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Here's the main documentation changes for 5.5:

Browse Source 
- Various kerneldoc script enhancements.
 
  - More RST conversions; those are slowing down as we run out of things to
    convert, but we're a ways from done still.
 
  - Dan's "maintainer profile entry" work landed at last.  Now we just need
    to get maintainers to fill in the profiles...
 
  - A reworking of the parallel build setup to work better with a variety of
    systems (and to not take over huge systems entirely in particular).
 
  - The MAINTAINERS file is now converted to RST during the build.
    Hopefully nobody ever tries to print this thing, or they will need to
    load a lot of paper.
 
  - A script and documentation making it easy for maintainers to add Link:
    tags at commit time.
 
 Also included is the removal of a bunch of spurious CR characters.
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Merge tag 'docs-5.5a' of git://git.lwn.net/linux

Pull Documentation updates from Jonathan Corbet:
 "Here are the main documentation changes for 5.5:

   - Various kerneldoc script enhancements.

   - More RST conversions; those are slowing down as we run out of
     things to convert, but we're a ways from done still.

   - Dan's "maintainer profile entry" work landed at last. Now we just
     need to get maintainers to fill in the profiles...

   - A reworking of the parallel build setup to work better with a
     variety of systems (and to not take over huge systems entirely in
     particular).

   - The MAINTAINERS file is now converted to RST during the build.
     Hopefully nobody ever tries to print this thing, or they will need
     to load a lot of paper.

   - A script and documentation making it easy for maintainers to add
     Link: tags at commit time.

  Also included is the removal of a bunch of spurious CR characters"

* tag 'docs-5.5a' of git://git.lwn.net/linux: (91 commits)
  docs: remove a bunch of stray CRs
  docs: fix up the maintainer profile document
  libnvdimm, MAINTAINERS: Maintainer Entry Profile
  Maintainer Handbook: Maintainer Entry Profile
  MAINTAINERS: Reclaim the P: tag for Maintainer Entry Profile
  docs, parallelism: Rearrange how jobserver reservations are made
  docs, parallelism: Do not leak blocking mode to other readers
  docs, parallelism: Fix failure path and add comment
  Documentation: Remove bootmem_debug from kernel-parameters.txt
  Documentation: security: core.rst: fix warnings
  Documentation/process/howto/kokr: Update for 4.x -> 5.x versioning
  Documentation/translation: Use Korean for Korean translation title
  docs/memory-barriers.txt: Remove remaining references to mmiowb()
  docs/memory-barriers.txt/kokr: Update I/O section to be clearer about CPU vs thread
  docs/memory-barriers.txt/kokr: Fix style, spacing and grammar in I/O section
  Documentation/kokr: Kill all references to mmiowb()
  docs/memory-barriers.txt/kokr: Rewrite "KERNEL I/O BARRIER EFFECTS" section
  docs: Add initial documentation for devfreq
  Documentation: Document how to get links with git am
  docs: Add request_irq() documentation
  ...
This commit is contained in:
Linus Torvalds 2019-12-02 11:51:02 -08:00
commit 937d6eefc7
89 changed files with 2556 additions and 777 deletions
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1
.mailmap
View File

@ -156,6 +156,7 @@ Mark Brown <broonie@sirena.org.uk>
Mark Yao <markyao0591@gmail.com> <mark.yao@rock-chips.com>
Martin Kepplinger <martink@posteo.de> <martin.kepplinger@theobroma-systems.com>
Martin Kepplinger <martink@posteo.de> <martin.kepplinger@ginzinger.com>
Martin Kepplinger <martink@posteo.de> <martin.kepplinger@puri.sm>
Mathieu Othacehe <m.othacehe@gmail.com>
Matthew Wilcox <willy@infradead.org> <matthew.r.wilcox@intel.com>
Matthew Wilcox <willy@infradead.org> <matthew@wil.cx>

3
CREDITS
View File

@ -1875,8 +1875,9 @@ S: The Netherlands
N: Martin Kepplinger
E: martink@posteo.de
E: martin.kepplinger@ginzinger.com
E: martin.kepplinger@puri.sm
W: http://www.martinkepplinger.com
P: 4096R/5AB387D3 F208 2B88 0F9E 4239 3468 6E3F 5003 98DF 5AB3 87D3
D: mma8452 accelerators iio driver
D: pegasus_notetaker input driver
D: Kernel fixes and cleanups

