With the introduction of 26751de25d ("spi: bcm2835: Micro-optimise
FIFO loops") it has become apparent that some users might initiate
zero-length SPI transfers. A fact the micro-optimization omitted, and
which turned out to cause crashes[1].
Instead of changing the micro-optimization itself, use a bigger hammer
and skip zero-length transfers altogether for drivers using the default
transfer_one_message() implementation.
Reported-by: Phil Elwell <phil@raspberrypi.com>
Fixes: 26751de25d ("spi: bcm2835: Micro-optimise FIFO loops")
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
[1] https://github.com/raspberrypi/linux/issues/4100
Link: https://lore.kernel.org/r/20210211180820.25757-1-nsaenzjulienne@suse.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Since "data" is u32, &data is a "u32 *" type, which means pointer math
will move in u32-sized steps. This was meant to be a byte offset, so
cast &data to "char *" to aim the copy into the correct location.
Seen with -Warray-bounds (and found by Coverity):
In file included from ./include/linux/string.h:269,
from ./arch/powerpc/include/asm/paca.h:15,
from ./arch/powerpc/include/asm/current.h:13,
from ./include/linux/mutex.h:14,
from ./include/linux/notifier.h:14,
from ./include/linux/clk.h:14,
from drivers/spi/spi-dw-bt1.c:12:
In function 'memcpy',
inlined from 'dw_spi_bt1_dirmap_copy_from_map' at drivers/spi/spi-dw-bt1.c:87:3:
./include/linux/fortify-string.h:20:29: warning: '__builtin_memcpy' offset 4 is out of the bounds [0, 4] of object 'data' with type 'u32' {aka 'unsigned int'} [-Warray-bounds]
20 | #define __underlying_memcpy __builtin_memcpy
| ^
./include/linux/fortify-string.h:191:9: note: in expansion of macro '__underlying_memcpy'
191 | return __underlying_memcpy(p, q, size);
| ^~~~~~~~~~~~~~~~~~~
drivers/spi/spi-dw-bt1.c: In function 'dw_spi_bt1_dirmap_copy_from_map':
drivers/spi/spi-dw-bt1.c:77:6: note: 'data' declared here
77 | u32 data;
| ^~~~
Addresses-Coverity: CID 1497771 Out-of-bounds access
Fixes: abf0090753 ("spi: dw: Add Baikal-T1 SPI Controller glue driver")
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Acked-by: Serge Semin <fancer.lancer@gmail.com>
Link: https://lore.kernel.org/r/20210211203714.1929862-1-keescook@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Use the newly introduced spi_mem_dtr_supports_op() to check DTR op
support. This means the buswidth check does not need to be replicated.
It also happens to fix a bug where STR ops with a 2-byte opcode would be
reported as supported.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Link: https://lore.kernel.org/r/20210204141218.32229-2-p.yadav@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
spi_mem_default_supports_op() rejects DTR ops by default to ensure that
the controller drivers that haven't been updated with DTR support
continue to reject them. It also makes sure that controllers that don't
support DTR mode at all (which is most of them at the moment) also
reject them.
This means that controller drivers that want to support DTR mode can't
use spi_mem_default_supports_op(). Driver authors have to roll their own
supports_op() function and mimic the buswidth checks. See
spi-cadence-quadspi.c for example. Or even worse, driver authors might
skip it completely or get it wrong.
Add spi_mem_dtr_supports_op(). It provides a basic sanity check for DTR
ops and performs the buswidth requirement check. Move the logic for
checking buswidth in spi_mem_default_supports_op() to a separate
function so the logic is not repeated twice.
Signed-off-by: Pratyush Yadav <p.yadav@ti.com>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/r/20210204141218.32229-1-p.yadav@ti.com
Signed-off-by: Mark Brown <broonie@kernel.org>
It is safer to disable the QSPI IP at suspend, in order to avoid
possible impact of glitches on the internal FSMs. This is a theoretical
fix, there were no problems seen as of now. Tested on sama5d2 and
sam9x60 versions of the IP.
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Link: https://lore.kernel.org/r/20210210135428.204134-1-tudor.ambarus@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Add IDs for the controllers found on Intel Lynxpoint.
In particular it's Macbook Air 6,2 devices.
Cc: Leif Liddy <leif.liddy@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210208163816.22147-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Wildcat Point has two SPI controllers and added one is actually second one.
Fix the numbering by adding the description of the first one.
