEFAULT not set.

Link: https://lkml.kernel.org/r/20210319194506.200159-1-aquini@redhat.com
Signed-off-by: Rafael Aquini <aquini@redhat.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 2021-04-30 11:20:36 -07:00
Linus Torvalds
9d31d23389 Networking changes for 5.13. 
Core:
 
  - bpf:
 	- allow bpf programs calling kernel functions (initially to
 	  reuse TCP congestion control implementations)
 	- enable task local storage for tracing programs - remove the
 	  need to store per-task state in hash maps, and allow tracing
 	  programs access to task local storage previously added for
 	  BPF_LSM
 	- add bpf_for_each_map_elem() helper, allowing programs to
 	  walk all map elements in a more robust and easier to verify
 	  fashion
 	- sockmap: support UDP and cross-protocol BPF_SK_SKB_VERDICT
 	  redirection
 	- lpm: add support for batched ops in LPM trie
 	- add BTF_KIND_FLOAT support - mostly to allow use of BTF
 	  on s390 which has floats in its headers files
 	- improve BPF syscall documentation and extend the use of kdoc
 	  parsing scripts we already employ for bpf-helpers
 	- libbpf, bpftool: support static linking of BPF ELF files
 	- improve support for encapsulation of L2 packets
 
  - xdp: restructure redirect actions to avoid a runtime lookup,
 	improving performance by 4-8% in microbenchmarks
 
  - xsk: build skb by page (aka generic zerocopy xmit) - improve
 	performance of software AF_XDP path by 33% for devices
 	which don't need headers in the linear skb part (e.g. virtio)
 
  - nexthop: resilient next-hop groups - improve path stability
 	on next-hops group changes (incl. offload for mlxsw)
 
  - ipv6: segment routing: add support for IPv4 decapsulation
 
  - icmp: add support for RFC 8335 extended PROBE messages
 
  - inet: use bigger hash table for IP ID generation
 
  - tcp: deal better with delayed TX completions - make sure we don't
 	give up on fast TCP retransmissions only because driver is
 	slow in reporting that it completed transmitting the original
 
  - tcp: reorder tcp_congestion_ops for better cache locality
 
  - mptcp:
 	- add sockopt support for common TCP options
 	- add support for common TCP msg flags
 	- include multiple address ids in RM_ADDR
 	- add reset option support for resetting one subflow
 
  - udp: GRO L4 improvements - improve 'forward' / 'frag_list'
 	co-existence with UDP tunnel GRO, allowing the first to take
 	place correctly	even for encapsulated UDP traffic
 
  - micro-optimize dev_gro_receive() and flow dissection, avoid
 	retpoline overhead on VLAN and TEB GRO
 
  - use less memory for sysctls, add a new sysctl type, to allow using
 	u8 instead of "int" and "long" and shrink networking sysctls
 
  - veth: allow GRO without XDP - this allows aggregating UDP
 	packets before handing them off to routing, bridge, OvS, etc.
 
  - allow specifing ifindex when device is moved to another namespace
 
  - netfilter:
 	- nft_socket: add support for cgroupsv2
 	- nftables: add catch-all set element - special element used
 	  to define a default action in case normal lookup missed
 	- use net_generic infra in many modules to avoid allocating
 	  per-ns memory unnecessarily
 
  - xps: improve the xps handling to avoid potential out-of-bound
 	accesses and use-after-free when XPS change race with other
 	re-configuration under traffic
 
  - add a config knob to turn off per-cpu netdev refcnt to catch
 	underflows in testing
 
 Device APIs:
 
  - add WWAN subsystem to organize the WWAN interfaces better and
    hopefully start driving towards more unified and vendor-
    -independent APIs
 
  - ethtool:
 	- add interface for reading IEEE MIB stats (incl. mlx5 and
 	  bnxt support)
 	- allow network drivers to dump arbitrary SFP EEPROM data,
 	  current offset+length API was a poor fit for modern SFP
 	  which define EEPROM in terms of pages (incl. mlx5 support)
 
  - act_police, flow_offload: add support for packet-per-second
 	policing (incl. offload for nfp)
 
  - psample: add additional metadata attributes like transit delay
 	for packets sampled from switch HW (and corresponding egress
 	and policy-based sampling in the mlxsw driver)
 
  - dsa: improve support for sandwiched LAGs with bridge and DSA
 
  - netfilter:
 	- flowtable: use direct xmit in topologies with IP
 	  forwarding, bridging, vlans etc.
 	- nftables: counter hardware offload support
 
  - Bluetooth:
 	- improvements for firmware download w/ Intel devices
 	- add support for reading AOSP vendor capabilities
 	- add support for virtio transport driver
 
  - mac80211:
 	- allow concurrent monitor iface and ethernet rx decap
 	- set priority and queue mapping for injected frames
 
  - phy: add support for Clause-45 PHY Loopback
 
  - pci/iov: add sysfs MSI-X vector assignment interface
 	to distribute MSI-X resources to VFs (incl. mlx5 support)
 
 New hardware/drivers:
 
  - dsa: mv88e6xxx: add support for Marvell mv88e6393x -
 	11-port Ethernet switch with 8x 1-Gigabit Ethernet
 	and 3x 10-Gigabit interfaces.
 
  - dsa: support for legacy Broadcom tags used on BCM5325, BCM5365
 	and BCM63xx switches
 
  - Microchip KSZ8863 and KSZ8873; 3x 10/100Mbps Ethernet switches
 
  - ath11k: support for QCN9074 a 802.11ax device
 
  - Bluetooth: Broadcom BCM4330 and BMC4334
 
  - phy: Marvell 88X2222 transceiver support
 
  - mdio: add BCM6368 MDIO mux bus controller
 
  - r8152: support RTL8153 and RTL8156 (USB Ethernet) chips
 
  - mana: driver for Microsoft Azure Network Adapter (MANA)
 
  - Actions Semi Owl Ethernet MAC
 
  - can: driver for ETAS ES58X CAN/USB interfaces
 
 Pure driver changes:
 
  - add XDP support to: enetc, igc, stmmac
  - add AF_XDP support to: stmmac
 
  - virtio:
 	- page_to_skb() use build_skb when there's sufficient tailroom
 	  (21% improvement for 1000B UDP frames)
 	- support XDP even without dedicated Tx queues - share the Tx
 	  queues with the stack when necessary
 
  - mlx5:
 	- flow rules: add support for mirroring with conntrack,
 	  matching on ICMP, GTP, flex filters and more
 	- support packet sampling with flow offloads
 	- persist uplink representor netdev across eswitch mode
 	  changes
 	- allow coexistence of CQE compression and HW time-stamping
 	- add ethtool extended link error state reporting
 
  - ice, iavf: support flow filters, UDP Segmentation Offload
 
  - dpaa2-switch:
 	- move the driver out of staging
 	- add spanning tree (STP) support
 	- add rx copybreak support
 	- add tc flower hardware offload on ingress traffic
 
  - ionic:
 	- implement Rx page reuse
 	- support HW PTP time-stamping
 
  - octeon: support TC hardware offloads - flower matching on ingress
 	and egress ratelimitting.
 
  - stmmac:
 	- add RX frame steering based on VLAN priority in tc flower
 	- support frame preemption (FPE)
 	- intel: add cross time-stamping freq difference adjustment
 
  - ocelot:
 	- support forwarding of MRP frames in HW
 	- support multiple bridges
 	- support PTP Sync one-step timestamping
 
  - dsa: mv88e6xxx, dpaa2-switch: offload bridge port flags like
 	learning, flooding etc.
 
  - ipa: add IPA v4.5, v4.9 and v4.11 support (Qualcomm SDX55, SM8350,
 	SC7280 SoCs)
 
  - mt7601u: enable TDLS support
 
  - mt76:
 	- add support for 802.3 rx frames (mt7915/mt7615)
 	- mt7915 flash pre-calibration support
 	- mt7921/mt7663 runtime power management fixes
 
 Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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Merge tag 'net-next-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:
 "Core:

   - bpf:
        - allow bpf programs calling kernel functions (initially to
          reuse TCP congestion control implementations)
        - enable task local storage for tracing programs - remove the
          need to store per-task state in hash maps, and allow tracing
          programs access to task local storage previously added for
          BPF_LSM
        - add bpf_for_each_map_elem() helper, allowing programs to walk
          all map elements in a more robust and easier to verify fashion
        - sockmap: support UDP and cross-protocol BPF_SK_SKB_VERDICT
          redirection
        - lpm: add support for batched ops in LPM trie
        - add BTF_KIND_FLOAT support - mostly to allow use of BTF on
          s390 which has floats in its headers files
        - improve BPF syscall documentation and extend the use of kdoc
          parsing scripts we already employ for bpf-helpers
        - libbpf, bpftool: support static linking of BPF ELF files
        - improve support for encapsulation of L2 packets

   - xdp: restructure redirect actions to avoid a runtime lookup,
     improving performance by 4-8% in microbenchmarks

   - xsk: build skb by page (aka generic zerocopy xmit) - improve
     performance of software AF_XDP path by 33% for devices which don't
     need headers in the linear skb part (e.g. virtio)

   - nexthop: resilient next-hop groups - improve path stability on
     next-hops group changes (incl. offload for mlxsw)

   - ipv6: segment routing: add support for IPv4 decapsulation

   - icmp: add support for RFC 8335 extended PROBE messages

   - inet: use bigger hash table for IP ID generation

   - tcp: deal better with delayed TX completions - make sure we don't
     give up on fast TCP retransmissions only because driver is slow in
     reporting that it completed transmitting the original

   - tcp: reorder tcp_congestion_ops for better cache locality

   - mptcp:
        - add sockopt support for common TCP options
        - add support for common TCP msg flags
        - include multiple address ids in RM_ADDR
        - add reset option support for resetting one subflow

   - udp: GRO L4 improvements - improve 'forward' / 'frag_list'
     co-existence with UDP tunnel GRO, allowing the first to take place
     correctly even for encapsulated UDP traffic

   - micro-optimize dev_gro_receive() and flow dissection, avoid
     retpoline overhead on VLAN and TEB GRO

   - use less memory for sysctls, add a new sysctl type, to allow using
     u8 instead of "int" and "long" and shrink networking sysctls

   - veth: allow GRO without XDP - this allows aggregating UDP packets
     before handing them off to routing, bridge, OvS, etc.

   - allow specifing ifindex when device is moved to another namespace

   - netfilter:
        - nft_socket: add support for cgroupsv2
        - nftables: add catch-all set element - special element used to
          define a default action in case normal lookup missed
        - use net_generic infra in many modules to avoid allocating
          per-ns memory unnecessarily

   - xps: improve the xps handling to avoid potential out-of-bound
     accesses and use-after-free when XPS change race with other
     re-configuration under traffic

   - add a config knob to turn off per-cpu netdev refcnt to catch
     underflows in testing

  Device APIs:

   - add WWAN subsystem to organize the WWAN interfaces better and
     hopefully start driving towards more unified and vendor-
     independent APIs

   - ethtool:
        - add interface for reading IEEE MIB stats (incl. mlx5 and bnxt
          support)
        - allow network drivers to dump arbitrary SFP EEPROM data,
          current offset+length API was a poor fit for modern SFP which
          define EEPROM in terms of pages (incl. mlx5 support)

   - act_police, flow_offload: add support for packet-per-second
     policing (incl. offload for nfp)

   - psample: add additional metadata attributes like transit delay for
     packets sampled from switch HW (and corresponding egress and
     policy-based sampling in the mlxsw driver)

   - dsa: improve support for sandwiched LAGs with bridge and DSA

   - netfilter:
        - flowtable: use direct xmit in topologies with IP forwarding,
          bridging, vlans etc.
        - nftables: counter hardware offload support

   - Bluetooth:
        - improvements for firmware download w/ Intel devices
        - add support for reading AOSP vendor capabilities
        - add support for virtio transport driver

   - mac80211:
        - allow concurrent monitor iface and ethernet rx decap
        - set priority and queue mapping for injected frames

   - phy: add support for Clause-45 PHY Loopback

   - pci/iov: add sysfs MSI-X vector assignment interface to distribute
     MSI-X resources to VFs (incl. mlx5 support)

  New hardware/drivers:

   - dsa: mv88e6xxx: add support for Marvell mv88e6393x - 11-port
     Ethernet switch with 8x 1-Gigabit Ethernet and 3x 10-Gigabit
     interfaces.

   - dsa: support for legacy Broadcom tags used on BCM5325, BCM5365 and
     BCM63xx switches

   - Microchip KSZ8863 and KSZ8873; 3x 10/100Mbps Ethernet switches

   - ath11k: support for QCN9074 a 802.11ax device

   - Bluetooth: Broadcom BCM4330 and BMC4334

   - phy: Marvell 88X2222 transceiver support

   - mdio: add BCM6368 MDIO mux bus controller

   - r8152: support RTL8153 and RTL8156 (USB Ethernet) chips

   - mana: driver for Microsoft Azure Network Adapter (MANA)

   - Actions Semi Owl Ethernet MAC

   - can: driver for ETAS ES58X CAN/USB interfaces

  Pure driver changes:

   - add XDP support to: enetc, igc, stmmac

   - add AF_XDP support to: stmmac

   - virtio:
        - page_to_skb() use build_skb when there's sufficient tailroom
          (21% improvement for 1000B UDP frames)
        - support XDP even without dedicated Tx queues - share the Tx
          queues with the stack when necessary

   - mlx5:
        - flow rules: add support for mirroring with conntrack, matching
          on ICMP, GTP, flex filters and more
        - support packet sampling with flow offloads
        - persist uplink representor netdev across eswitch mode changes
        - allow coexistence of CQE compression and HW time-stamping
        - add ethtool extended link error state reporting

   - ice, iavf: support flow filters, UDP Segmentation Offload

   - dpaa2-switch:
        - move the driver out of staging
        - add spanning tree (STP) support
        - add rx copybreak support
        - add tc flower hardware offload on ingress traffic

   - ionic:
        - implement Rx page reuse
        - support HW PTP time-stamping

   - octeon: support TC hardware offloads - flower matching on ingress
     and egress ratelimitting.