183
Documentation/ABI/testing/sysfs-bus-coresight-devices-etm4x
View File

@ -1,4 +1,4 @@
What: /sys/bus/coresight/devices/<memory_map>.etm/enable_source
What: /sys/bus/coresight/devices/etm<N>/enable_source
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
@ -8,82 +8,82 @@ Description: (RW) Enable/disable tracing on this specific trace entiry.
of coresight components linking the source to the sink is
configured and managed automatically by the coresight framework.
What: /sys/bus/coresight/devices/<memory_map>.etm/cpu
What: /sys/bus/coresight/devices/etm<N>/cpu
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) The CPU this tracing entity is associated with.
What: /sys/bus/coresight/devices/<memory_map>.etm/nr_pe_cmp
What: /sys/bus/coresight/devices/etm<N>/nr_pe_cmp
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Indicates the number of PE comparator inputs that are
available for tracing.
What: /sys/bus/coresight/devices/<memory_map>.etm/nr_addr_cmp
What: /sys/bus/coresight/devices/etm<N>/nr_addr_cmp
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Indicates the number of address comparator pairs that are
available for tracing.
What: /sys/bus/coresight/devices/<memory_map>.etm/nr_cntr
What: /sys/bus/coresight/devices/etm<N>/nr_cntr
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Indicates the number of counters that are available for
tracing.
What: /sys/bus/coresight/devices/<memory_map>.etm/nr_ext_inp
What: /sys/bus/coresight/devices/etm<N>/nr_ext_inp
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Indicates how many external inputs are implemented.
What: /sys/bus/coresight/devices/<memory_map>.etm/numcidc
What: /sys/bus/coresight/devices/etm<N>/numcidc
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Indicates the number of Context ID comparators that are
available for tracing.
What: /sys/bus/coresight/devices/<memory_map>.etm/numvmidc
What: /sys/bus/coresight/devices/etm<N>/numvmidc
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Indicates the number of VMID comparators that are available
for tracing.
What: /sys/bus/coresight/devices/<memory_map>.etm/nrseqstate
What: /sys/bus/coresight/devices/etm<N>/nrseqstate
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Indicates the number of sequencer states that are
implemented.
What: /sys/bus/coresight/devices/<memory_map>.etm/nr_resource
What: /sys/bus/coresight/devices/etm<N>/nr_resource
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Indicates the number of resource selection pairs that are
available for tracing.
What: /sys/bus/coresight/devices/<memory_map>.etm/nr_ss_cmp
What: /sys/bus/coresight/devices/etm<N>/nr_ss_cmp
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Indicates the number of single-shot comparator controls that
are available for tracing.
What: /sys/bus/coresight/devices/<memory_map>.etm/reset
What: /sys/bus/coresight/devices/etm<N>/reset
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (W) Cancels all configuration on a trace unit and set it back
to its boot configuration.
What: /sys/bus/coresight/devices/<memory_map>.etm/mode
What: /sys/bus/coresight/devices/etm<N>/mode
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
@ -91,302 +91,349 @@ Description: (RW) Controls various modes supported by this ETM, for example
P0 instruction tracing, branch broadcast, cycle counting and
context ID tracing.
What: /sys/bus/coresight/devices/<memory_map>.etm/pe
What: /sys/bus/coresight/devices/etm<N>/pe
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls which PE to trace.
What: /sys/bus/coresight/devices/<memory_map>.etm/event
What: /sys/bus/coresight/devices/etm<N>/event
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls the tracing of arbitrary events from bank 0 to 3.
What: /sys/bus/coresight/devices/<memory_map>.etm/event_instren
What: /sys/bus/coresight/devices/etm<N>/event_instren
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls the behavior of the events in bank 0 to 3.
What: /sys/bus/coresight/devices/<memory_map>.etm/event_ts
What: /sys/bus/coresight/devices/etm<N>/event_ts
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls the insertion of global timestamps in the trace
streams.
What: /sys/bus/coresight/devices/<memory_map>.etm/syncfreq
What: /sys/bus/coresight/devices/etm<N>/syncfreq
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls how often trace synchronization requests occur.
What: /sys/bus/coresight/devices/<memory_map>.etm/cyc_threshold
What: /sys/bus/coresight/devices/etm<N>/cyc_threshold
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Sets the threshold value for cycle counting.
What: /sys/bus/coresight/devices/<memory_map>.etm/bb_ctrl
What: /sys/bus/coresight/devices/etm<N>/bb_ctrl
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls which regions in the memory map are enabled to
use branch broadcasting.
What: /sys/bus/coresight/devices/<memory_map>.etm/event_vinst
What: /sys/bus/coresight/devices/etm<N>/event_vinst
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls instruction trace filtering.
What: /sys/bus/coresight/devices/<memory_map>.etm/s_exlevel_vinst
What: /sys/bus/coresight/devices/etm<N>/s_exlevel_vinst
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) In Secure state, each bit controls whether instruction
tracing is enabled for the corresponding exception level.
What: /sys/bus/coresight/devices/<memory_map>.etm/ns_exlevel_vinst
What: /sys/bus/coresight/devices/etm<N>/ns_exlevel_vinst
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) In non-secure state, each bit controls whether instruction
tracing is enabled for the corresponding exception level.
What: /sys/bus/coresight/devices/<memory_map>.etm/addr_idx
What: /sys/bus/coresight/devices/etm<N>/addr_idx
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Select which address comparator or pair (of comparators) to