Fixes: caba248db2 ("spi: spi-pxa2xx-pci: Add ID and driver type for WildcatPoint PCH")
Cc: Leif Liddy <leif.liddy@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20210208163816.22147-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Some controllers only have one HW CS, if support multiple devices, other devices need
to use SW CS.
This patch adds the support of both HW and SW CS via cs_gpio.
leilk.liu (3):
spi: add power control when set_cs_timing
spi: support CS timing for HW & SW mode
spi: mediatek: add set_cs_timing support
drivers/spi/spi-mt65xx.c | 72 +++++++++++++++++++++++++++++++---------
drivers/spi/spi.c | 32 +++++++++++++++---
2 files changed, 83 insertions(+), 21 deletions(-)
--
2.18.0
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.orghttp://lists.infradead.org/mailman/listinfo/linux-arm-kernel
- Fix a crash when sysfs accesses race 'dimm' driver probe/remove.
- Fix a regression in 'resource' attribute visibility necessary for
mapping badblocks and other physical address interrogations.
- Fix some flexible array warnings
- Expand the unit test infrastructure for non-ACPI platforms
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Merge tag 'libnvdimm-fixes-5.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm fixes from Dan Williams:
"A fix for a crash scenario that has been present since the initial
merge, a minor regression in sysfs attribute visibility, and a fix for
some flexible array warnings.
The bulk of this pull is an update to the libnvdimm unit test
infrastructure to test non-ACPI platforms. Given there is zero
regression risk for test updates, and the tests enable validation of
bits headed towards the next merge window, I saw no reason to hold the
new tests back. Santosh originally submitted this before the v5.11
window opened.
Summary:
- Fix a crash when sysfs accesses race 'dimm' driver probe/remove.
- Fix a regression in 'resource' attribute visibility necessary for
mapping badblocks and other physical address interrogations.
- Fix some flexible array warnings
- Expand the unit test infrastructure for non-ACPI platforms"
* tag 'libnvdimm-fixes-5.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
libnvdimm/dimm: Avoid race between probe and available_slots_show()
ndtest: Add papr health related flags
ndtest: Add nvdimm control functions
ndtest: Add regions and mappings to the test buses
ndtest: Add dimm attributes
ndtest: Add dimms to the two buses
ndtest: Add compatability string to treat it as PAPR family
testing/nvdimm: Add test module for non-nfit platforms
libnvdimm/namespace: Fix visibility of namespace resource attribute
libnvdimm/pmem: Remove unused header
ACPI: NFIT: Fix flexible_array.cocci warnings
- fix a 32 vs 64-bit padding issue in the new benchmark code
(Barry Song)
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Merge tag 'dma-mapping-5.11-2' of git://git.infradead.org/users/hch/dma-mapping
Pull dma-mapping fix from Christoph Hellwig:
"Fix a 32 vs 64-bit padding issue in the new benchmark code (Barry
Song)"
* tag 'dma-mapping-5.11-2' of git://git.infradead.org/users/hch/dma-mapping:
dma-mapping: benchmark: use u8 for reserved field in uAPI structure
- A fix for MSI activation of PCI endpoints with multiple MSIs.
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Merge tag 'irq_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq fixes from Borislav Petkov:
- Prevent device managed IRQ allocation helpers from returning IRQ 0
- A fix for MSI activation of PCI endpoints with multiple MSIs
* tag 'irq_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
genirq: Prevent [devm_]irq_alloc_desc from returning irq 0
genirq/msi: Activate Multi-MSI early when MSI_FLAG_ACTIVATE_EARLY is set
redirection range specification before the API has been made official in 5.11.
- Ensure tasks using the generic syscall code do trap after returning
from a syscall when single-stepping is requested.
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Merge tag 'core_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull syscall entry fixes from Borislav Petkov:
- For syscall user dispatch, separate prctl operation from syscall
redirection range specification before the API has been made official
in 5.11.
- Ensure tasks using the generic syscall code do trap after returning
from a syscall when single-stepping is requested.
* tag 'core_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
entry: Use different define for selector variable in SUD
entry: Ensure trap after single-step on system call return
a bunch of problems.
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Merge tag 'sched_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fix from Borislav Petkov:
"Revert an attempt to not spread IRQ threads on isolated CPUs which has
a bunch of problems"
* tag 'sched_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
Revert "lib: Restrict cpumask_local_spread to houskeeping CPUs"
and trigger suspend assertion checks in the i2c subsystem.