   - stmmac:
        - add RX frame steering based on VLAN priority in tc flower
        - support frame preemption (FPE)
        - intel: add cross time-stamping freq difference adjustment

   - ocelot:
        - support forwarding of MRP frames in HW
        - support multiple bridges
        - support PTP Sync one-step timestamping

   - dsa: mv88e6xxx, dpaa2-switch: offload bridge port flags like
     learning, flooding etc.

   - ipa: add IPA v4.5, v4.9 and v4.11 support (Qualcomm SDX55, SM8350,
     SC7280 SoCs)

   - mt7601u: enable TDLS support

   - mt76:
        - add support for 802.3 rx frames (mt7915/mt7615)
        - mt7915 flash pre-calibration support
        - mt7921/mt7663 runtime power management fixes"

* tag 'net-next-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2451 commits)
  net: selftest: fix build issue if INET is disabled
  net: netrom: nr_in: Remove redundant assignment to ns
  net: tun: Remove redundant assignment to ret
  net: phy: marvell: add downshift support for M88E1240
  net: dsa: ksz: Make reg_mib_cnt a u8 as it never exceeds 255
  net/sched: act_ct: Remove redundant ct get and check
  icmp: standardize naming of RFC 8335 PROBE constants
  bpf, selftests: Update array map tests for per-cpu batched ops
  bpf: Add batched ops support for percpu array
  bpf: Implement formatted output helpers with bstr_printf
  seq_file: Add a seq_bprintf function
  sfc: adjust efx->xdp_tx_queue_count with the real number of initialized queues
  net:nfc:digital: Fix a double free in digital_tg_recv_dep_req
  net: fix a concurrency bug in l2tp_tunnel_register()
  net/smc: Remove redundant assignment to rc
  mpls: Remove redundant assignment to err
  llc2: Remove redundant assignment to rc
  net/tls: Remove redundant initialization of record
  rds: Remove redundant assignment to nr_sig
  dt-bindings: net: mdio-gpio: add compatible for microchip,mdio-smi0
  ...
 2021-04-29 11:57:23 -07:00
Linus Torvalds
d2b6f8a179 New code for 5.13: 
- Various minor fixes in online scrub.
 - Prevent metadata files from being automatically inactivated.
 - Validate btree heights by the computed per-btree limits.
 - Don't warn about remounting with deprecated mount options.
 - Initialize attr forks at create time if we suspect we're going to need
   to store them.
 - Reduce memory reallocation workouts in the logging code.
 - Fix some theoretical math calculation errors in logged buffers that
   span multiple discontig memory ranges but contiguous ondisk regions.
 - Speedups in dirty buffer bitmap handling.
 - Make type verifier functions more inline-happy to reduce overhead.
 - Reduce debug overhead in directory checking code.
 - Many many typo fixes.
 - Begin to handle the permanent loss of the very end of a filesystem.
 - Fold struct xfs_icdinode into xfs_inode.
 - Deprecate the long defunct BMV_IF_NO_DMAPI_READ from the bmapx ioctl.
 - Remove a broken directory block format check from online scrub.
 - Fix a bug where we could produce an unnecessarily tall data fork btree
   when creating an attr fork.
 - Fix scrub and readonly remounts racing.
 - Fix a writeback ioend log deadlock problem by dropping the behavior
   where we could preallocate a setfilesize transaction.
 - Fix some bugs in the new extent count checking code.
 - Fix some bugs in the attr fork preallocation code.
 - Refactor if_flags out of the incore inode fork data structure.
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Merge tag 'xfs-5.13-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull xfs updates from Darrick Wong:
 "The notable user-visible addition this cycle is ability to remove
  space from the last AG in a filesystem. This is the first of many
  changes needed for full-fledged support for shrinking a filesystem.
  Still needed are (a) the ability to reorganize files and metadata away
  from the end of the fs; (b) the ability to remove entire allocation
  groups; (c) shrink support for realtime volumes; and (d) thorough
  testing of (a-c).

  There are a number of performance improvements in this code drop: Dave
  streamlined various parts of the buffer logging code and reduced the
  cost of various debugging checks, and added the ability to pre-create
  the xattr structures while creating files. Brian eliminated
  transaction reservations that were being held across writeback (thus
  reducing livelock potential.

  Other random pieces: Pavel fixed the repetitve warnings about
  deprecated mount options, I fixed online fsck to behave itself when a
  readonly remount comes in during scrub, and refactored various other
  parts of that code, Christoph contributed a lot of refactoring this
  cycle. The xfs_icdinode structure has been absorbed into the (incore)
  xfs_inode structure, and the format and flags handling around
  xfs_inode_fork structures has been simplified. Chandan provided a
  number of fixes for extent count overflow related problems that have
  been shaken out by debugging knobs added during 5.12.

  Summary:

   - Various minor fixes in online scrub.

   - Prevent metadata files from being automatically inactivated.

   - Validate btree heights by the computed per-btree limits.

   - Don't warn about remounting with deprecated mount options.

   - Initialize attr forks at create time if we suspect we're going to
     need to store them.

   - Reduce memory reallocation workouts in the logging code.

   - Fix some theoretical math calculation errors in logged buffers that
     span multiple discontig memory ranges but contiguous ondisk
     regions.

   - Speedups in dirty buffer bitmap handling.

   - Make type verifier functions more inline-happy to reduce overhead.

   - Reduce debug overhead in directory checking code.

   - Many many typo fixes.

   - Begin to handle the permanent loss of the very end of a filesystem.

   - Fold struct xfs_icdinode into xfs_inode.

   - Deprecate the long defunct BMV_IF_NO_DMAPI_READ from the bmapx
     ioctl.

   - Remove a broken directory block format check from online scrub.

   - Fix a bug where we could produce an unnecessarily tall data fork
     btree when creating an attr fork.

   - Fix scrub and readonly remounts racing.

   - Fix a writeback ioend log deadlock problem by dropping the behavior
     where we could preallocate a setfilesize transaction.

   - Fix some bugs in the new extent count checking code.

   - Fix some bugs in the attr fork preallocation code.

   - Refactor if_flags out of the incore inode fork data structure"

* tag 'xfs-5.13-merge-3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: (77 commits)
  xfs: remove xfs_quiesce_attr declaration
  xfs: remove XFS_IFEXTENTS
  xfs: remove XFS_IFINLINE
  xfs: remove XFS_IFBROOT
  xfs: only look at the fork format in xfs_idestroy_fork
  xfs: simplify xfs_attr_remove_args
  xfs: rename and simplify xfs_bmap_one_block
  xfs: move the XFS_IFEXTENTS check into xfs_iread_extents
  xfs: drop unnecessary setfilesize helper
  xfs: drop unused ioend private merge and setfilesize code
  xfs: open code ioend needs workqueue helper
  xfs: drop submit side trans alloc for append ioends
  xfs: fix return of uninitialized value in variable error
  xfs: get rid of the ip parameter to xchk_setup_*
  xfs: fix scrub and remount-ro protection when running scrub
  xfs: move the check for post-EOF mappings into xfs_can_free_eofblocks
  xfs: move the xfs_can_free_eofblocks call under the IOLOCK
  xfs: precalculate default inode attribute offset
  xfs: default attr fork size does not handle device inodes
  xfs: inode fork allocation depends on XFS_IFEXTENT flag
  ...
 2021-04-29 10:43:51 -07:00
Linus Torvalds
c05a182bf4 for-5.13/libata-2021-04-27 
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Merge tag 'for-5.13/libata-2021-04-27' of git://git.kernel.dk/linux-block

Pull libata updates from Jens Axboe:
 "Mostly cleanups this time, but also a few additions:

   - kernel-doc cleanups and sanitization (Lee)

   - Spelling fix (Bhaskar)

   - Fix ata_qc_from_tag() return value check in dwc_460ex (Dinghao)

   - Fall-through warning fix (Gustavo)

   - IRQ registration fixes (Sergey)

   - Add AHCI support for Tegra186 (Sowjanya)

   - Add xiling phy support for AHCI (Piyush)

   - SXS disable fix for AHCI for Hisilicon Kunpeng920 (Xingui)

   - pata legacy probe mask support (Maciej)"

* tag 'for-5.13/libata-2021-04-27' of git://git.kernel.dk/linux-block: (54 commits)
  libata: Fix fall-through warnings for Clang
  pata_ipx4xx_cf: Fix unsigned comparison with less than zero
  ata: ahci_tegra: call tegra_powergate_power_off only when PM domain is not present
  ata: ahci_tegra: Add AHCI support for Tegra186
  dt-binding: ata: tegra: Add dt-binding documentation for Tegra186
  dt-bindings: ata: tegra: Convert binding documentation to YAML
  pata_legacy: Add `probe_mask' parameter like with ide-generic
  pata_platform: Document `pio_mask' module parameter
  pata_legacy: Properly document module parameters
  ata: ahci: ceva: Updated code by using dev_err_probe()
  ata: ahci: Disable SXS for Hisilicon Kunpeng920
  ata: libahci_platform: fix IRQ check
  sata_mv: add IRQ checks
  ata: pata_acpi: Fix some incorrect function param descriptions
  ata: libata-acpi: Fix function name and provide description for 'prev_gtf'
  ata: sata_mv: Fix misnaming of 'mv_bmdma_stop()'
  ata: pata_cs5530: Fix misspelling of 'cs5530_init_one()'s 'pdev' param
  ata: pata_legacy: Repair a couple kernel-doc problems
  ata: ata_generic: Fix misspelling of 'ata_generic_init_one()'
  ata: pata_opti: Fix spelling issue of 'val' in 'opti_write_reg()'
  ...
 2021-04-28 14:50:20 -07:00
Linus Torvalds
16b3d0cf5b Scheduler updates for this cycle are: 
- Clean up SCHED_DEBUG: move the decades old mess of sysctl, procfs and debugfs interfaces
    to a unified debugfs interface.
 
  - Signals: Allow caching one sigqueue object per task, to improve performance & latencies.
 
  - Improve newidle_balance() irq-off latencies on systems with a large number of CPU cgroups.
 
  - Improve energy-aware scheduling
 
  - Improve the PELT metrics for certain workloads
 
  - Reintroduce select_idle_smt() to improve load-balancing locality - but without the previous
    regressions
 
  - Add 'scheduler latency debugging': warn after long periods of pending need_resched. This
    is an opt-in feature that requires the enabling of the LATENCY_WARN scheduler feature,
    or the use of the resched_latency_warn_ms=xx boot parameter.
 
  - CPU hotplug fixes for HP-rollback, and for the 'fail' interface. Fix remaining
    balance_push() vs. hotplug holes/races
 
  - PSI fixes, plus allow /proc/pressure/ files to be written by CAP_SYS_RESOURCE tasks as well
 
  - Fix/improve various load-balancing corner cases vs. capacity margins
 
  - Fix sched topology on systems with NUMA diameter of 3 or above
 
  - Fix PF_KTHREAD vs to_kthread() race
 
  - Minor rseq optimizations
 
  - Misc cleanups, optimizations, fixes and smaller updates
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'sched-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler updates from Ingo Molnar:

 - Clean up SCHED_DEBUG: move the decades old mess of sysctl, procfs and
   debugfs interfaces to a unified debugfs interface.

 - Signals: Allow caching one sigqueue object per task, to improve
   performance & latencies.

 - Improve newidle_balance() irq-off latencies on systems with a large
   number of CPU cgroups.

 - Improve energy-aware scheduling

 - Improve the PELT metrics for certain workloads

 - Reintroduce select_idle_smt() to improve load-balancing locality -
   but without the previous regressions

 - Add 'scheduler latency debugging': warn after long periods of pending
   need_resched. This is an opt-in feature that requires the enabling of
   the LATENCY_WARN scheduler feature, or the use of the
   resched_latency_warn_ms=xx boot parameter.