work with.
What: /sys/bus/coresight/devices/<memory_map>.etm/addr_instdatatype
What: /sys/bus/coresight/devices/etm<N>/addr_instdatatype
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls what type of comparison the trace unit performs.
What: /sys/bus/coresight/devices/<memory_map>.etm/addr_single
What: /sys/bus/coresight/devices/etm<N>/addr_single
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Used to setup single address comparator values.
What: /sys/bus/coresight/devices/<memory_map>.etm/addr_range
What: /sys/bus/coresight/devices/etm<N>/addr_range
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Used to setup address range comparator values.
What: /sys/bus/coresight/devices/<memory_map>.etm/seq_idx
What: /sys/bus/coresight/devices/etm<N>/seq_idx
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Select which sequensor.
What: /sys/bus/coresight/devices/<memory_map>.etm/seq_state
What: /sys/bus/coresight/devices/etm<N>/seq_state
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Use this to set, or read, the sequencer state.
What: /sys/bus/coresight/devices/<memory_map>.etm/seq_event
What: /sys/bus/coresight/devices/etm<N>/seq_event
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Moves the sequencer state to a specific state.
What: /sys/bus/coresight/devices/<memory_map>.etm/seq_reset_event
What: /sys/bus/coresight/devices/etm<N>/seq_reset_event
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Moves the sequencer to state 0 when a programmed event
occurs.
What: /sys/bus/coresight/devices/<memory_map>.etm/cntr_idx
What: /sys/bus/coresight/devices/etm<N>/cntr_idx
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Select which counter unit to work with.
What: /sys/bus/coresight/devices/<memory_map>.etm/cntrldvr
What: /sys/bus/coresight/devices/etm<N>/cntrldvr
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) This sets or returns the reload count value of the
specific counter.
What: /sys/bus/coresight/devices/<memory_map>.etm/cntr_val
What: /sys/bus/coresight/devices/etm<N>/cntr_val
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) This sets or returns the current count value of the
specific counter.
What: /sys/bus/coresight/devices/<memory_map>.etm/cntr_ctrl
What: /sys/bus/coresight/devices/etm<N>/cntr_ctrl
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls the operation of the selected counter.
What: /sys/bus/coresight/devices/<memory_map>.etm/res_idx
What: /sys/bus/coresight/devices/etm<N>/res_idx
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Select which resource selection unit to work with.
What: /sys/bus/coresight/devices/<memory_map>.etm/res_ctrl
What: /sys/bus/coresight/devices/etm<N>/res_ctrl
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Controls the selection of the resources in the trace unit.
What: /sys/bus/coresight/devices/<memory_map>.etm/ctxid_idx
What: /sys/bus/coresight/devices/etm<N>/ctxid_idx
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Select which context ID comparator to work with.
What: /sys/bus/coresight/devices/<memory_map>.etm/ctxid_pid
What: /sys/bus/coresight/devices/etm<N>/ctxid_pid
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Get/Set the context ID comparator value to trigger on.
What: /sys/bus/coresight/devices/<memory_map>.etm/ctxid_masks
What: /sys/bus/coresight/devices/etm<N>/ctxid_masks
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Mask for all 8 context ID comparator value
registers (if implemented).
What: /sys/bus/coresight/devices/<memory_map>.etm/vmid_idx
What: /sys/bus/coresight/devices/etm<N>/vmid_idx
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Select which virtual machine ID comparator to work with.
What: /sys/bus/coresight/devices/<memory_map>.etm/vmid_val
What: /sys/bus/coresight/devices/etm<N>/vmid_val
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Get/Set the virtual machine ID comparator value to
trigger on.
What: /sys/bus/coresight/devices/<memory_map>.etm/vmid_masks
What: /sys/bus/coresight/devices/etm<N>/vmid_masks
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Mask for all 8 virtual machine ID comparator value
registers (if implemented).
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcoslsr
What: /sys/bus/coresight/devices/etm<N>/addr_exlevel_s_ns
Date: December 2019
KernelVersion: 5.5
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Set the Exception Level matching bits for secure and
non-secure exception levels.
What: /sys/bus/coresight/devices/etm<N>/vinst_pe_cmp_start_stop
Date: December 2019
KernelVersion: 5.5
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Access the start stop control register for PE input
comparators.
What: /sys/bus/coresight/devices/etm<N>/addr_cmp_view
Date: December 2019
KernelVersion: 5.5
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the current settings for the selected address
comparator.
What: /sys/bus/coresight/devices/etm<N>/sshot_idx
Date: December 2019
KernelVersion: 5.5
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Select the single shot control register to access.
What: /sys/bus/coresight/devices/etm<N>/sshot_ctrl
Date: December 2019
KernelVersion: 5.5
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Access the selected single shot control register.
What: /sys/bus/coresight/devices/etm<N>/sshot_status
Date: December 2019
KernelVersion: 5.5
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the current value of the selected single shot
status register.
What: /sys/bus/coresight/devices/etm<N>/sshot_pe_ctrl
Date: December 2019
KernelVersion: 5.5
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (RW) Access the selected single show PE comparator control
register.
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcoslsr
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the OS Lock Status Register (0x304).