- Correct a previous RTC validation change to check only bit 6 in register D
because some Intel machines use bits 0-5.
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Merge tag 'timers_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer fixes from Borislav Petkov:
"Two more timers-related fixes for v5.11:
- Use a freezable workqueue for RTC sync because the sync can happen
at any time and trigger suspend assertion checks in the i2c
subsystem.
- Correct a previous RTC validation change to check only bit 6 in
register D because some Intel machines use bits 0-5"
* tag 'timers_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
ntp: Use freezable workqueue for RTC synchronization
rtc: mc146818: Dont test for bit 0-5 in Register D
with certain kernel configs and LLVM.
- Disable setting breakpoints on facilities involved in #DB exception handling
to avoid infinite loops.
- Add extra serialization to non-serializing MSRs (IA32_TSC_DEADLINE and
x2 APIC MSRs) to adhere to SDM's recommendation and avoid any theoretical
issues.
- Re-add the EPB MSR reading on turbostat so that it works on older
kernels which don't have the corresponding EPB sysfs file.
- Add Alder Lake to the list of CPUs which support split lock.
- Fix %dr6 register handling in order to be able to set watchpoints with gdb
again.
- Disable CET instrumentation in the kernel so that gcc doesn't add
ENDBR64 to kernel code and thus confuse tracing.
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Merge tag 'x86_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Borislav Petkov:
"I hope this is the last batch of x86/urgent updates for this round:
- Remove superfluous EFI PGD range checks which lead to those
assertions failing with certain kernel configs and LLVM.
- Disable setting breakpoints on facilities involved in #DB exception
handling to avoid infinite loops.
- Add extra serialization to non-serializing MSRs (IA32_TSC_DEADLINE
and x2 APIC MSRs) to adhere to SDM's recommendation and avoid any
theoretical issues.
- Re-add the EPB MSR reading on turbostat so that it works on older
kernels which don't have the corresponding EPB sysfs file.
- Add Alder Lake to the list of CPUs which support split lock.
- Fix %dr6 register handling in order to be able to set watchpoints
with gdb again.
- Disable CET instrumentation in the kernel so that gcc doesn't add
ENDBR64 to kernel code and thus confuse tracing"
* tag 'x86_urgent_for_v5.11_rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/efi: Remove EFI PGD build time checks
x86/debug: Prevent data breakpoints on cpu_dr7
x86/debug: Prevent data breakpoints on __per_cpu_offset
x86/apic: Add extra serialization for non-serializing MSRs
tools/power/turbostat: Fallback to an MSR read for EPB
x86/split_lock: Enable the split lock feature on another Alder Lake CPU
x86/debug: Fix DR6 handling
x86/build: Disable CET instrumentation in the kernel
- Use the 'python3' command to invoke python scripts because some
distributions do not provide the 'python' command any more.
- Clean-up and update documents
- Use pkg-config to search libcrypto
- Fix duplicated debug flags
- Ignore some more stubs in scripts/kallsyms.c
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Merge tag 'kbuild-fixes-v5.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull Kbuild fixes from Masahiro Yamada:
- Use the 'python3' command to invoke python scripts because some
distributions do not provide the 'python' command any more.
- Clean-up and update documents
- Use pkg-config to search libcrypto
- Fix duplicated debug flags
- Ignore some more stubs in scripts/kallsyms.c
* tag 'kbuild-fixes-v5.11-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
kallsyms: fix nonconverging kallsyms table with lld
kbuild: fix duplicated flags in DEBUG_CFLAGS
scripts/clang-tools: switch explicitly to Python 3
kbuild: remove PYTHON variable
Documentation/llvm: Add a section about supported architectures
Revert "checkpatch: add check for keyword 'boolean' in Kconfig definitions"
scripts: use pkg-config to locate libcrypto
kconfig: mconf: fix HOSTCC call
doc: gcc-plugins: update gcc-plugins.rst
kbuild: simplify GCC_PLUGINS enablement in dummy-tools/gcc
Documentation/Kbuild: Remove references to gcc-plugin.sh
scripts: switch explicitly to Python 3
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Merge tag '5.11-rc6-smb3' of git://git.samba.org/sfrench/cifs-2.6
Pull cifs fixes from Steve French:
"Three small smb3 fixes for stable"
* tag '5.11-rc6-smb3' of git://git.samba.org/sfrench/cifs-2.6:
cifs: report error instead of invalid when revalidating a dentry fails
smb3: fix crediting for compounding when only one request in flight
smb3: Fix out-of-bounds bug in SMB2_negotiate()
I have a handful of fixes for this week:
* A fix to avoid evalating the VA twice in virt_addr_valid, which fixes
some WARNs under DEBUG_VIRTUAL.