 - CPU hotplug fixes for HP-rollback, and for the 'fail' interface. Fix
   remaining balance_push() vs. hotplug holes/races

 - PSI fixes, plus allow /proc/pressure/ files to be written by
   CAP_SYS_RESOURCE tasks as well

 - Fix/improve various load-balancing corner cases vs. capacity margins

 - Fix sched topology on systems with NUMA diameter of 3 or above

 - Fix PF_KTHREAD vs to_kthread() race

 - Minor rseq optimizations

 - Misc cleanups, optimizations, fixes and smaller updates

* tag 'sched-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (61 commits)
  cpumask/hotplug: Fix cpu_dying() state tracking
  kthread: Fix PF_KTHREAD vs to_kthread() race
  sched/debug: Fix cgroup_path[] serialization
  sched,psi: Handle potential task count underflow bugs more gracefully
  sched: Warn on long periods of pending need_resched
  sched/fair: Move update_nohz_stats() to the CONFIG_NO_HZ_COMMON block to simplify the code & fix an unused function warning
  sched/debug: Rename the sched_debug parameter to sched_verbose
  sched,fair: Alternative sched_slice()
  sched: Move /proc/sched_debug to debugfs
  sched,debug: Convert sysctl sched_domains to debugfs
  debugfs: Implement debugfs_create_str()
  sched,preempt: Move preempt_dynamic to debug.c
  sched: Move SCHED_DEBUG sysctl to debugfs
  sched: Don't make LATENCYTOP select SCHED_DEBUG
  sched: Remove sched_schedstats sysctl out from under SCHED_DEBUG
  sched/numa: Allow runtime enabling/disabling of NUMA balance without SCHED_DEBUG
  sched: Use cpu_dying() to fix balance_push vs hotplug-rollback
  cpumask: Introduce DYING mask
  cpumask: Make cpu_{online,possible,present,active}() inline
  rseq: Optimise rseq_get_rseq_cs() and clear_rseq_cs()
  ...
 2021-04-28 13:33:57 -07:00
Linus Torvalds
0ff0edb550 Locking changes for this cycle were: 
- rtmutex cleanup & spring cleaning pass that removes ~400 lines of code
  - Futex simplifications & cleanups
  - Add debugging to the CSD code, to help track down a tenacious race (or hw problem)
  - Add lockdep_assert_not_held(), to allow code to require a lock to not be held,
    and propagate this into the ath10k driver
  - Misc LKMM documentation updates
  - Misc KCSAN updates: cleanups & documentation updates
  - Misc fixes and cleanups
  - Fix locktorture bugs with ww_mutexes
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'locking-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull locking updates from Ingo Molnar:

 - rtmutex cleanup & spring cleaning pass that removes ~400 lines of
   code

 - Futex simplifications & cleanups

 - Add debugging to the CSD code, to help track down a tenacious race
   (or hw problem)

 - Add lockdep_assert_not_held(), to allow code to require a lock to not
   be held, and propagate this into the ath10k driver

 - Misc LKMM documentation updates

 - Misc KCSAN updates: cleanups & documentation updates

 - Misc fixes and cleanups

 - Fix locktorture bugs with ww_mutexes

* tag 'locking-core-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (44 commits)
  kcsan: Fix printk format string
  static_call: Relax static_call_update() function argument type
  static_call: Fix unused variable warn w/o MODULE
  locking/rtmutex: Clean up signal handling in __rt_mutex_slowlock()
  locking/rtmutex: Restrict the trylock WARN_ON() to debug
  locking/rtmutex: Fix misleading comment in rt_mutex_postunlock()
  locking/rtmutex: Consolidate the fast/slowpath invocation
  locking/rtmutex: Make text section and inlining consistent
  locking/rtmutex: Move debug functions as inlines into common header
  locking/rtmutex: Decrapify __rt_mutex_init()
  locking/rtmutex: Remove pointless CONFIG_RT_MUTEXES=n stubs
  locking/rtmutex: Inline chainwalk depth check
  locking/rtmutex: Move rt_mutex_debug_task_free() to rtmutex.c
  locking/rtmutex: Remove empty and unused debug stubs
  locking/rtmutex: Consolidate rt_mutex_init()
  locking/rtmutex: Remove output from deadlock detector
  locking/rtmutex: Remove rtmutex deadlock tester leftovers
  locking/rtmutex: Remove rt_mutex_timed_lock()
  MAINTAINERS: Add myself as futex reviewer
  locking/mutex: Remove repeated declaration
  ...
 2021-04-28 12:37:53 -07:00
Linus Torvalds
9a45da9270 RCU changes for this cycle were: 
- Bitmap support for "N" as alias for last bit
  - kvfree_rcu updates
  - mm_dump_obj() updates.  (One of these is to mm, but was suggested by Andrew Morton.)
  - RCU callback offloading update
  - Polling RCU grace-period interfaces
  - Realtime-related RCU updates
  - Tasks-RCU updates
  - Torture-test updates
  - Torture-test scripting updates
  - Miscellaneous fixes
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
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Merge tag 'core-rcu-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull RCU updates from Ingo Molnar:

 - Support for "N" as alias for last bit in bitmap parsing library (eg
   using syntax like "nohz_full=2-N")

 - kvfree_rcu updates

 - mm_dump_obj() updates. (One of these is to mm, but was suggested by
   Andrew Morton.)

 - RCU callback offloading update

 - Polling RCU grace-period interfaces

 - Realtime-related RCU updates

 - Tasks-RCU updates

 - Torture-test updates

 - Torture-test scripting updates

 - Miscellaneous fixes

* tag 'core-rcu-2021-04-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (77 commits)
  rcutorture: Test start_poll_synchronize_rcu() and poll_state_synchronize_rcu()
  rcu: Provide polling interfaces for Tiny RCU grace periods
  torture: Fix kvm.sh --datestamp regex check
  torture: Consolidate qemu-cmd duration editing into kvm-transform.sh
  torture: Print proper vmlinux path for kvm-again.sh runs
  torture: Make TORTURE_TRUST_MAKE available in kvm-again.sh environment
  torture: Make kvm-transform.sh update jitter commands
  torture: Add --duration argument to kvm-again.sh
  torture: Add kvm-again.sh to rerun a previous torture-test
  torture: Create a "batches" file for build reuse
  torture: De-capitalize TORTURE_SUITE
  torture: Make upper-case-only no-dot no-slash scenario names official
  torture: Rename SRCU-t and SRCU-u to avoid lowercase characters
  torture: Remove no-mpstat error message
  torture: Record kvm-test-1-run.sh and kvm-test-1-run-qemu.sh PIDs
  torture: Record jitter start/stop commands
  torture: Extract kvm-test-1-run-qemu.sh from kvm-test-1-run.sh
  torture: Record TORTURE_KCONFIG_GDB_ARG in qemu-cmd
  torture: Abstract jitter.sh start/stop into scripts
  rcu: Provide polling interfaces for Tree RCU grace periods
  ...
 2021-04-28 12:00:13 -07:00
Linus Torvalds
55e6be657b Merge branch 'for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 
Pull cgroup changes from Tejun Heo:
 "The only notable change is Vipin's new misc cgroup controller.

  This implements generic support for resources which can be controlled
  by simply counting and limiting the number of resource instances - ie
  there's X number of these on the system and this cgroup subtree can
  have upto Y of those.

  The first user is the address space IDs used for virtual machine
  memory encryption and expected future usages are similar - niche
  hardware features with concrete resource limits and simple usage
  models"

* 'for-5.13' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
  cgroup: use tsk->in_iowait instead of delayacct_is_task_waiting_on_io()
  cgroup/cpuset: fix typos in comments
  cgroup: misc: mark dummy misc_cg_res_total_usage() static inline
  svm/sev: Register SEV and SEV-ES ASIDs to the misc controller
  cgroup: Miscellaneous cgroup documentation.
  cgroup: Add misc cgroup controller
 2021-04-27 18:47:42 -07:00
Linus Torvalds
288321a9c6 pstore update for v5.13-rc1 
- Add mem_type property to expand support for >2 memory types (Mukesh Ojha)
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Merge tag 'pstore-v5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull pstore update from Kees Cook:

 - Add mem_type property to expand support for >2 memory types (Mukesh Ojha)

* tag 'pstore-v5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  pstore: Add mem_type property DT parsing support
 2021-04-27 10:08:10 -07:00
Linus Torvalds
d8f9176b4e ACPI updates for 5.13-rc1 
- Update ACPICA code in the kernel to upstream revision 20210331
    including the following changes:
 
    * Add parsing for IVRS IVHD 40h and device entry F0h (Alexander
      Monakov).
 
    * Add new CEDT table for CXL 2.0 and iASL support for it (Ben
      Widawsky, Bob Moore).
 
    * NFIT: add Location Cookie field (Bob Moore).
 
    * HMAT: add new fields/flags (Bob Moore).
 
    * Add new flags in SRAT (Bob Moore).
 
    * PMTT: add new fields/structures (Bob Moore).
 
    * Add CSI2Bus resource template (Bob Moore).
 
    * iASL: Decode subtable type field for VIOT (Bob Moore).
 
    * Fix various typos and spelling mistakes (Colin Ian King).
 
    * Add new predefined objects _BPC, _BPS, and _BPT (Erik Kaneda).
 
    * Add USB4 capabilities UUID (Erik Kaneda).
 
    * Add CXL ACPI device ID and _CBR object (Erik Kaneda).
 
    * MADT: add Multiprocessor Wakeup Structure (Erik Kaneda).
 
    * PCCT: add support for subtable type 5 (Erik Kaneda).
 
    * PPTT: add new version of subtable type 1 (Erik Kaneda).
 
    * Add SDEV secure access components (Erik Kaneda).
 
    * Add support for PHAT table (Erik Kaneda).
 
    * iASL: Add definitions for the VIOT table (Jean-Philippe Brucker).
 
    * acpisrc: Add missing conversion for VIOT support (Jean-Philippe
      Brucker).
 
    * IORT: Updates for revision E.b (Shameer Kolothum).
 
  - Rearrange message printing in ACPI-related code to avoid using the
    ACPICA's internal message printing macros outside ACPICA and do
    some related code cleanups (Rafael Wysocki).
 
  - Modify the device enumeration code to turn off all of the unused
    ACPI power resources at the end (Rafael Wysocki).
 
  - Change the ACPI power resources handling code to turn off unused
    ACPI power resources without checking their status which should
    not be necessary by the spec (Rafael Wysocki).
 
  - Add empty stubs for CPPC-related functions to be used when
    CONFIG_ACPI_CPPC_LIB is not set (Rafael Wysocki).
 
  - Simplify device enumeration code (Rafael Wysocki).
 
  - Change device enumeration code to use match_string() for string
    matching (Andy Shevchenko).
 
  - Modify irqresource_disabled() to retain the resouce flags that
    have been set already (Angela Czubak).
 
  - Add native backlight whitelist entry for GA401/GA502/GA503 (Luke
    Jones).
 
  - Modify the ACPI backlight driver to let the native backlight
    handling take over on hardware-reduced systems (Hans de Goede).
 
  - Introduce acpi_dev_get() and switch over the ACPI core code to
    using it (Andy Shevchenko).
 
  - Use kobj_attribute as callback argument instead of a local struct
    type in the CPPC linrary code (Nathan Chancellor).
 
  - Drop unneeded initializatio of a static variable from the ACPI
    processor driver (Tian Tao).
 
  - Drop unnecessary local variable assignment from the ACPI APEI
    code (Colin Ian King).
 
  - Document for_each_acpi_dev_match() macro (Andy Shevchenko).
 
  - Address assorted coding style issues in multiple places (Xiaofei
    Tan).
 
  - Capitalize TLAs in a few comments (Andy Shevchenko).
 
  - Correct assorted typos in comments (Tom Saeger).
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Merge tag 'acpi-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull ACPI updates from Rafael Wysocki:
 "These update the ACPICA code in the kernel to the most recent upstream
  revision including (but not limited to) new material introduced in the
  6.4 version of the spec, update message printing in the ACPI-related
  code, address a few issues and clean up code in a number of places.

  Specifics:

   - Update ACPICA code in the kernel to upstream revision 20210331
     including the following changes:

      * Add parsing for IVRS IVHD 40h and device entry F0h (Alexander
        Monakov).

      * Add new CEDT table for CXL 2.0 and iASL support for it (Ben
        Widawsky, Bob Moore).

      * NFIT: add Location Cookie field (Bob Moore).

      * HMAT: add new fields/flags (Bob Moore).

      * Add new flags in SRAT (Bob Moore).

      * PMTT: add new fields/structures (Bob Moore).

      * Add CSI2Bus resource template (Bob Moore).

      * iASL: Decode subtable type field for VIOT (Bob Moore).

      * Fix various typos and spelling mistakes (Colin Ian King).

      * Add new predefined objects _BPC, _BPS, and _BPT (Erik Kaneda).

      * Add USB4 capabilities UUID (Erik Kaneda).

      * Add CXL ACPI device ID and _CBR object (Erik Kaneda).

      * MADT: add Multiprocessor Wakeup Structure (Erik Kaneda).

      * PCCT: add support for subtable type 5 (Erik Kaneda).

      * PPTT: add new version of subtable type 1 (Erik Kaneda).

      * Add SDEV secure access components (Erik Kaneda).

      * Add support for PHAT table (Erik Kaneda).

      * iASL: Add definitions for the VIOT table (Jean-Philippe
        Brucker).

      * acpisrc: Add missing conversion for VIOT support (Jean-Philippe
        Brucker).

      * IORT: Updates for revision E.b (Shameer Kolothum).

   - Rearrange message printing in ACPI-related code to avoid using the
     ACPICA's internal message printing macros outside ACPICA and do
     some related code cleanups (Rafael Wysocki).

   - Modify the device enumeration code to turn off all of the unused
     ACPI power resources at the end (Rafael Wysocki).

   - Change the ACPI power resources handling code to turn off unused
     ACPI power resources without checking their status which should not
     be necessary by the spec (Rafael Wysocki).

   - Add empty stubs for CPPC-related functions to be used when
     CONFIG_ACPI_CPPC_LIB is not set (Rafael Wysocki).

   - Simplify device enumeration code (Rafael Wysocki).