The value it taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpdcr
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpdcr
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the Power Down Control Register
(0x310). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpdsr
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpdsr
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the Power Down Status Register
(0x314). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trclsr
What: /sys/bus/coresight/devices/etm<N>/mgmt/trclsr
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the SW Lock Status Register
(0xFB4). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcauthstatus
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcauthstatus
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the Authentication Status Register
(0xFB8). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcdevid
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcdevid
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the Device ID Register
(0xFC8). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcdevtype
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcdevtype
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the Device Type Register
(0xFCC). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr0
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpidr0
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the Peripheral ID0 Register
(0xFE0). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr1
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpidr1
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the Peripheral ID1 Register
(0xFE4). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr2
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpidr2
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the Peripheral ID2 Register
(0xFE8). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcpidr3
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcpidr3
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the Peripheral ID3 Register
(0xFEC). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trcconfig
What: /sys/bus/coresight/devices/etm<N>/mgmt/trcconfig
Date: February 2016
KernelVersion: 4.07
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the trace configuration register
(0x010) as currently set by SW.
What: /sys/bus/coresight/devices/<memory_map>.etm/mgmt/trctraceid
What: /sys/bus/coresight/devices/etm<N>/mgmt/trctraceid
Date: February 2016
KernelVersion: 4.07
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Print the content of the trace ID register (0x040).
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr0
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr0
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Returns the tracing capabilities of the trace unit (0x1E0).
The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr1
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr1
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Returns the tracing capabilities of the trace unit (0x1E4).
The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr2
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr2
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
@ -394,7 +441,7 @@ Description: (R) Returns the maximum size of the data value, data address,
VMID, context ID and instuction address in the trace unit
(0x1E8). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr3
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr3
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
@ -403,42 +450,42 @@ Description: (R) Returns the value associated with various resources
architecture specification for more details (0x1E8).
The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr4
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr4
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Returns how many resources the trace unit supports (0x1F0).
The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr5
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr5
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Returns how many resources the trace unit supports (0x1F4).
The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr8
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr8
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Returns the maximum speculation depth of the instruction
trace stream. (0x180). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr9
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr9
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Returns the number of P0 right-hand keys that the trace unit
can use (0x184). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr10
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr10
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
Description: (R) Returns the number of P1 right-hand keys that the trace unit
can use (0x188). The value is taken directly from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr11
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr11
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
@ -446,7 +493,7 @@ Description: (R) Returns the number of special P1 right-hand keys that the
trace unit can use (0x18C). The value is taken directly from
the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr12
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr12
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>
@ -454,7 +501,7 @@ Description: (R) Returns the number of conditional P1 right-hand keys that
the trace unit can use (0x190). The value is taken directly
from the HW.
What: /sys/bus/coresight/devices/<memory_map>.etm/trcidr/trcidr13
What: /sys/bus/coresight/devices/etm<N>/trcidr/trcidr13
Date: April 2015
KernelVersion: 4.01
Contact: Mathieu Poirier <mathieu.poirier@linaro.org>