* Two fixes related to STRICT_KERNEL_RWX: one that fixes some
permissions when strict is disabled, and one to fix some alignment
issues when strict is enabled.
* A fix to disallow the selection of MAXPHYSMEM_2GB on RV32, which isn't
valid any more but may still show up in some oldconfigs.
We still have the HiFive Unleashed ethernet phy reset regression, so
there will likely be something coming next week.
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Merge tag 'riscv-for-linus-5.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V fixes from Palmer Dabbelt:
"A handful of fixes for this week:
- A fix to avoid evalating the VA twice in virt_addr_valid, which
fixes some WARNs under DEBUG_VIRTUAL.
- Two fixes related to STRICT_KERNEL_RWX: one that fixes some
permissions when strict is disabled, and one to fix some alignment
issues when strict is enabled.
- A fix to disallow the selection of MAXPHYSMEM_2GB on RV32, which
isn't valid any more but may still show up in some oldconfigs.
We still have the HiFive Unleashed ethernet phy reset regression, so
there will likely be something coming next week"
* tag 'riscv-for-linus-5.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
RISC-V: Define MAXPHYSMEM_1GB only for RV32
riscv: Align on L1_CACHE_BYTES when STRICT_KERNEL_RWX
RISC-V: Fix .init section permission update
riscv: virt_addr_valid must check the address belongs to linear mapping
A fix for a change we made to __kernel_sigtramp_rt64() which confused glibc's
backtrace logic, and also changed the semantics of that symbol, which was
arguably an ABI break.
A fix for a stack overwrite in our VSX instruction emulation.
A couple of fixes for the Makefile logic in the new C VDSO.
Thanks to: Masahiro Yamada, Naveen N. Rao, Raoni Fassina Firmino, Ravi Bangoria.
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Merge tag 'powerpc-5.11-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux
Pull powerpc fixes from Michael Ellerman:
- A fix for a change we made to __kernel_sigtramp_rt64() which confused
glibc's backtrace logic, and also changed the semantics of that
symbol, which was arguably an ABI break.
- A fix for a stack overwrite in our VSX instruction emulation.
- A couple of fixes for the Makefile logic in the new C VDSO.
Thanks to Masahiro Yamada, Naveen N. Rao, Raoni Fassina Firmino, and
Ravi Bangoria.
* tag 'powerpc-5.11-7' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux:
powerpc/64/signal: Fix regression in __kernel_sigtramp_rt64() semantics
powerpc/vdso64: remove meaningless vgettimeofday.o build rule
powerpc/vdso: fix unnecessary rebuilds of vgettimeofday.o
powerpc/sstep: Fix array out of bound warning
Here are some small, last-minute, USB driver fixes for 5.11-rc7
They all resolve issues reported, or are a few new device ids for some
drivers. They include:
- new device ids for some usb-serial drivers
- xhci fixes for a variety of reported problems
- dwc3 driver bugfixes
- dwc2 driver bugfixes
- usblp driver bugfix
- thunderbolt bugfix
- few other tiny fixes
All have been in linux-next with no reported issues.
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'usb-5.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
Pull USB fixes from Greg KH:
"Here are some small, last-minute, USB driver fixes for 5.11-rc7
They all resolve issues reported, or are a few new device ids for some
drivers. They include:
- new device ids for some usb-serial drivers
- xhci fixes for a variety of reported problems
- dwc3 driver bugfixes
- dwc2 driver bugfixes
- usblp driver bugfix
- thunderbolt bugfix
- few other tiny fixes
All have been in linux-next with no reported issues"
* tag 'usb-5.11-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb:
usb: dwc2: Fix endpoint direction check in ep_from_windex
usb: dwc3: fix clock issue during resume in OTG mode
xhci: fix bounce buffer usage for non-sg list case
usb: host: xhci: mvebu: make USB 3.0 PHY optional for Armada 3720
usb: xhci-mtk: break loop when find the endpoint to drop
usb: xhci-mtk: skip dropping bandwidth of unchecked endpoints
usb: renesas_usbhs: Clear pipe running flag in usbhs_pkt_pop()
USB: gadget: legacy: fix an error code in eth_bind()
thunderbolt: Fix possible NULL pointer dereference in tb_acpi_add_link()
USB: serial: option: Adding support for Cinterion MV31
usb: xhci-mtk: fix unreleased bandwidth data
usb: gadget: aspeed: add missing of_node_put
USB: usblp: don't call usb_set_interface if there's a single alt
USB: serial: cp210x: add pid/vid for WSDA-200-USB
USB: serial: cp210x: add new VID/PID for supporting Teraoka AD2000
One fix in drivers (lpfc) that stops an oops on resource exhaustion.