   - Change device enumeration code to use match_string() for string
     matching (Andy Shevchenko).

   - Modify irqresource_disabled() to retain the resouce flags that have
     been set already (Angela Czubak).

   - Add native backlight whitelist entry for GA401/GA502/GA503 (Luke
     Jones).

   - Modify the ACPI backlight driver to let the native backlight
     handling take over on hardware-reduced systems (Hans de Goede).

   - Introduce acpi_dev_get() and switch over the ACPI core code to
     using it (Andy Shevchenko).

   - Use kobj_attribute as callback argument instead of a local struct
     type in the CPPC linrary code (Nathan Chancellor).

   - Drop unneeded initializatio of a static variable from the ACPI
     processor driver (Tian Tao).

   - Drop unnecessary local variable assignment from the ACPI APEI code
     (Colin Ian King).

   - Document for_each_acpi_dev_match() macro (Andy Shevchenko).

   - Address assorted coding style issues in multiple places (Xiaofei
     Tan).

   - Capitalize TLAs in a few comments (Andy Shevchenko).

   - Correct assorted typos in comments (Tom Saeger)"

* tag 'acpi-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm: (68 commits)
  ACPI: video: use native backlight for GA401/GA502/GA503
  ACPI: APEI: remove redundant assignment to variable rc
  ACPI: utils: Capitalize abbreviations in the comments
  ACPI: utils: Document for_each_acpi_dev_match() macro
  ACPI: bus: Introduce acpi_dev_get() and reuse it in ACPI code
  ACPI: scan: Utilize match_string() API
  resource: Prevent irqresource_disabled() from erasing flags
  ACPI: CPPC: Replace cppc_attr with kobj_attribute
  ACPI: scan: Call acpi_get_object_info() from acpi_set_pnp_ids()
  ACPI: scan: Drop sta argument from acpi_init_device_object()
  ACPI: scan: Drop sta argument from acpi_add_single_object()
  ACPI: scan: Rearrange checks in acpi_bus_check_add()
  ACPI: scan: Fold acpi_bus_type_and_status() into its caller
  ACPI: video: Check LCD flag on ACPI-reduced-hardware devices
  ACPI: utils: Add acpi_reduced_hardware() helper
  ACPI: dock: fix some coding style issues
  ACPI: sysfs: fix some coding style issues
  ACPI: PM: add a missed blank line after declarations
  ACPI: custom_method: fix a coding style issue
  ACPI: CPPC: fix some coding style issues
  ...
 2021-04-26 15:03:23 -07:00
Linus Torvalds
2a19866b6e 40 cifs/smb3 changesets, including 4 for stable 
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Merge tag '5.12-rc-smb3-fixes-part1' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs updates from Steve French:

 - improvements to root directory metadata caching

 - addition of new "rasize" mount parameter which can significantly
   increase read ahead performance (e.g. copy can be much faster,
   especially with multichannel)

 - addition of support for insert and collapse range

 - improvements to error handling in mount

* tag '5.12-rc-smb3-fixes-part1' of git://git.samba.org/sfrench/cifs-2.6: (40 commits)
  cifs: update internal version number
  smb3: add rasize mount parameter to improve readahead performance
  smb3: limit noisy error
  cifs: fix leak in cifs_smb3_do_mount() ctx
  cifs: remove unnecessary copies of tcon->crfid.fid
  cifs: Return correct error code from smb2_get_enc_key
  cifs: fix out-of-bound memory access when calling smb3_notify() at mount point
  smb2: fix use-after-free in smb2_ioctl_query_info()
  cifs: export supported mount options via new mount_params /proc file
  cifs: log mount errors using cifs_errorf()
  cifs: add fs_context param to parsing helpers
  cifs: make fs_context error logging wrapper
  cifs: add FALLOC_FL_INSERT_RANGE support
  cifs: add support for FALLOC_FL_COLLAPSE_RANGE
  cifs: check the timestamp for the cached dirent when deciding on revalidate
  cifs: pass the dentry instead of the inode down to the revalidation check functions
  cifs: add a timestamp to track when the lease of the cached dir was taken
  cifs: add a function to get a cached dir based on its dentry
  cifs: Grab a reference for the dentry of the cached directory during the lifetime of the cache
  cifs: store a pointer to the root dentry in cifs_sb_info once we have completed mounting the share
  ...
 2021-04-26 13:41:30 -07:00
Linus Torvalds
2f9ef0559e It's been a relatively busy cycle in docsland, though more than usually 
well contained to Documentation/ itself.  Highlights include:
 
  - The Chinese translators have been busy and show no signs of stopping
    anytime soon.  Italian has also caught up.
 
  - Aditya Srivastava has been working on improvements to the kernel-doc
    script.
 
  - Thorsten continues his work on reporting-issues.rst and related
    documentation around regression reporting.
 
  - Lots of documentation updates, typo fixes, etc. as usual
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Merge tag 'docs-5.13' of git://git.lwn.net/linux

Pull documentation updates from Jonathan Corbet:
 "It's been a relatively busy cycle in docsland, though more than
  usually well contained to Documentation/ itself. Highlights include:

   - The Chinese translators have been busy and show no signs of
     stopping anytime soon. Italian has also caught up.

   - Aditya Srivastava has been working on improvements to the
     kernel-doc script.

   - Thorsten continues his work on reporting-issues.rst and related
     documentation around regression reporting.

   - Lots of documentation updates, typo fixes, etc. as usual"

* tag 'docs-5.13' of git://git.lwn.net/linux: (139 commits)
  docs/zh_CN: add openrisc translation to zh_CN index
  docs/zh_CN: add openrisc index.rst translation
  docs/zh_CN: add openrisc todo.rst translation
  docs/zh_CN: add openrisc openrisc_port.rst translation
  docs/zh_CN: add core api translation to zh_CN index
  docs/zh_CN: add core-api index.rst translation
  docs/zh_CN: add core-api irq index.rst translation
  docs/zh_CN: add core-api irq irqflags-tracing.rst translation
  docs/zh_CN: add core-api irq irq-domain.rst translation
  docs/zh_CN: add core-api irq irq-affinity.rst translation
  docs/zh_CN: add core-api irq concepts.rst translation
  docs: sphinx-pre-install: don't barf on beta Sphinx releases
  scripts: kernel-doc: improve parsing for kernel-doc comments syntax
  docs/zh_CN: two minor fixes in zh_CN/doc-guide/
  Documentation: dev-tools: Add Testing Overview
  docs/zh_CN: add translations in zh_CN/dev-tools/gcov
  docs: reporting-issues: make people CC the regressions list
  MAINTAINERS: add regressions mailing list
  doc:it_IT: align Italian documentation
  docs/zh_CN: sync reporting-issues.rst
  ...
 2021-04-26 13:22:43 -07:00
Linus Torvalds
d08410d8c9 TTY/Serial driver updates for 5.13-rc1 
Here is the big set of tty and serial driver updates for 5.13-rc1.
 
 Actually busy this release, with a number of cleanups happening:
 	- much needed core tty cleanups by Jiri Slaby
 	- removal of unused and orphaned old-style serial drivers.  If
 	  anyone shows up with this hardware, it is trivial to restore
 	  these but we really do not think they are in use anymore.
 	- fixes and cleanups from Johan Hovold on a number of termios
 	  setting corner cases that loads of drivers got wrong as well
 	  as removing unneeded code due to tty core changes from long
 	  ago that were never propagated out to the drivers
 	- loads of platform-specific serial port driver updates and
 	  fixes
 	- coding style cleanups and other small fixes and updates all
 	  over the tty/serial tree.
 
 All of these have been in linux-next for a while now with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty and serial driver updates from Greg KH:
 "Here is the big set of tty and serial driver updates for 5.13-rc1.

  Actually busy this release, with a number of cleanups happening:

   - much needed core tty cleanups by Jiri Slaby

   - removal of unused and orphaned old-style serial drivers. If anyone
     shows up with this hardware, it is trivial to restore these but we
     really do not think they are in use anymore.

   - fixes and cleanups from Johan Hovold on a number of termios setting
     corner cases that loads of drivers got wrong as well as removing
     unneeded code due to tty core changes from long ago that were never
     propagated out to the drivers

   - loads of platform-specific serial port driver updates and fixes

   - coding style cleanups and other small fixes and updates all over
     the tty/serial tree.

  All of these have been in linux-next for a while now with no reported
  issues"

* tag 'tty-5.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (186 commits)
  serial: extend compile-test coverage
  serial: stm32: add FIFO threshold configuration
  dt-bindings: serial: 8250: update TX FIFO trigger level
  dt-bindings: serial: stm32: override FIFO threshold properties
  dt-bindings: serial: add RX and TX FIFO properties
  serial: xilinx_uartps: drop low-latency workaround
  serial: vt8500: drop low-latency workaround
  serial: timbuart: drop low-latency workaround
  serial: sunsu: drop low-latency workaround
  serial: sifive: drop low-latency workaround
  serial: txx9: drop low-latency workaround
  serial: sa1100: drop low-latency workaround
  serial: rp2: drop low-latency workaround
  serial: rda: drop low-latency workaround
  serial: owl: drop low-latency workaround
  serial: msm_serial: drop low-latency workaround
  serial: mpc52xx_uart: drop low-latency workaround
  serial: meson: drop low-latency workaround
  serial: mcf: drop low-latency workaround
  serial: lpc32xx_hs: drop low-latency workaround
  ...
 2021-04-26 11:20:10 -07:00
Linus Torvalds
90035c28f1 platform-drivers-x86 for v5.13-1 
Highlights:
  - Lots of Microsoft Surface work
  - platform-profile support for HP and Microsoft Surface devices
  - New WMI Gigabyte motherboard temperature monitoring driver
  - Intel PMC improvements for Tiger Lake and Alder Lake
  - Misc. bugfixes, improvements and quirk additions all over
 
 The following is an automated git shortlog grouped by driver:
 
 Add support for DYTC MMC_GET BIOS API.:
  - Add support for DYTC MMC_GET BIOS API.
 
 Adjust Dell drivers to a personal email address:
  - Adjust Dell drivers to a personal email address
 
 Fix typo in Kconfig:
  - Fix typo in Kconfig
 
 ISST:
  -  Account for increased timeout in some cases
 
 MAINTAINERS:
  -  Add missing section for alienware-wmi driver
  -  Adjust Dell drivers to email alias
  -  update MELLANOX HARDWARE PLATFORM SUPPORT maintainers
 
 Merge tag 'ib-mfd-platform-x86-v5.13' into review-hans:
  - Merge tag 'ib-mfd-platform-x86-v5.13' into review-hans
 
 Merge tag 'irq-no-autoen-2021-03-25' into review-hans:
  - Merge tag 'irq-no-autoen-2021-03-25' into review-hans
 
 Typo fix in the file classmate-laptop.c:
  - Typo fix in the file classmate-laptop.c
 
 add Gigabyte WMI temperature driver:
  - add Gigabyte WMI temperature driver
 
 add support for Advantech software defined button:
  - add support for Advantech software defined button
 
 asus-laptop:
  -  fix kobj_to_dev.cocci warnings
 
 asus-wmi:
  -  Add param to turn fn-lock mode on by default
 
 dell-wmi-sysman:
  -  Make init_bios_attributes() ACPI object parsing more robust
  -  Cleanup create_attributes_level_sysfs_files()
  -  Make sysman_init() return -ENODEV of the interfaces are not found
  -  Cleanup sysman_init() error-exit handling
  -  Fix release_attributes_data() getting called twice on init_bios_attributes() failure
  -  Make it safe to call exit_foo_attributes() multiple times
  -  Fix possible NULL pointer deref on exit
  -  Fix crash caused by calling kset_unregister twice
 
 docs:
  -  driver-api: Add Surface DTX driver documentation
 
 genirq:
  -  Add IRQF_NO_AUTOEN for request_irq/nmi()
 
 gigabyte-wmi:
  -  add support for B550M AORUS PRO-P
  -  add X570 AORUS ELITE
 
 hp-wmi:
  -  add platform profile support
  -  rename "thermal policy" to "thermal profile"
 
 intel-hid:
  -  Fix spurious wakeups caused by tablet-mode events during suspend
  -  Support Lenovo ThinkPad X1 Tablet Gen 2
 
 intel-vbtn:
  -  Remove unused KEYMAP_LEN define
  -  Stop reporting SW_DOCK events
 
 intel_chtdc_ti_pwrbtn:
  -  Fix missing IRQF_ONESHOT as only threaded handler
 
 intel_pmc_core:
  -  Uninitialized data in pmc_core_lpm_latch_mode_write()
  -  add ACPI dependency
  -  Fix "unsigned 'ret' is never less than zero" smatch warning
  -  Add support for Alder Lake PCH-P
  -  Add LTR registers for Tiger Lake
  -  Add option to set/clear LPM mode
  -  Add requirements file to debugfs
  -  Get LPM requirements for Tiger Lake
  -  Show LPM residency in microseconds
  -  Handle sub-states generically
  -  Remove global struct pmc_dev
  -  Don't use global pmcdev in quirks
  -  export platform global reset bits via etr3 sysfs file
  -  Ignore GBE LTR on Tiger Lake platforms
  -  Update Kconfig
 
 intel_pmt_class:
  -  Initial resource to 0
 
 intel_pmt_crashlog:
  -  Fix incorrect macros
 
 mfd:
  -  intel_pmt: Add support for DG1
  -  intel_pmt: Fix nuisance messages and handling of disabled capabilities
 