6
Documentation/Makefile
View File

@ -13,7 +13,7 @@ endif
SPHINXBUILD = sphinx-build
SPHINXOPTS =
SPHINXDIRS = .
_SPHINXDIRS = $(patsubst $(srctree)/Documentation/%/conf.py,%,$(wildcard $(srctree)/Documentation/*/conf.py))
_SPHINXDIRS = $(patsubst $(srctree)/Documentation/%/index.rst,%,$(wildcard $(srctree)/Documentation/*/index.rst))
SPHINX_CONF = conf.py
PAPER =
BUILDDIR = $(obj)/output
@ -33,8 +33,6 @@ ifeq ($(HAVE_SPHINX),0)
else # HAVE_SPHINX
export SPHINXOPTS = $(shell perl -e 'open IN,"sphinx-build --version 2>&1 |"; while (<IN>) { if (m/([\d\.]+)/) { print "-jauto" if ($$1 >= "1.7") } ;} close IN')
# User-friendly check for pdflatex and latexmk
HAVE_PDFLATEX := $(shell if which $(PDFLATEX) >/dev/null 2>&1; then echo 1; else echo 0; fi)
HAVE_LATEXMK := $(shell if which latexmk >/dev/null 2>&1; then echo 1; else echo 0; fi)
@ -67,6 +65,8 @@ quiet_cmd_sphinx = SPHINX $@ --> file://$(abspath $(BUILDDIR)/$3/$4)
cmd_sphinx = $(MAKE) BUILDDIR=$(abspath $(BUILDDIR)) $(build)=Documentation/media $2 && \
PYTHONDONTWRITEBYTECODE=1 \
BUILDDIR=$(abspath $(BUILDDIR)) SPHINX_CONF=$(abspath $(srctree)/$(src)/$5/$(SPHINX_CONF)) \
$(PYTHON) $(srctree)/scripts/jobserver-exec \
$(SHELL) $(srctree)/Documentation/sphinx/parallel-wrapper.sh \
$(SPHINXBUILD) \
-b $2 \
-c $(abspath $(srctree)/$(src)) \

4
Documentation/admin-guide/LSM/SafeSetID.rst
View File

@ -56,7 +56,7 @@ setid capabilities from the application completely and refactor the process
spawning semantics in the application (e.g. by using a privileged helper program
to do process spawning and UID/GID transitions). Unfortunately, there are a
number of semantics around process spawning that would be affected by this, such
as fork() calls where the program doesn???t immediately call exec() after the
as fork() calls where the program doesn't immediately call exec() after the
fork(), parent processes specifying custom environment variables or command line
args for spawned child processes, or inheritance of file handles across a
fork()/exec(). Because of this, as solution that uses a privileged helper in
@ -72,7 +72,7 @@ own user namespace, and only approved UIDs/GIDs could be mapped back to the
initial system user namespace, affectively preventing privilege escalation.
Unfortunately, it is not generally feasible to use user namespaces in isolation,
without pairing them with other namespace types, which is not always an option.
Linux checks for capabilities based off of the user namespace that ???owns??? some
Linux checks for capabilities based off of the user namespace that "owns" some
entity. For example, Linux has the notion that network namespaces are owned by
the user namespace in which they were created. A consequence of this is that
capability checks for access to a given network namespace are done by checking

7
Documentation/admin-guide/cgroup-v2.rst
View File

@ -1120,8 +1120,9 @@ PAGE_SIZE multiple when read back.
Best-effort memory protection. If the memory usage of a
cgroup is within its effective low boundary, the cgroup's
memory won't be reclaimed unless memory can be reclaimed
from unprotected cgroups. Above the effective low boundary (or
memory won't be reclaimed unless there is no reclaimable
memory available in unprotected cgroups.
Above the effective low boundary (or
effective min boundary if it is higher), pages are reclaimed
proportionally to the overage, reducing reclaim pressure for
smaller overages.
@ -1925,7 +1926,7 @@ Cpuset Interface Files
It accepts only the following input values when written to.
"root" - a paritition root
"root" - a partition root
"member" - a non-root member of a partition
When set to be a partition root, the current cgroup is the