Signed-off-by: James E.J. Bottomley <jejb@linux.ibm.com>
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Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI fix from James Bottomley:
"One fix in drivers (lpfc) that stops an oops on resource exhaustion"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: lpfc: Fix EEH encountering oops with NVMe traffic
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Merge tag 'block-5.11-2021-02-05' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe:
"A few small regression fixes:
- NVMe pull request from Christoph:
- more quirks for buggy devices (Thorsten Leemhuis, Claus Stovgaard)
- update the email address for Keith (Keith Busch)
- fix an out of bounds access in nvmet-tcp (Sagi Grimberg)
- Regression fix for BFQ shallow depth calculations introduced in
this merge window (Lin)"
* tag 'block-5.11-2021-02-05' of git://git.kernel.dk/linux-block:
nvmet-tcp: fix out-of-bounds access when receiving multiple h2cdata PDUs
bfq-iosched: Revert "bfq: Fix computation of shallow depth"
update the email address for Keith Bush
nvme-pci: ignore the subsysem NQN on Phison E16
nvme-pci: avoid the deepest sleep state on Kingston A2000 SSDs
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Merge tag 'io_uring-5.11-2021-02-05' of git://git.kernel.dk/linux-block
Pull io_uring fixes from Jens Axboe:
"Two small fixes that should go into 5.11:
- task_work resource drop fix (Pavel)
- identity COW fix (Xiaoguang)"
* tag 'io_uring-5.11-2021-02-05' of git://git.kernel.dk/linux-block:
io_uring: drop mm/files between task_work_submit
io_uring: don't modify identity's files uncess identity is cowed
With CONFIG_X86_5LEVEL, CONFIG_UBSAN and CONFIG_UBSAN_UNSIGNED_OVERFLOW
enabled, clang fails the build with
x86_64-linux-ld: arch/x86/platform/efi/efi_64.o: in function `efi_sync_low_kernel_mappings':
efi_64.c:(.text+0x22c): undefined reference to `__compiletime_assert_354'
which happens due to -fsanitize=unsigned-integer-overflow being enabled:
-fsanitize=unsigned-integer-overflow: Unsigned integer overflow, where
the result of an unsigned integer computation cannot be represented
in its type. Unlike signed integer overflow, this is not undefined
behavior, but it is often unintentional. This sanitizer does not check
for lossy implicit conversions performed before such a computation
(see -fsanitize=implicit-conversion).
and that fires when the (intentional) EFI_VA_START/END defines overflow
an unsigned long, leading to the assertion expressions not getting
optimized away (on GCC they do)...
However, those checks are superfluous: the runtime services mapping
code already makes sure the ranges don't overshoot EFI_VA_END as the
EFI mapping range is hardcoded. On each runtime services call, it is
switched to the EFI-specific PGD and even if mappings manage to escape
that last PGD, this won't remain unnoticed for long.
So rip them out.
See https://github.com/ClangBuiltLinux/linux/issues/256 for more info.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Link: http://lkml.kernel.org/r/20210107223424.4135538-1-arnd@kernel.org
Michael Kerrisk suggested that, from an API perspective, it is a bad
idea to share the PR_SYS_DISPATCH_ defines between the prctl operation
and the selector variable.
Therefore, define two new constants to be used by SUD's selector variable
and update the corresponding documentation and test cases.
While this changes the API syscall user dispatch has never been part of a
Linux release, it will show up for the first time in 5.11.
Suggested-by: Michael Kerrisk (man-pages) <mtk.manpages@gmail.com>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210205184321.2062251-1-krisman@collabora.com
Commit 2991552447 ("entry: Drop usage of TIF flags in the generic syscall
code") introduced a bug on architectures using the generic syscall entry
code, in which processes stopped by PTRACE_SYSCALL do not trap on syscall
return after receiving a TIF_SINGLESTEP.