 panasonic-laptop:
  -  remove redundant assignment of variable result
 
 platform:
  -  x86: ACPI: Get rid of ACPICA message printing
 
 platform/mellanox:
  -  mlxreg-hotplug: move to use request_irq by IRQF_NO_AUTOEN flag
  -  Typo fix in the file mlxbf-bootctl.c
 
 platform/surface:
  -  aggregator: fix a bit test
  -  aggregator: move to use request_irq by IRQF_NO_AUTOEN flag
  -  aggregator_registry: Give devices time to set up when connecting
  -  clean up a variable in surface_dtx_read()
  -  fix semicolon.cocci warnings
  -  aggregator_registry: Add support for Surface Pro 7+
  -  aggregator_registry: Make symbol 'ssam_base_hub_group' static
  -  dtx: Add support for native SSAM devices
  -  Add DTX driver
  -  aggregator: Make SSAM_DEFINE_SYNC_REQUEST_x define static functions
  -  Add platform profile driver
  -  aggregator_registry: Add HID subsystem devices
  -  aggregator_registry: Add DTX device
  -  aggregator_registry: Add platform profile device
  -  aggregator_registry: Add battery subsystem devices
  -  aggregator_registry: Add base device hub
  -  Set up Surface Aggregator device registry
 
 pmc_atom:
  -  Match all Beckhoff Automation baytrail boards with critclk_systems DMI table
 
 thinkpad_acpi:
  -  Add labels to the first 2 temperature sensors
  -  Correct thermal sensor allocation
  -  Correct minor typo
  -  sysfs interface to get wwan antenna type
  -  Disable DYTC CQL mode around switching to balanced mode
  -  Allow the FnLock LED to change state
  -  check dytc version for lapmode sysfs
  -  Handle keyboard cover attach/detach events
 
 tools/power/x86/intel-speed-select:
  -  v1.9 release
  -  Drop __DATE__ and __TIME__ macros
  -  Add options to force online
  -  Process mailbox read error for core-power
  -  Increase string size
 
 touchscreen_dmi:
  -  Add info for the Teclast Tbook 11 tablet
  -  Handle device properties with software node API
 
 wmi:
  -  Make remove callback return void
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Merge tag 'platform-drivers-x86-v5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86

Pull x86 platform driver updates freom Hans de Goede:

 - lots of Microsoft Surface work

 - platform-profile support for HP and Microsoft Surface devices

 - new WMI Gigabyte motherboard temperature monitoring driver

 - Intel PMC improvements for Tiger Lake and Alder Lake

 - misc bugfixes, improvements and quirk additions all over

* tag 'platform-drivers-x86-v5.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86: (87 commits)
  platform/x86: gigabyte-wmi: add support for B550M AORUS PRO-P
  platform/x86: intel_pmc_core: Uninitialized data in pmc_core_lpm_latch_mode_write()
  platform/x86: intel_pmc_core: add ACPI dependency
  platform/surface: aggregator: fix a bit test
  platform/x86: intel_pmc_core: Fix "unsigned 'ret' is never less than zero" smatch warning
  platform/x86: touchscreen_dmi: Add info for the Teclast Tbook 11 tablet
  platform/x86: intel_pmc_core: Add support for Alder Lake PCH-P
  platform/x86: intel_pmc_core: Add LTR registers for Tiger Lake
  platform/x86: intel_pmc_core: Add option to set/clear LPM mode
  platform/x86: intel_pmc_core: Add requirements file to debugfs
  platform/x86: intel_pmc_core: Get LPM requirements for Tiger Lake
  platform/x86: intel_pmc_core: Show LPM residency in microseconds
  platform/x86: intel_pmc_core: Handle sub-states generically
  platform/x86: intel_pmc_core: Remove global struct pmc_dev
  platform/x86: intel_pmc_core: Don't use global pmcdev in quirks
  platform/x86: intel_chtdc_ti_pwrbtn: Fix missing IRQF_ONESHOT as only threaded handler
  platform/x86: gigabyte-wmi: add X570 AORUS ELITE
  platform/x86: thinkpad_acpi: Add labels to the first 2 temperature sensors
  platform/x86: pmc_atom: Match all Beckhoff Automation baytrail boards with critclk_systems DMI table
  platform/x86: add Gigabyte WMI temperature driver
  ...
 2021-04-26 10:58:33 -07:00
Linus Torvalds
31a24ae89c arm64 updates for 5.13: 
- MTE asynchronous support for KASan. Previously only synchronous
   (slower) mode was supported. Asynchronous is faster but does not allow
   precise identification of the illegal access.
 
 - Run kernel mode SIMD with softirqs disabled. This allows using NEON in
   softirq context for crypto performance improvements. The conditional
   yield support is modified to take softirqs into account and reduce the
   latency.
 
 - Preparatory patches for Apple M1: handle CPUs that only have the VHE
   mode available (host kernel running at EL2), add FIQ support.
 
 - arm64 perf updates: support for HiSilicon PA and SLLC PMU drivers, new
   functions for the HiSilicon HHA and L3C PMU, cleanups.
 
 - Re-introduce support for execute-only user permissions but only when
   the EPAN (Enhanced Privileged Access Never) architecture feature is
   available.
 
 - Disable fine-grained traps at boot and improve the documented boot
   requirements.
 
 - Support CONFIG_KASAN_VMALLOC on arm64 (only with KASAN_GENERIC).
 
 - Add hierarchical eXecute Never permissions for all page tables.
 
 - Add arm64 prctl(PR_PAC_{SET,GET}_ENABLED_KEYS) allowing user programs
   to control which PAC keys are enabled in a particular task.
 
 - arm64 kselftests for BTI and some improvements to the MTE tests.
 
 - Minor improvements to the compat vdso and sigpage.
 
 - Miscellaneous cleanups.
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 updates from Catalin Marinas:

 - MTE asynchronous support for KASan. Previously only synchronous
   (slower) mode was supported. Asynchronous is faster but does not
   allow precise identification of the illegal access.

 - Run kernel mode SIMD with softirqs disabled. This allows using NEON
   in softirq context for crypto performance improvements. The
   conditional yield support is modified to take softirqs into account
   and reduce the latency.

 - Preparatory patches for Apple M1: handle CPUs that only have the VHE
   mode available (host kernel running at EL2), add FIQ support.

 - arm64 perf updates: support for HiSilicon PA and SLLC PMU drivers,
   new functions for the HiSilicon HHA and L3C PMU, cleanups.

 - Re-introduce support for execute-only user permissions but only when
   the EPAN (Enhanced Privileged Access Never) architecture feature is
   available.

 - Disable fine-grained traps at boot and improve the documented boot
   requirements.

 - Support CONFIG_KASAN_VMALLOC on arm64 (only with KASAN_GENERIC).

 - Add hierarchical eXecute Never permissions for all page tables.

 - Add arm64 prctl(PR_PAC_{SET,GET}_ENABLED_KEYS) allowing user programs
   to control which PAC keys are enabled in a particular task.

 - arm64 kselftests for BTI and some improvements to the MTE tests.

 - Minor improvements to the compat vdso and sigpage.

 - Miscellaneous cleanups.

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (86 commits)
  arm64/sve: Add compile time checks for SVE hooks in generic functions
  arm64/kernel/probes: Use BUG_ON instead of if condition followed by BUG.
  arm64: pac: Optimize kernel entry/exit key installation code paths
  arm64: Introduce prctl(PR_PAC_{SET,GET}_ENABLED_KEYS)
  arm64: mte: make the per-task SCTLR_EL1 field usable elsewhere
  arm64/sve: Remove redundant system_supports_sve() tests
  arm64: fpsimd: run kernel mode NEON with softirqs disabled
  arm64: assembler: introduce wxN aliases for wN registers
  arm64: assembler: remove conditional NEON yield macros
  kasan, arm64: tests supports for HW_TAGS async mode
  arm64: mte: Report async tag faults before suspend
  arm64: mte: Enable async tag check fault
  arm64: mte: Conditionally compile mte_enable_kernel_*()
  arm64: mte: Enable TCO in functions that can read beyond buffer limits
  kasan: Add report for async mode
  arm64: mte: Drop arch_enable_tagging()
  kasan: Add KASAN mode kernel parameter
  arm64: mte: Add asynchronous mode support
  arm64: Get rid of CONFIG_ARM64_VHE
  arm64: Cope with CPUs stuck in VHE mode
  ...
 2021-04-26 10:25:03 -07:00
Linus Torvalds
64f8e73de0 Support for enhanced split lock detection: 
Newer CPUs provide a second mechanism to detect operations with lock
   prefix which go accross a cache line boundary. Such operations have to
   take bus lock which causes a system wide performance degradation when
   these operations happen frequently.
 
   The new mechanism is not using the #AC exception. It triggers #DB and is
   restricted to operations in user space. Kernel side split lock access can
   only be detected by the #AC based variant. Contrary to the #AC based
   mechanism the #DB based variant triggers _after_ the instruction was
   executed. The mechanism is CPUID enumerated and contrary to the #AC
   version which is based on the magic TEST_CTRL_MSR and model/family based
   enumeration on the way to become architectural.
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Merge tag 'x86-splitlock-2021-04-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 bus lock detection updates from Thomas Gleixner:
 "Support for enhanced split lock detection:

  Newer CPUs provide a second mechanism to detect operations with lock
  prefix which go accross a cache line boundary. Such operations have to
  take bus lock which causes a system wide performance degradation when
  these operations happen frequently.

  The new mechanism is not using the #AC exception. It triggers #DB and
  is restricted to operations in user space. Kernel side split lock
  access can only be detected by the #AC based variant.

  Contrary to the #AC based mechanism the #DB based variant triggers
  _after_ the instruction was executed. The mechanism is CPUID
  enumerated and contrary to the #AC version which is based on the magic
  TEST_CTRL_MSR and model/family based enumeration on the way to become
  architectural"

* tag 'x86-splitlock-2021-04-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  Documentation/admin-guide: Change doc for split_lock_detect parameter
  x86/traps: Handle #DB for bus lock
  x86/cpufeatures: Enumerate #DB for bus lock detection
 2021-04-26 10:09:38 -07:00
Linus Torvalds
eea2647e74 Entry code update: 
Provide support for randomized stack offsets per syscall to make
  stack-based attacks harder which rely on the deterministic stack layout.
 
  The feature is based on the original idea of PaX's RANDSTACK feature, but
  uses a significantly different implementation.
 
  The offset does not affect the pt_regs location on the task stack as this
  was agreed on to be of dubious value. The offset is applied before the
  actual syscall is invoked.
 
  The offset is stored per cpu and the randomization happens at the end of
  the syscall which is less predictable than on syscall entry.
 
  The mechanism to apply the offset is via alloca(), i.e. abusing the
  dispised VLAs. This comes with the drawback that stack-clash-protection
  has to be disabled for the affected compilation units and there is also
  a negative interaction with stack-protector.
 
  Those downsides are traded with the advantage that this approach does not
  require any intrusive changes to the low level assembly entry code, does
  not affect the unwinder and the correct stack alignment is handled
  automatically by the compiler.
 
  The feature is guarded with a static branch which avoids the overhead when
  disabled.
 
  Currently this is supported for X86 and ARM64.
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Merge tag 'x86-entry-2021-04-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull entry code update from Thomas Gleixner:
 "Provide support for randomized stack offsets per syscall to make
  stack-based attacks harder which rely on the deterministic stack
  layout.

  The feature is based on the original idea of PaX's RANDSTACK feature,
  but uses a significantly different implementation.

  The offset does not affect the pt_regs location on the task stack as
  this was agreed on to be of dubious value. The offset is applied
  before the actual syscall is invoked.

  The offset is stored per cpu and the randomization happens at the end
  of the syscall which is less predictable than on syscall entry.

  The mechanism to apply the offset is via alloca(), i.e. abusing the
  dispised VLAs. This comes with the drawback that
  stack-clash-protection has to be disabled for the affected compilation
  units and there is also a negative interaction with stack-protector.

  Those downsides are traded with the advantage that this approach does
  not require any intrusive changes to the low level assembly entry
  code, does not affect the unwinder and the correct stack alignment is
  handled automatically by the compiler.

  The feature is guarded with a static branch which avoids the overhead
  when disabled.

  Currently this is supported for X86 and ARM64"

* tag 'x86-entry-2021-04-26' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  arm64: entry: Enable random_kstack_offset support
  lkdtm: Add REPORT_STACK for checking stack offsets
  x86/entry: Enable random_kstack_offset support
  stack: Optionally randomize kernel stack offset each syscall
  init_on_alloc: Optimize static branches
  jump_label: Provide CONFIG-driven build state defaults
 2021-04-26 10:02:09 -07:00
Aurelien Aptel
443dd65d48 Documentation/admin-guide/cifs: document open_files and dfscache 
Add missing documentation for open_files and dfscache /proc files.