14
Documentation/driver-api/dell_rbu.rst → Documentation/admin-guide/dell_rbu.rst
View File

@ -1,11 +1,11 @@
=============================================================
Usage of the new open sourced rbu (Remote BIOS Update) driver
=============================================================
=========================================
Dell Remote BIOS Update driver (dell_rbu)
=========================================
Purpose
=======
Document demonstrating the use of the Dell Remote BIOS Update driver.
Document demonstrating the use of the Dell Remote BIOS Update driver
for updating BIOS images on Dell servers and desktops.
Scope
@ -37,7 +37,7 @@ maintains a link list of packets for reading them back.
If the dell_rbu driver is unloaded all the allocated memory is freed.
The rbu driver needs to have an application (as mentioned above)which will
The rbu driver needs to have an application (as mentioned above) which will
inform the BIOS to enable the update in the next system reboot.
The user should not unload the rbu driver after downloading the BIOS image
@ -71,7 +71,7 @@ be downloaded. It is done as below::
echo XXXX > /sys/devices/platform/dell_rbu/packet_size
In the packet update mechanism, the user needs to create a new file having
packets of data arranged back to back. It can be done as follows
packets of data arranged back to back. It can be done as follows:
The user creates packets header, gets the chunk of the BIOS image and
places it next to the packetheader; now, the packetheader + BIOS image chunk
added together should match the specified packet_size. This makes one
@ -114,7 +114,7 @@ The entries can be recreated by doing the following::
echo init > /sys/devices/platform/dell_rbu/image_type
.. note:: echoing init in image_type does not change it original value.
.. note:: echoing init in image_type does not change its original value.
Also the driver provides /sys/devices/platform/dell_rbu/data readonly file to
read back the image downloaded.