The reason is that the meaning of TIF_SINGLESTEP flag is overloaded to
cause the trap after a system call is executed, but since the above commit,
the syscall call handler only checks for the SYSCALL_WORK flags on the exit
work.
Split the meaning of TIF_SINGLESTEP such that it only means single-step
mode, and create a new type of SYSCALL_WORK to request a trap immediately
after a syscall in single-step mode. In the current implementation, the
SYSCALL_WORK flag shadows the TIF_SINGLESTEP flag for simplicity.
Update x86 to flip this bit when a tracer enables single stepping.
Fixes: 2991552447 ("entry: Drop usage of TIF flags in the generic syscall code")
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Kyle Huey <me@kylehuey.com>
Link: https://lore.kernel.org/r/87h7mtc9pr.fsf_-_@collabora.com
This reverts commit 1abdfe706a.
This change is broken and not solving any problem it claims to solve.
Robin reported that cpumask_local_spread() now returns any cpu out of
cpu_possible_mask in case that NOHZ_FULL is disabled (runtime or compile
time). It can also return any offline or not-present CPU in the
housekeeping mask. Before that it was returning a CPU out of
online_cpu_mask.
While the function is racy against CPU hotplug if the caller does not
protect against it, the actual use cases are not caring much about it as
they use it mostly as hint for:
- the user space affinity hint which is unused by the kernel
- memory node selection which is just suboptimal
- network queue affinity which might fail but is handled gracefully
But the occasional fail vs. hotplug is very different from returning
anything from possible_cpu_mask which can have a large amount of offline
CPUs obviously.
The changelog of the commit claims:
"The current implementation of cpumask_local_spread() does not respect
the isolated CPUs, i.e., even if a CPU has been isolated for Real-Time
task, it will return it to the caller for pinning of its IRQ
threads. Having these unwanted IRQ threads on an isolated CPU adds up
to a latency overhead."
The only correct part of this changelog is:
"The current implementation of cpumask_local_spread() does not respect
the isolated CPUs."
Everything else is just disjunct from reality.
Reported-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Nitesh Narayan Lal <nitesh@redhat.com>
Cc: Marcelo Tosatti <mtosatti@redhat.com>
Cc: abelits@marvell.com
Cc: davem@davemloft.net
Link: https://lore.kernel.org/r/87y2g26tnt.fsf@nanos.tec.linutronix.de
Merge misc fixes from Andrew Morton:
"18 patches.
Subsystems affected by this patch series: mm (hugetlb, compaction,
vmalloc, shmem, memblock, pagecache, kasan, and hugetlb), mailmap,
gcov, ubsan, and MAINTAINERS"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
MAINTAINERS/.mailmap: use my @kernel.org address
mm: hugetlb: fix missing put_page in gather_surplus_pages()
ubsan: implement __ubsan_handle_alignment_assumption
kasan: make addr_has_metadata() return true for valid addresses
kasan: add explicit preconditions to kasan_report()
mm/filemap: add missing mem_cgroup_uncharge() to __add_to_page_cache_locked()
mailmap: add entries for Manivannan Sadhasivam
mailmap: fix name/email for Viresh Kumar
memblock: do not start bottom-up allocations with kernel_end
mm: thp: fix MADV_REMOVE deadlock on shmem THP
init/gcov: allow CONFIG_CONSTRUCTORS on UML to fix module gcov
mm/vmalloc: separate put pages and flush VM flags
mm, compaction: move high_pfn to the for loop scope
mm: migrate: do not migrate HugeTLB page whose refcount is one
mm: hugetlb: remove VM_BUG_ON_PAGE from page_huge_active
mm: hugetlb: fix a race between isolating and freeing page
mm: hugetlb: fix a race between freeing and dissolving the page
mm: hugetlbfs: fix cannot migrate the fallocated HugeTLB page
Since commit a85a6c86c2 ("driver core: platform: Clarify that IRQ 0
is invalid"), having a linux-irq with number 0 will trigger a WARN()
when calling platform_get_irq*() to retrieve that linux-irq.