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
 2021-04-25 16:28:22 -05:00
Peter Zijlstra
9406415f46 sched/debug: Rename the sched_debug parameter to sched_verbose 
CONFIG_SCHED_DEBUG is the build-time Kconfig knob, the boot param
sched_debug and the /debug/sched/debug_enabled knobs control the
sched_debug_enabled variable, but what they really do is make
SCHED_DEBUG more verbose, so rename the lot.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
 2021-04-17 13:22:44 +02:00
Catalin Marinas
a1e1eddef2 Merge branches 'for-next/misc', 'for-next/kselftest', 'for-next/xntable', 'for-next/vdso', 'for-next/fiq', 'for-next/epan', 'for-next/kasan-vmalloc', 'for-next/fgt-boot-init', 'for-next/vhe-only' and 'for-next/neon-softirqs-disabled', remote-tracking branch 'arm64/for-next/perf' into for-next/core 
* for-next/misc:
  : Miscellaneous patches
  arm64/sve: Add compile time checks for SVE hooks in generic functions
  arm64/kernel/probes: Use BUG_ON instead of if condition followed by BUG.
  arm64/sve: Remove redundant system_supports_sve() tests
  arm64: mte: Remove unused mte_assign_mem_tag_range()
  arm64: Add __init section marker to some functions
  arm64/sve: Rework SVE access trap to convert state in registers
  docs: arm64: Fix a grammar error
  arm64: smp: Add missing prototype for some smp.c functions
  arm64: setup: name `tcr` register
  arm64: setup: name `mair` register
  arm64: stacktrace: Move start_backtrace() out of the header
  arm64: barrier: Remove spec_bar() macro
  arm64: entry: remove test_irqs_unmasked macro
  ARM64: enable GENERIC_FIND_FIRST_BIT
  arm64: defconfig: Use DEBUG_INFO_REDUCED

* for-next/kselftest:
  : Various kselftests for arm64
  kselftest: arm64: Add BTI tests
  kselftest/arm64: mte: Report filename on failing temp file creation
  kselftest/arm64: mte: Fix clang warning
  kselftest/arm64: mte: Makefile: Fix clang compilation
  kselftest/arm64: mte: Output warning about failing compiler
  kselftest/arm64: mte: Use cross-compiler if specified
  kselftest/arm64: mte: Fix MTE feature detection
  kselftest/arm64: mte: common: Fix write() warnings
  kselftest/arm64: mte: user_mem: Fix write() warning
  kselftest/arm64: mte: ksm_options: Fix fscanf warning
  kselftest/arm64: mte: Fix pthread linking
  kselftest/arm64: mte: Fix compilation with native compiler

* for-next/xntable:
  : Add hierarchical XN permissions for all page tables
  arm64: mm: use XN table mapping attributes for user/kernel mappings
  arm64: mm: use XN table mapping attributes for the linear region
  arm64: mm: add missing P4D definitions and use them consistently

* for-next/vdso:
  : Minor improvements to the compat vdso and sigpage
  arm64: compat: Poison the compat sigpage
  arm64: vdso: Avoid ISB after reading from cntvct_el0
  arm64: compat: Allow signal page to be remapped
  arm64: vdso: Remove redundant calls to flush_dcache_page()
  arm64: vdso: Use GFP_KERNEL for allocating compat vdso and signal pages

* for-next/fiq:
  : Support arm64 FIQ controller registration
  arm64: irq: allow FIQs to be handled
  arm64: Always keep DAIF.[IF] in sync
  arm64: entry: factor irq triage logic into macros
  arm64: irq: rework root IRQ handler registration
  arm64: don't use GENERIC_IRQ_MULTI_HANDLER
  genirq: Allow architectures to override set_handle_irq() fallback

* for-next/epan:
  : Support for Enhanced PAN (execute-only permissions)
  arm64: Support execute-only permissions with Enhanced PAN

* for-next/kasan-vmalloc:
  : Support CONFIG_KASAN_VMALLOC on arm64
  arm64: Kconfig: select KASAN_VMALLOC if KANSAN_GENERIC is enabled
  arm64: kaslr: support randomized module area with KASAN_VMALLOC
  arm64: Kconfig: support CONFIG_KASAN_VMALLOC
  arm64: kasan: abstract _text and _end to KERNEL_START/END
  arm64: kasan: don't populate vmalloc area for CONFIG_KASAN_VMALLOC

* for-next/fgt-boot-init:
  : Booting clarifications and fine grained traps setup
  arm64: Require that system registers at all visible ELs be initialized
  arm64: Disable fine grained traps on boot
  arm64: Document requirements for fine grained traps at boot

* for-next/vhe-only:
  : Dealing with VHE-only CPUs (a.k.a. M1)
  arm64: Get rid of CONFIG_ARM64_VHE
  arm64: Cope with CPUs stuck in VHE mode
  arm64: cpufeature: Allow early filtering of feature override

* arm64/for-next/perf:
  arm64: perf: Remove redundant initialization in perf_event.c
  perf/arm_pmu_platform: Clean up with dev_printk
  perf/arm_pmu_platform: Fix error handling
  perf/arm_pmu_platform: Use dev_err_probe() for IRQ errors
  docs: perf: Address some html build warnings
  docs: perf: Add new description on HiSilicon uncore PMU v2
  drivers/perf: hisi: Add support for HiSilicon PA PMU driver
  drivers/perf: hisi: Add support for HiSilicon SLLC PMU driver
  drivers/perf: hisi: Update DDRC PMU for programmable counter
  drivers/perf: hisi: Add new functions for HHA PMU
  drivers/perf: hisi: Add new functions for L3C PMU
  drivers/perf: hisi: Add PMU version for uncore PMU drivers.
  drivers/perf: hisi: Refactor code for more uncore PMUs
  drivers/perf: hisi: Remove unnecessary check of counter index
  drivers/perf: Simplify the SMMUv3 PMU event attributes
  drivers/perf: convert sysfs sprintf family to sysfs_emit
  drivers/perf: convert sysfs scnprintf family to sysfs_emit_at() and sysfs_emit()
  drivers/perf: convert sysfs snprintf family to sysfs_emit

* for-next/neon-softirqs-disabled:
  : Run kernel mode SIMD with softirqs disabled
  arm64: fpsimd: run kernel mode NEON with softirqs disabled
  arm64: assembler: introduce wxN aliases for wN registers
  arm64: assembler: remove conditional NEON yield macros
 2021-04-15 14:00:38 +01:00
Sumit Garg
5d0682be31 KEYS: trusted: Add generic trusted keys framework 
Current trusted keys framework is tightly coupled to use TPM device as
an underlying implementation which makes it difficult for implementations
like Trusted Execution Environment (TEE) etc. to provide trusted keys
support in case platform doesn't posses a TPM device.

Add a generic trusted keys framework where underlying implementations
can be easily plugged in. Create struct trusted_key_ops to achieve this,
which contains necessary functions of a backend.

Also, define a module parameter in order to select a particular trust
source in case a platform support multiple trust sources. In case its
not specified then implementation itetrates through trust sources list
starting with TPM and assign the first trust source as a backend which
has initiazed successfully during iteration.

Note that current implementation only supports a single trust source at
runtime which is either selectable at compile time or during boot via
aforementioned module parameter.

Suggested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
 2021-04-14 16:30:30 +03:00
Thorsten Leemhuis
6161a4b18a docs: reporting-issues: make people CC the regressions list 
Make people CC the recently created mailing list dedicated to Linux
kernel regressions when reporting one. Some paragraphs had to be
reshuffled and slightly rewritten during the process, as the text
otherwise would have gotten unnecessarily hard to follow.

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/ac28089d710d5d41f295221bc726555ba32f4984.1617967127.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-04-13 15:13:27 -06:00
Marc Zyngier
2d726d0db6 arm64: Get rid of CONFIG_ARM64_VHE 
CONFIG_ARM64_VHE was introduced with ARMv8.1 (some 7 years ago),
and has been enabled by default for almost all that time.

Given that newer systems that are VHE capable are finally becoming
available, and that some systems are even incapable of not running VHE,
drop the configuration altogether.

Anyone willing to stick to non-VHE on VHE hardware for obscure
reasons should use the 'kvm-arm.mode=nvhe' command-line option.

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210408131010.1109027-4-maz@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
 2021-04-08 18:45:16 +01:00
Kees Cook
39218ff4c6 stack: Optionally randomize kernel stack offset each syscall 
This provides the ability for architectures to enable kernel stack base
address offset randomization. This feature is controlled by the boot
param "randomize_kstack_offset=on/off", with its default value set by
CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT.

This feature is based on the original idea from the last public release
of PaX's RANDKSTACK feature: https://pax.grsecurity.net/docs/randkstack.txt
All the credit for the original idea goes to the PaX team. Note that
the design and implementation of this upstream randomize_kstack_offset
feature differs greatly from the RANDKSTACK feature (see below).

Reasoning for the feature:

This feature aims to make harder the various stack-based attacks that
rely on deterministic stack structure. We have had many such attacks in
past (just to name few):

https://jon.oberheide.org/files/infiltrate12-thestackisback.pdf
https://jon.oberheide.org/files/stackjacking-infiltrate11.pdf
https://googleprojectzero.blogspot.com/2016/06/exploiting-recursion-in-linux-kernel_20.html

As Linux kernel stack protections have been constantly improving
(vmap-based stack allocation with guard pages, removal of thread_info,
STACKLEAK), attackers have had to find new ways for their exploits
to work. They have done so, continuing to rely on the kernel's stack
determinism, in situations where VMAP_STACK and THREAD_INFO_IN_TASK_STRUCT
were not relevant. For example, the following recent attacks would have
been hampered if the stack offset was non-deterministic between syscalls:

https://repositorio-aberto.up.pt/bitstream/10216/125357/2/374717.pdf
(page 70: targeting the pt_regs copy with linear stack overflow)

https://a13xp0p0v.github.io/2020/02/15/CVE-2019-18683.html
(leaked stack address from one syscall as a target during next syscall)

The main idea is that since the stack offset is randomized on each system
call, it is harder for an attack to reliably land in any particular place
on the thread stack, even with address exposures, as the stack base will
change on the next syscall. Also, since randomization is performed after
placing pt_regs, the ptrace-based approach[1] to discover the randomized
offset during a long-running syscall should not be possible.

Design description:

During most of the kernel's execution, it runs on the "thread stack",
which is pretty deterministic in its structure: it is fixed in size,
and on every entry from userspace to kernel on a syscall the thread
stack starts construction from an address fetched from the per-cpu
cpu_current_top_of_stack variable. The first element to be pushed to the
thread stack is the pt_regs struct that stores all required CPU registers
and syscall parameters. Finally the specific syscall function is called,
with the stack being used as the kernel executes the resulting request.

The goal of randomize_kstack_offset feature is to add a random offset
after the pt_regs has been pushed to the stack and before the rest of the
thread stack is used during the syscall processing, and to change it every
time a process issues a syscall. The source of randomness is currently
architecture-defined (but x86 is using the low byte of rdtsc()). Future
improvements for different entropy sources is possible, but out of scope
for this patch. Further more, to add more unpredictability, new offsets
are chosen at the end of syscalls (the timing of which should be less
easy to measure from userspace than at syscall entry time), and stored
in a per-CPU variable, so that the life of the value does not stay
explicitly tied to a single task.

As suggested by Andy Lutomirski, the offset is added using alloca()
and an empty asm() statement with an output constraint, since it avoids
changes to assembly syscall entry code, to the unwinder, and provides
correct stack alignment as defined by the compiler.

In order to make this available by default with zero performance impact
for those that don't want it, it is boot-time selectable with static
branches. This way, if the overhead is not wanted, it can just be
left turned off with no performance impact.

The generated assembly for x86_64 with GCC looks like this:

...
ffffffff81003977: 65 8b 05 02 ea 00 7f  mov %gs:0x7f00ea02(%rip),%eax
					    # 12380 <kstack_offset>
ffffffff8100397e: 25 ff 03 00 00        and $0x3ff,%eax
ffffffff81003983: 48 83 c0 0f           add $0xf,%rax
ffffffff81003987: 25 f8 07 00 00        and $0x7f8,%eax
ffffffff8100398c: 48 29 c4              sub %rax,%rsp
ffffffff8100398f: 48 8d 44 24 0f        lea 0xf(%rsp),%rax
ffffffff81003994: 48 83 e0 f0           and $0xfffffffffffffff0,%rax
...

As a result of the above stack alignment, this patch introduces about
5 bits of randomness after pt_regs is spilled to the thread stack on
x86_64, and 6 bits on x86_32 (since its has 1 fewer bit required for
stack alignment). The amount of entropy could be adjusted based on how
much of the stack space we wish to trade for security.

My measure of syscall performance overhead (on x86_64):

lmbench: /usr/lib/lmbench/bin/x86_64-linux-gnu/lat_syscall -N 10000 null
    randomize_kstack_offset=y	Simple syscall: 0.7082 microseconds
    randomize_kstack_offset=n	Simple syscall: 0.7016 microseconds

So, roughly 0.9% overhead growth for a no-op syscall, which is very
manageable. And for people that don't want this, it's off by default.

There are two gotchas with using the alloca() trick. First,
compilers that have Stack Clash protection (-fstack-clash-protection)
enabled by default (e.g. Ubuntu[3]) add pagesize stack probes to
any dynamic stack allocations. While the randomization offset is
always less than a page, the resulting assembly would still contain
(unreachable!) probing routines, bloating the resulting assembly. To
avoid this, -fno-stack-clash-protection is unconditionally added to
the kernel Makefile since this is the only dynamic stack allocation in
the kernel (now that VLAs have been removed) and it is provably safe
from Stack Clash style attacks.