243
Documentation/admin-guide/device-mapper/dm-dust.txt → Documentation/admin-guide/device-mapper/dm-dust.rst
View File

@ -31,218 +31,233 @@ configured "bad blocks" will be treated as bad, or bypassed.
This allows the pre-writing of test data and metadata prior to
simulating a "failure" event where bad sectors start to appear.
Table parameters:
-----------------
Table parameters
----------------
<device_path> <offset> <blksz>
Mandatory parameters:
<device_path>: path to the block device.
<offset>: offset to data area from start of device_path
<blksz>: block size in bytes
<device_path>:
Path to the block device.
<offset>:
Offset to data area from start of device_path
<blksz>:
Block size in bytes
(minimum 512, maximum 1073741824, must be a power of 2)
Usage instructions:
-------------------
Usage instructions
------------------
First, find the size (in 512-byte sectors) of the device to be used:
First, find the size (in 512-byte sectors) of the device to be used::
$ sudo blockdev --getsz /dev/vdb1
33552384
$ sudo blockdev --getsz /dev/vdb1
33552384
Create the dm-dust device:
(For a device with a block size of 512 bytes)
$ sudo dmsetup create dust1 --table '0 33552384 dust /dev/vdb1 0 512'
::
$ sudo dmsetup create dust1 --table '0 33552384 dust /dev/vdb1 0 512'
(For a device with a block size of 4096 bytes)
$ sudo dmsetup create dust1 --table '0 33552384 dust /dev/vdb1 0 4096'
::
$ sudo dmsetup create dust1 --table '0 33552384 dust /dev/vdb1 0 4096'
Check the status of the read behavior ("bypass" indicates that all I/O
will be passed through to the underlying device):
$ sudo dmsetup status dust1
0 33552384 dust 252:17 bypass
will be passed through to the underlying device)::
$ sudo dd if=/dev/mapper/dust1 of=/dev/null bs=512 count=128 iflag=direct
128+0 records in
128+0 records out
$ sudo dmsetup status dust1
0 33552384 dust 252:17 bypass
$ sudo dd if=/dev/zero of=/dev/mapper/dust1 bs=512 count=128 oflag=direct
128+0 records in
128+0 records out
$ sudo dd if=/dev/mapper/dust1 of=/dev/null bs=512 count=128 iflag=direct
128+0 records in
128+0 records out
Adding and removing bad blocks:
-------------------------------
$ sudo dd if=/dev/zero of=/dev/mapper/dust1 bs=512 count=128 oflag=direct
128+0 records in
128+0 records out
Adding and removing bad blocks
------------------------------
At any time (i.e.: whether the device has the "bad block" emulation
enabled or disabled), bad blocks may be added or removed from the
device via the "addbadblock" and "removebadblock" messages:
device via the "addbadblock" and "removebadblock" messages::
$ sudo dmsetup message dust1 0 addbadblock 60
kernel: device-mapper: dust: badblock added at block 60
$ sudo dmsetup message dust1 0 addbadblock 60
kernel: device-mapper: dust: badblock added at block 60
$ sudo dmsetup message dust1 0 addbadblock 67
kernel: device-mapper: dust: badblock added at block 67
$ sudo dmsetup message dust1 0 addbadblock 67
kernel: device-mapper: dust: badblock added at block 67
$ sudo dmsetup message dust1 0 addbadblock 72
kernel: device-mapper: dust: badblock added at block 72
$ sudo dmsetup message dust1 0 addbadblock 72
kernel: device-mapper: dust: badblock added at block 72
These bad blocks will be stored in the "bad block list".
While the device is in "bypass" mode, reads and writes will succeed:
While the device is in "bypass" mode, reads and writes will succeed::
$ sudo dmsetup status dust1
0 33552384 dust 252:17 bypass
$ sudo dmsetup status dust1
0 33552384 dust 252:17 bypass
Enabling block read failures:
-----------------------------
Enabling block read failures
----------------------------
To enable the "fail read on bad block" behavior, send the "enable" message:
To enable the "fail read on bad block" behavior, send the "enable" message::
$ sudo dmsetup message dust1 0 enable
kernel: device-mapper: dust: enabling read failures on bad sectors
$ sudo dmsetup message dust1 0 enable
kernel: device-mapper: dust: enabling read failures on bad sectors
$ sudo dmsetup status dust1
0 33552384 dust 252:17 fail_read_on_bad_block
$ sudo dmsetup status dust1
0 33552384 dust 252:17 fail_read_on_bad_block
With the device in "fail read on bad block" mode, attempting to read a
block will encounter an "Input/output error":
block will encounter an "Input/output error"::
$ sudo dd if=/dev/mapper/dust1 of=/dev/null bs=512 count=1 skip=67 iflag=direct
dd: error reading '/dev/mapper/dust1': Input/output error
0+0 records in
0+0 records out
0 bytes copied, 0.00040651 s, 0.0 kB/s
$ sudo dd if=/dev/mapper/dust1 of=/dev/null bs=512 count=1 skip=67 iflag=direct
dd: error reading '/dev/mapper/dust1': Input/output error
0+0 records in
0+0 records out
0 bytes copied, 0.00040651 s, 0.0 kB/s
...and writing to the bad blocks will remove the blocks from the list,
therefore emulating the "remap" behavior of hard disk drives:
therefore emulating the "remap" behavior of hard disk drives::
$ sudo dd if=/dev/zero of=/dev/mapper/dust1 bs=512 count=128 oflag=direct
128+0 records in
128+0 records out
$ sudo dd if=/dev/zero of=/dev/mapper/dust1 bs=512 count=128 oflag=direct
128+0 records in
128+0 records out
kernel: device-mapper: dust: block 60 removed from badblocklist by write
kernel: device-mapper: dust: block 67 removed from badblocklist by write
kernel: device-mapper: dust: block 72 removed from badblocklist by write
kernel: device-mapper: dust: block 87 removed from badblocklist by write
kernel: device-mapper: dust: block 60 removed from badblocklist by write
kernel: device-mapper: dust: block 67 removed from badblocklist by write
kernel: device-mapper: dust: block 72 removed from badblocklist by write
kernel: device-mapper: dust: block 87 removed from badblocklist by write
Bad block add/remove error handling:
------------------------------------
Bad block add/remove error handling
-----------------------------------
Attempting to add a bad block that already exists in the list will
result in an "Invalid argument" error, as well as a helpful message:
result in an "Invalid argument" error, as well as a helpful message::
$ sudo dmsetup message dust1 0 addbadblock 88