Since [devm_]irq_alloc_desc allocs a single irq and since irq 0 is not used
on some systems, it can return 0, triggering that WARN(). This happens
e.g. on Intel Bay Trail and Cherry Trail devices using the LPE audio engine
for HDMI audio:
0 is an invalid IRQ number
WARNING: CPU: 3 PID: 472 at drivers/base/platform.c:238 platform_get_irq_optional+0x108/0x180
Modules linked in: snd_hdmi_lpe_audio(+) ...
Call Trace:
platform_get_irq+0x17/0x30
hdmi_lpe_audio_probe+0x4a/0x6c0 [snd_hdmi_lpe_audio]
---[ end trace ceece38854223a0b ]---
Change the 'from' parameter passed to __[devm_]irq_alloc_descs() by the
[devm_]irq_alloc_desc macros from 0 to 1, so that these macros will no
longer return 0.
Fixes: a85a6c86c2 ("driver core: platform: Clarify that IRQ 0 is invalid")
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20201221185647.226146-1-hdegoede@redhat.com
Assuming
- //HOST/a is mounted on /mnt
- //HOST/b is mounted on /mnt/b
On a slow connection, running 'df' and killing it while it's
processing /mnt/b can make cifs_get_inode_info() returns -ERESTARTSYS.
This triggers the following chain of events:
=> the dentry revalidation fail
=> dentry is put and released
=> superblock associated with the dentry is put
=> /mnt/b is unmounted
This patch makes cifs_d_revalidate() return the error instead of 0
(invalid) when cifs_revalidate_dentry() fails, except for ENOENT (file
deleted) and ESTALE (file recreated).
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Suggested-by: Shyam Prasad N <nspmangalore@gmail.com>
Reviewed-by: Shyam Prasad N <nspmangalore@gmail.com>
CC: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
We do not expect to receive spurious interrupts so rise a warning
if it happens.
RX overrun is an error condition that signals a corrupted RX
stream both in dma and in irq modes. Report the error and
abort the transfer in either cases.
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/1612551572-495-9-git-send-email-alain.volmat@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Replace SPI_1HZ_NS private constant with NSEC_PER_SEC, which is easier
to read and understand.
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/1612551572-495-8-git-send-email-alain.volmat@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Defer the probe operation when a reset controller device is expected
but have not yet been probed.
This change replaces use of devm_reset_control_get_exclusive() with
devm_reset_control_get_optional_exclusive() as reset controller is
optional which is now explicitly stated.
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/1612551572-495-7-git-send-email-alain.volmat@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Remove reset controller device reference from the device private
structure since it is used only at probe time and can be discarded
once used to reset the SPI device.
Signed-off-by: Etienne Carriere <etienne.carriere@st.com>
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/1612551572-495-6-git-send-email-alain.volmat@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Ensure that messages given to transfer_one handler can actually be
handled by it. For that purpose rely on the SPI framework
spi_split_transfers_maxsize function to split messages whenever necessary.
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/1612551572-495-5-git-send-email-alain.volmat@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
To avoid defining shift and mask separately and hand-coding the bit
manipulation, use the bitfield macros.
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://lore.kernel.org/r/1612551572-495-4-git-send-email-alain.volmat@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
local_db_save() is called at the start of exc_debug_kernel(), reads DR7 and
disables breakpoints to prevent recursion.
When running in a guest (X86_FEATURE_HYPERVISOR), local_db_save() reads the
per-cpu variable cpu_dr7 to check whether a breakpoint is active or not
before it accesses DR7.
A data breakpoint on cpu_dr7 therefore results in infinite #DB recursion.
Disallow data breakpoints on cpu_dr7 to prevent that.
Fixes: 84b6a3491567a("x86/entry: Optimize local_db_save() for virt")
Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210204152708.21308-2-jiangshanlai@gmail.com
When FSGSBASE is enabled, paranoid_entry() fetches the per-CPU GSBASE value
via __per_cpu_offset or pcpu_unit_offsets.
When a data breakpoint is set on __per_cpu_offset[cpu] (read-write
operation), the specific CPU will be stuck in an infinite #DB loop.
RCU will try to send an NMI to the specific CPU, but it is not working
either since NMI also relies on paranoid_entry(). Which means it's
undebuggable.
Fixes: eaad981291ee3("x86/entry/64: Introduce the FIND_PERCPU_BASE macro")
Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210204152708.21308-1-jiangshanlai@gmail.com
Use my @kernel.org for all points of contact so that I am always
accessible.
Link: https://lkml.kernel.org/r/20210126212730.2097108-1-nathan@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