The second gotcha with alloca() is a negative interaction with
-fstack-protector*, in that it sees the alloca() as an array allocation,
which triggers the unconditional addition of the stack canary function
pre/post-amble which slows down syscalls regardless of the static
branch. In order to avoid adding this unneeded check and its associated
performance impact, architectures need to carefully remove uses of
-fstack-protector-strong (or -fstack-protector) in the compilation units
that use the add_random_kstack() macro and to audit the resulting stack
mitigation coverage (to make sure no desired coverage disappears). No
change is visible for this on x86 because the stack protector is already
unconditionally disabled for the compilation unit, but the change is
required on arm64. There is, unfortunately, no attribute that can be
used to disable stack protector for specific functions.

Comparison to PaX RANDKSTACK feature:

The RANDKSTACK feature randomizes the location of the stack start
(cpu_current_top_of_stack), i.e. including the location of pt_regs
structure itself on the stack. Initially this patch followed the same
approach, but during the recent discussions[2], it has been determined
to be of a little value since, if ptrace functionality is available for
an attacker, they can use PTRACE_PEEKUSR/PTRACE_POKEUSR to read/write
different offsets in the pt_regs struct, observe the cache behavior of
the pt_regs accesses, and figure out the random stack offset. Another
difference is that the random offset is stored in a per-cpu variable,
rather than having it be per-thread. As a result, these implementations
differ a fair bit in their implementation details and results, though
obviously the intent is similar.

[1] https://lore.kernel.org/kernel-hardening/2236FBA76BA1254E88B949DDB74E612BA4BC57C1@IRSMSX102.ger.corp.intel.com/
[2] https://lore.kernel.org/kernel-hardening/20190329081358.30497-1-elena.reshetova@intel.com/
[3] https://lists.ubuntu.com/archives/ubuntu-devel/2019-June/040741.html

Co-developed-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210401232347.2791257-4-keescook@chromium.org
 2021-04-08 14:05:19 +02:00
Maciej W. Rozycki
7d33004d24 pata_legacy: Add `probe_mask' parameter like with ide-generic 
Carry the `probe_mask' parameter over from ide-generic to pata_legacy so
that there is a way to prevent random poking at ISA port I/O locations
in attempt to discover adapter option cards with libata like with the
old IDE driver.  By default all enabled locations are tried, however it
may interfere with a different kind of hardware responding there.

For example with a plain (E)ISA system the driver tries all the six
possible locations:

scsi host0: pata_legacy
ata1: PATA max PIO4 cmd 0x1f0 ctl 0x3f6 irq 14
ata1.00: ATA-4: ST310211A, 3.54, max UDMA/100
ata1.00: 19541088 sectors, multi 16: LBA
ata1.00: configured for PIO
scsi 0:0:0:0: Direct-Access     ATA      ST310211A        3.54 PQ: 0 ANSI: 5
scsi 0:0:0:0: Attached scsi generic sg0 type 0
sd 0:0:0:0: [sda] 19541088 512-byte logical blocks: (10.0 GB/9.32 GiB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
 sda: sda1 sda2 sda3
sd 0:0:0:0: [sda] Attached SCSI disk
scsi host1: pata_legacy
ata2: PATA max PIO4 cmd 0x170 ctl 0x376 irq 15
scsi host1: pata_legacy
ata3: PATA max PIO4 cmd 0x1e8 ctl 0x3ee irq 11
scsi host1: pata_legacy
ata4: PATA max PIO4 cmd 0x168 ctl 0x36e irq 10
scsi host1: pata_legacy
ata5: PATA max PIO4 cmd 0x1e0 ctl 0x3e6 irq 8
scsi host1: pata_legacy
ata6: PATA max PIO4 cmd 0x160 ctl 0x366 irq 12

however giving the kernel "pata_legacy.probe_mask=21" makes it try every
other location only:

scsi host0: pata_legacy
ata1: PATA max PIO4 cmd 0x1f0 ctl 0x3f6 irq 14
ata1.00: ATA-4: ST310211A, 3.54, max UDMA/100
ata1.00: 19541088 sectors, multi 16: LBA
ata1.00: configured for PIO
scsi 0:0:0:0: Direct-Access     ATA      ST310211A        3.54 PQ: 0 ANSI: 5
scsi 0:0:0:0: Attached scsi generic sg0 type 0
sd 0:0:0:0: [sda] 19541088 512-byte logical blocks: (10.0 GB/9.32 GiB)
sd 0:0:0:0: [sda] Write Protect is off
sd 0:0:0:0: [sda] Mode Sense: 00 3a 00 00
sd 0:0:0:0: [sda] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
 sda: sda1 sda2 sda3
sd 0:0:0:0: [sda] Attached SCSI disk
scsi host1: pata_legacy
ata2: PATA max PIO4 cmd 0x1e8 ctl 0x3ee irq 11
scsi host1: pata_legacy
ata3: PATA max PIO4 cmd 0x1e0 ctl 0x3e6 irq 8

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2103211800110.21463@angie.orcam.me.uk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2021-04-06 09:27:30 -06:00
Maciej W. Rozycki
6ddcec9547 pata_platform: Document `pio_mask' module parameter 
Add MODULE_PARM_DESC documentation and a kernel-parameters.txt entry.

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2103212023190.21463@angie.orcam.me.uk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2021-04-06 09:27:30 -06:00
Maciej W. Rozycki
426e2c6a2c pata_legacy: Properly document module parameters 
Most pata_legacy module parameters lack MODULE_PARM_DESC documentation
and none is described in kernel-parameters.txt.  Also several comments
are inaccurate or wrong.

Add the missing documentation pieces then and reorder parameters into a
consistent block.  Remove inaccuracies as follows:

- `all' affects primary and secondary port ranges only rather than all,

- `probe_all' affects tertiary and further port ranges rather than all,

- `ht6560b' is for HT 6560B rather than HT 6560A.

Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/alpine.DEB.2.21.2103211909560.21463@angie.orcam.me.uk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
 2021-04-06 09:27:30 -06:00
Vipin Sharma
25259fc914 cgroup: Miscellaneous cgroup documentation. 
Documentation of miscellaneous cgroup controller. This new controller is
used to track and limit the usage of scalar resources.

Signed-off-by: Vipin Sharma <vipinsh@google.com>
Reviewed-by: David Rientjes <rientjes@google.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
 2021-04-04 13:34:46 -04:00
Christophe Leroy
51c66ad849 powerpc/bpf: Implement extended BPF on PPC32 
Implement Extended Berkeley Packet Filter on Powerpc 32

Test result with test_bpf module:

	test_bpf: Summary: 378 PASSED, 0 FAILED, [354/366 JIT'ed]

Registers mapping:

	[BPF_REG_0] = r11-r12
	/* function arguments */
	[BPF_REG_1] = r3-r4
	[BPF_REG_2] = r5-r6
	[BPF_REG_3] = r7-r8
	[BPF_REG_4] = r9-r10
	[BPF_REG_5] = r21-r22 (Args 9 and 10 come in via the stack)
	/* non volatile registers */
	[BPF_REG_6] = r23-r24
	[BPF_REG_7] = r25-r26
	[BPF_REG_8] = r27-r28
	[BPF_REG_9] = r29-r30
	/* frame pointer aka BPF_REG_10 */
	[BPF_REG_FP] = r17-r18
	/* eBPF jit internal registers */
	[BPF_REG_AX] = r19-r20
	[TMP_REG] = r31

As PPC32 doesn't have a redzone in the stack, a stack frame must always
be set in order to host at least the tail count counter.

The stack frame remains for tail calls, it is set by the first callee
and freed by the last callee.

r0 is used as temporary register as much as possible. It is referenced
directly in the code in order to avoid misusing it, because some
instructions interpret it as value 0 instead of register r0
(ex: addi, addis, stw, lwz, ...)

The following operations are not implemented:

		case BPF_ALU64 | BPF_DIV | BPF_X: /* dst /= src */
		case BPF_ALU64 | BPF_MOD | BPF_X: /* dst %= src */
		case BPF_STX | BPF_XADD | BPF_DW: /* *(u64 *)(dst + off) += src */

The following operations are only implemented for power of two constants:

		case BPF_ALU64 | BPF_MOD | BPF_K: /* dst %= imm */
		case BPF_ALU64 | BPF_DIV | BPF_K: /* dst /= imm */

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/61d8b149176ddf99e7d5cef0b6dc1598583ca202.1616430991.git.christophe.leroy@csgroup.eu
 2021-04-03 21:22:21 +11:00
Ismael Luceno
0e5e0a5553 docs: reporting-issues: Remove reference to oldnoconfig 
Replace it with olddefconfig. oldnoconfig didn't do what the document
suggests (it aliased to olddefconfig), and isn't available since 4.19.

Ref: 04c459d204 ("kconfig: remove oldnoconfig target")
Ref: 312ee68752 ("kconfig: announce removal of oldnoconfig if used")
Signed-off-by: Ismael Luceno <ismael@iodev.co.uk>
Link: https://lore.kernel.org/r/20210331163541.28356-1-ismael@iodev.co.uk
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-31 14:33:45 -06:00
Wang Qing
c5c1c700e2 doc: admin-guide: remove explanation of "watchdog/%u" 
"watchdog/%u" threads has be replaced by cpu_stop_work,
which will mislead the reader.

Signed-off-by: Wang Qing <wangqing@vivo.com>
Link: https://lore.kernel.org/r/1615801744-31548-1-git-send-email-wangqing@vivo.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-31 14:32:02 -06:00
Mark O'Donovan
abb9c07885 Documentation: Add leading slash to some paths 
Change multiple sys/xyz to /sys/xyz

Signed-off-by: Mark O'Donovan <shiftee@posteo.net>
Link: https://lore.kernel.org/r/20210328152837.73347-1-shiftee@posteo.net
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-31 13:49:19 -06:00
Thorsten Leemhuis
58c539453b docs: reporting-issues: reduce quoting and assorted fixes 
A pile of small fixes:

- don't quote terms like vanilla, mainline, and stable, unless in they
  occur in places where readers new to the kernel might see them for the
  first time

- make people rule out that vendor patches are interfering if they face
  a regression in a stable or longterm kernel they saw in a vendor
  kernel for the first time

- s/bugs/issues/ in a selected spots

- exchange two headlines that got mixed up somehow

- add a few links to some of the steps in the guide

- Greg mentioned sending reports to the stable mailing list is
  sufficient, so remove the "CC stable maintainers" bits

- fix a few typos and mistakes in the text, with a few very small
  improvements along the way

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Link: https://lore.kernel.org/r/07bca15d8465b8e234537feb8841dd2ff20243bc.1617113469.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-31 13:47:07 -06:00
Thorsten Leemhuis
4d2f46a8cd docs: reporting-issues.rst: reshuffle and improve TLDR 
Make the TLDR a bit shorter while improving it at the same time by going
straight to the aspects readers are more interested it. The change makes
the process especially more straight-forward for people that hit a
regression in a stable or longterm kernel. Due to the changes the TLDR
now also matches the step by step guide better.

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Link: https://lore.kernel.org/r/762ccd7735315d2fdaa79612fccc1f474881118b.1617113469.git.linux@leemhuis.info
[ jc: fixed transposed _` as noted by Thorsten ]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-31 13:46:33 -06:00
Thorsten Leemhuis
d2ce285378 docs: make reporting-issues.rst official and delete reporting-bugs.rst 
Remove the WIP and two FIXME notes in the text to make it official, as
it's now considered fully ready for consumption. To make sure this
step is okay for people the intent of this change and the latest version
of the text were posted to ksummit-discuss; nobody complained, thus
lets move ahead.

Add a footer to point out people can contact Thorsten directly in case
they find something to improve in the text.

Dear reporting-bugs.rst, I'm sorry to tell you, but that makes you fully
obsolete and we thus have to let you go now. Thank you very much for
your service, you in one form or another have been around for a long
time. I'm sure over the years you got read a lot and helped quite a few
people. But it's time to retire now. Rest in peace.

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
CC: Harry Wei <harryxiyou@gmail.com>
CC: Alex Shi <alex.shi@linux.alibaba.com>
CC: Federico Vaga <federico.vaga@vaga.pv.it>
CC: Greg KH <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/49c674c2d304d87e6259063580fda05267e8c348.1617113469.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-31 13:33:17 -06:00
Mukesh Ojha
9d843e8faf pstore: Add mem_type property DT parsing support 
There could be a scenario where we define some region
in normal memory and use them store to logs which is later
retrieved by bootloader during warm reset.

In this scenario, we wanted to treat this memory as normal
cacheable memory instead of default behaviour which
is an overhead. Making it cacheable could improve
performance.

This commit gives control to change mem_type from Device
tree, and also documents the value for normal memory.

Signed-off-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/1616438537-13719-1-git-send-email-mojha@codeaurora.org
 2021-03-31 10:06:23 -07:00
Qi Liu
b88f5e9792 docs: perf: Address some html build warnings 
Fix following html build warnings:
Documentation/admin-guide/perf/hisi-pmu.rst:61: WARNING: Unexpected indentation.
Documentation/admin-guide/perf/hisi-pmu.rst:62: WARNING: Block quote ends without a blank line; unexpected unindent.
Documentation/admin-guide/perf/hisi-pmu.rst:69: WARNING: Unexpected indentation.
Documentation/admin-guide/perf/hisi-pmu.rst:70: WARNING: Block quote ends without a blank line; unexpected unindent.
Documentation/admin-guide/perf/hisi-pmu.rst:83: WARNING: Unexpected indentation.

Fixes: 9b86b1b41e ("docs: perf: Add new description on HiSilicon uncore PMU v2")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Qi Liu <liuqi115@huawei.com>
Link: https://lore.kernel.org/r/1617021121-31450-1-git-send-email-liuqi115@huawei.com
Signed-off-by: Will Deacon <will@kernel.org>
 2021-03-30 11:39:09 +01:00
Fenghua Yu
ebca17707e Documentation/admin-guide: Change doc for split_lock_detect parameter 
Since #DB for bus lock detect changes the split_lock_detect parameter,
update the documentation for the changes.

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210322135325.682257-4-fenghua.yu@intel.com
 2021-03-28 22:52:16 +02:00
Andy Shevchenko
81dd500b1c gpio: mockup: Adjust documentation to the code 
First of all one of the parameter missed 'mockup' in its name,
Second, the semantics of the integer pairs depends on the sign
of the base (the first value in the pair).

Update documentation to reflect the real code behaviour.

Fixes: 2fd1abe99e ("Documentation: gpio: add documentation for gpio-mockup")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
 2021-03-26 14:56:19 +01:00
Dmitry Vyukov
6c996e1994 net: change netdev_unregister_timeout_secs min value to 1 
netdev_unregister_timeout_secs=0 can lead to printing the
"waiting for dev to become free" message every jiffy.
This is too frequent and unnecessary.
Set the min value to 1 second.

Also fix the merge issue introduced by
"net: make unregister netdev warning timeout configurable":
it changed "refcnt != 1" to "refcnt".

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Fixes: 5aa3afe107 ("net: make unregister netdev warning timeout configurable")
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 2021-03-25 17:24:06 -07:00
Darrick J. Wong
3fef46fc43 xfs: rename the blockgc workqueue 
Since we're about to start using the blockgc workqueue to dispose of
inactivated inodes, strip the "block" prefix from the name; now it's
merely the general garbage collection (gc) workqueue.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
 2021-03-25 16:47:50 -07:00
Thorsten Leemhuis
4b9d49d1ec docs: reporting-issues.rst: improved process esp. for stable regressions 
Provide a shorter and easier process for users that deal with
regressions in stable and longterm kernels, as those should be reported
quickly.

To realize this in the least-confusing way and without having steps
multiple times in different places, split the 'search for existing
reports' into two. That has the additinal benefit that users will search
for them quickly when going through the step by step guide and thus will
save them trouble if the find reports.

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
CC: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/d934c15e536bceeff5c40a126930ddf803548e08.1616181657.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-25 12:16:46 -06:00
Thorsten Leemhuis
9bc4430db5 docs: reporting-issues.rst: duplicate sections for reviewing purposes 
This duplicates two section to make the diff in the next patch a bit
easier to gasp for humans.

Straight copy, no content changes.

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Link: https://lore.kernel.org/r/ef85edc8466f035eb243dd6629429ad4fd0565d8.1616181657.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-25 12:16:46 -06:00
Thorsten Leemhuis
4f08d7ab90 docs: reporting-issues.rst: reorder some steps 
Reorder some steps where the order in which the readers perform them is
not crucial. This is a preparation for a later change that would make
the text much more complex otherwise.

Content just moved, not changed at all in the process.

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Link: https://lore.kernel.org/r/8dfc58efde25a05ccf9bf85929826c4b1b9e09c5.1616181657.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-25 12:16:46 -06:00
Thorsten Leemhuis
2dfa9eb0ff docs: reporting-issues.rst: tone down 'test vanilla mainline' a little 
Tell users that reporting bugs with vendor kernels which are only
slightly patched can be okay in some situations, but point out there's a
risk in doing so.

Adjust some related sections to make them compatible and a bit clearer.
At the same time make them less daunting: we want users to report bugs,
even if they can't test vanilla mainline kernel.

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
CC: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/652ee20eb36228f5d7ca842299faa4cb472feedb.1616181657.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-25 12:16:46 -06:00
Thorsten Leemhuis
613f969117 docs: reporting-issues.rst: fix small typos and style issues 
Fix a typo and change "head over" to "scroll down", as suggested by Jon
when reviewing another patch that used the phrase the same way.

Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info>
Link: https://lore.kernel.org/r/fb845d2f1db6138337203bbfac419c04b5f28053.1616181657.git.linux@leemhuis.info
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-25 12:16:46 -06:00
Shaokun Zhang
9b86b1b41e docs: perf: Add new description on HiSilicon uncore PMU v2 
Some news functions are added on HiSilicon uncore PMUs. Document them
to provide guidance on how to use them.

Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Co-developed-by: Qi Liu <liuqi115@huawei.com>
Signed-off-by: Qi Liu <liuqi115@huawei.com>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Link: https://lore.kernel.org/r/1615186237-22263-10-git-send-email-zhangshaokun@hisilicon.com
Signed-off-by: Will Deacon <will@kernel.org>
 2021-03-25 13:03:46 +00:00
Paul E. McKenney
ab6ad3dbdd Merge branches 'bitmaprange.2021.03.08a', 'fixes.2021.03.15a', 'kvfree_rcu.2021.03.08a', 'mmdumpobj.2021.03.08a', 'nocb.2021.03.15a', 'poll.2021.03.24a', 'rt.2021.03.08a', 'tasks.2021.03.08a', 'torture.2021.03.08a' and 'torturescript.2021.03.22a' into HEAD 
bitmaprange.2021.03.08a:  Allow 3-N for bitmap ranges.
fixes.2021.03.15a:  Miscellaneous fixes.
kvfree_rcu.2021.03.08a:  kvfree_rcu() updates.
mmdumpobj.2021.03.08a:  mem_dump_obj() updates.
nocb.2021.03.15a:  RCU NOCB CPU updates, including limited deoffloading.
poll.2021.03.24a:  Polling grace-period interfaces for RCU.
rt.2021.03.08a:  Realtime-related RCU changes.
tasks.2021.03.08a:  Tasks-RCU updates.
torture.2021.03.08a:  Torture-test updates.
torturescript.2021.03.22a:  Torture-test scripting updates.
 2021-03-24 17:20:18 -07:00
Dmitry Vyukov
5aa3afe107 net: make unregister netdev warning timeout configurable 
netdev_wait_allrefs() issues a warning if refcount does not drop to 0
after 10 seconds. While 10 second wait generally should not happen
under normal workload in normal environment, it seems to fire falsely
very often during fuzzing and/or in qemu emulation (~10x slower).
At least it's not possible to understand if it's really a false
positive or not. Automated testing generally bumps all timeouts
to very high values to avoid flake failures.
Add net.core.netdev_unregister_timeout_secs sysctl to make
the timeout configurable for automated testing systems.
Lowering the timeout may also be useful for e.g. manual bisection.
The default value matches the current behavior.

Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Fixes: https://bugzilla.kernel.org/show_bug.cgi?id=211877
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>
 2021-03-23 17:22:50 -07:00
Nitin Joshi
3feb52a2b8 platform/x86: thinkpad_acpi: sysfs interface to get wwan antenna type 
On some newer Thinkpads we need to set SAR value based on antenna type.
This patch provides a sysfs interface that userspace can use to get
antenna type and set corresponding SAR value, as is required for FCC
certification.

Reviewed-by: Mark Pearson <markpearson@lenovo.com>
Signed-off-by: Nitin Joshi <njoshi1@lenovo.com>
Link: https://lore.kernel.org/r/20210317024636.356175-1-njoshi1@lenovo.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
 2021-03-21 18:04:19 +01:00
Robin Murphy
3542dcb15c iommu/dma: Resurrect the "forcedac" option 
In converting intel-iommu over to the common IOMMU DMA ops, it quietly
lost the functionality of its "forcedac" option. Since this is a handy
thing both for testing and for performance optimisation on certain
platforms, reimplement it under the common IOMMU parameter namespace.

For the sake of fixing the inadvertent breakage of the Intel-specific
parameter, remove the dmar_forcedac remnants and hook it up as an alias
while documenting the transition to the new common parameter.

Fixes: c588072bba ("iommu/vt-d: Convert intel iommu driver to the iommu ops")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/7eece8e0ea7bfbe2cd0e30789e0d46df573af9b0.1614961776.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
 2021-03-18 10:55:23 +01:00
Gao Xiang
a8f2a68e42 Documentation: sysrq: update description about sysrq crash 
After commit 8341f2f222 ("sysrq: Use panic() to force a crash"),
a crash was not generated by dereferencing a NULL pointer anymore.

Let's update documentation as well to make it less misleading.

Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Zefan Li <lizefan.x@bytedance.com>
Link: https://lore.kernel.org/r/20210309191550.3955601-1-hsiangkao@redhat.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-15 14:23:21 -06:00
Jiele zhao
0860b72d53 security/loadpin: Update the changing interface in the source code. 
Loadpin cmdline interface "enabled" has been renamed to "enforce"
for a long time, but the User Description Document was not updated.
(Meaning unchanged)

And kernel_read_file* were moved from linux/fs.h to its own
linux/kernel_read_file.h include file. So update that change here.

Signed-off-by: Jiele zhao <unclexiaole@gmail.com>
Link: https://lore.kernel.org/r/20210308020358.102836-1-unclexiaole@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-15 13:32:32 -06:00
Bhaskar Chowdhury
fdebeae0d7 docs: admin-guide: cgroup-v1: Fix typos in the file memory.rst 
s/overcommited/overcommitted/
s/Overcommiting/Overcommitting/

Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210313061029.28024-1-unixbhaskar@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-15 13:03:25 -06:00
Jiri Slaby
67b1544a55 tty: isicom, remove this orphan 
The Isicom driver was orphaned by commit d86b3001a1 (MAINTAINERS:
orphan isicom) 10 years ago. Noone stepped up to take care of them and
to fix all the issues the driver has.

So it's time to drop the driver with all its traces.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210302062214.29627-6-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2021-03-10 09:34:06 +01:00
Jiri Slaby
f76edd8f7c tty: cyclades, remove this orphan 
The Cyclades driver was orphaned by commit d459883e6c (MAINTAINERS:
remove two dead e-mail) 13 years ago. Noone stepped up to take care of
them and to fix all the issues the driver has.

On the top of that, there is no way to obtain the firmware for Z cards
from the vendor as cyclades.com ceased to exist.

So it's time to drop the driver with all its traces.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210302062214.29627-5-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 2021-03-10 09:34:06 +01:00
Kefeng Wang
f6e5aedf47
riscv: Add support for memtest 
The riscv [rv32_]defconfig enabled CONFIG_MEMTEST,
but memtest feature is not supported in RISCV.

Add early_memtest() to support for memtest.

Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
 2021-03-09 18:09:46 -08:00
Barry Song
00b072c011 Documentation/admin-guide: kernel-parameters: correct the architectures for numa_balancing 
X86 isn't the only architecture supporting NUMA_BALANCING. ARM64, PPC,
S390 and RISCV also support it:

arch$ git grep NUMA_BALANCING
arm64/Kconfig:  select ARCH_SUPPORTS_NUMA_BALANCING
arm64/configs/defconfig:CONFIG_NUMA_BALANCING=y
arm64/include/asm/pgtable.h:#ifdef CONFIG_NUMA_BALANCING
powerpc/configs/powernv_defconfig:CONFIG_NUMA_BALANCING=y
powerpc/configs/ppc64_defconfig:CONFIG_NUMA_BALANCING=y
powerpc/configs/pseries_defconfig:CONFIG_NUMA_BALANCING=y
powerpc/include/asm/book3s/64/pgtable.h:#ifdef CONFIG_NUMA_BALANCING
powerpc/include/asm/book3s/64/pgtable.h:#ifdef CONFIG_NUMA_BALANCING
powerpc/include/asm/book3s/64/pgtable.h:#endif /* CONFIG_NUMA_BALANCING */
powerpc/include/asm/book3s/64/pgtable.h:#ifdef CONFIG_NUMA_BALANCING
powerpc/include/asm/book3s/64/pgtable.h:#endif /* CONFIG_NUMA_BALANCING */
powerpc/include/asm/nohash/pgtable.h:#ifdef CONFIG_NUMA_BALANCING
powerpc/include/asm/nohash/pgtable.h:#endif /* CONFIG_NUMA_BALANCING */
powerpc/platforms/Kconfig.cputype:      select ARCH_SUPPORTS_NUMA_BALANCING
riscv/Kconfig:  select ARCH_SUPPORTS_NUMA_BALANCING
riscv/include/asm/pgtable.h:#ifdef CONFIG_NUMA_BALANCING
s390/Kconfig:   select ARCH_SUPPORTS_NUMA_BALANCING
s390/configs/debug_defconfig:CONFIG_NUMA_BALANCING=y
s390/configs/defconfig:CONFIG_NUMA_BALANCING=y
s390/include/asm/pgtable.h:#ifdef CONFIG_NUMA_BALANCING
x86/Kconfig:    select ARCH_SUPPORTS_NUMA_BALANCING     if X86_64
x86/include/asm/pgtable.h:#ifdef CONFIG_NUMA_BALANCING
x86/include/asm/pgtable.h:#endif /* CONFIG_NUMA_BALANCING */

On the other hand, setup_numabalancing() is implemented in mm/mempolicy.c
which doesn't depend on architectures.

Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210302084159.33688-1-song.bao.hua@hisilicon.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
 2021-03-08 17:19:05 -07:00