device-mapper: message ioctl on dust1 failed: Invalid argument
kernel: device-mapper: dust: block 88 already in badblocklist
$ sudo dmsetup message dust1 0 addbadblock 88
device-mapper: message ioctl on dust1 failed: Invalid argument
kernel: device-mapper: dust: block 88 already in badblocklist
Attempting to remove a bad block that doesn't exist in the list will
result in an "Invalid argument" error, as well as a helpful message:
result in an "Invalid argument" error, as well as a helpful message::
$ sudo dmsetup message dust1 0 removebadblock 87
device-mapper: message ioctl on dust1 failed: Invalid argument
kernel: device-mapper: dust: block 87 not found in badblocklist
$ sudo dmsetup message dust1 0 removebadblock 87
device-mapper: message ioctl on dust1 failed: Invalid argument
kernel: device-mapper: dust: block 87 not found in badblocklist
Counting the number of bad blocks in the bad block list:
--------------------------------------------------------
Counting the number of bad blocks in the bad block list
-------------------------------------------------------
To count the number of bad blocks configured in the device, run the
following message command:
following message command::
$ sudo dmsetup message dust1 0 countbadblocks
$ sudo dmsetup message dust1 0 countbadblocks
A message will print with the number of bad blocks currently
configured on the device:
configured on the device::
kernel: device-mapper: dust: countbadblocks: 895 badblock(s) found
kernel: device-mapper: dust: countbadblocks: 895 badblock(s) found
Querying for specific bad blocks:
---------------------------------
Querying for specific bad blocks
--------------------------------
To find out if a specific block is in the bad block list, run the
following message command:
following message command::
$ sudo dmsetup message dust1 0 queryblock 72
$ sudo dmsetup message dust1 0 queryblock 72
The following message will print if the block is in the list:
device-mapper: dust: queryblock: block 72 found in badblocklist
The following message will print if the block is in the list::
The following message will print if the block is in the list:
device-mapper: dust: queryblock: block 72 not found in badblocklist
device-mapper: dust: queryblock: block 72 found in badblocklist
The following message will print if the block is not in the list::
device-mapper: dust: queryblock: block 72 not found in badblocklist
The "queryblock" message command will work in both the "enabled"
and "disabled" modes, allowing the verification of whether a block
will be treated as "bad" without having to issue I/O to the device,
or having to "enable" the bad block emulation.
Clearing the bad block list:
----------------------------
Clearing the bad block list
---------------------------
To clear the bad block list (without needing to individually run
a "removebadblock" message command for every block), run the
following message command:
following message command::
$ sudo dmsetup message dust1 0 clearbadblocks
$ sudo dmsetup message dust1 0 clearbadblocks
After clearing the bad block list, the following message will appear:
After clearing the bad block list, the following message will appear::
kernel: device-mapper: dust: clearbadblocks: badblocks cleared
kernel: device-mapper: dust: clearbadblocks: badblocks cleared
If there were no bad blocks to clear, the following message will
appear:
appear::
kernel: device-mapper: dust: clearbadblocks: no badblocks found
kernel: device-mapper: dust: clearbadblocks: no badblocks found
Message commands list:
----------------------
Message commands list
---------------------
Below is a list of the messages that can be sent to a dust device:
Operations on blocks (requires a <blknum> argument):
Operations on blocks (requires a <blknum> argument)::
addbadblock <blknum>
queryblock <blknum>
removebadblock <blknum>
addbadblock <blknum>
queryblock <blknum>
removebadblock <blknum>
...where <blknum> is a block number within range of the device
(corresponding to the block size of the device.)
(corresponding to the block size of the device.)
Single argument message commands:
Single argument message commands::
countbadblocks
clearbadblocks
disable
enable
quiet
countbadblocks
clearbadblocks
disable
enable
quiet
Device removal:
---------------
Device removal
--------------
When finished, remove the device via the "dmsetup remove" command:
When finished, remove the device via the "dmsetup remove" command::
$ sudo dmsetup remove dust1
$ sudo dmsetup remove dust1
Quiet mode:
-----------
Quiet mode
----------
On test runs with many bad blocks, it may be desirable to avoid
excessive logging (from bad blocks added, removed, or "remapped").
This can be done by enabling "quiet mode" via the following message:
This can be done by enabling "quiet mode" via the following message::
$ sudo dmsetup message dust1 0 quiet
$ sudo dmsetup message dust1 0 quiet
This will suppress log messages from add / remove / removed by write
operations. Log messages from "countbadblocks" or "queryblock"
message commands will still print in quiet mode.
The status of quiet mode can be seen by running "dmsetup status":
The status of quiet mode can be seen by running "dmsetup status"::
$ sudo dmsetup status dust1
0 33552384 dust 252:17 fail_read_on_bad_block quiet
$ sudo dmsetup status dust1
0 33552384 dust 252:17 fail_read_on_bad_block quiet
To disable quiet mode, send the "quiet" message again:
To disable quiet mode, send the "quiet" message again::
$ sudo dmsetup message dust1 0 quiet
$ sudo dmsetup message dust1 0 quiet
$ sudo dmsetup status dust1
0 33552384 dust 252:17 fail_read_on_bad_block verbose
$ sudo dmsetup status dust1
0 33552384 dust 252:17 fail_read_on_bad_block verbose
(The presence of "verbose" indicates normal logging.)

1
Documentation/admin-guide/device-mapper/index.rst
View File

@ -9,6 +9,7 @@ Device Mapper
cache
delay
dm-crypt
dm-dust
dm-flakey
dm-init
dm-integrity

65
Documentation/admin-guide/index.rst
View File

@ -57,60 +57,61 @@ configure specific aspects of kernel behavior to your liking.
.. toctree::
:maxdepth: 1
initrd
cgroup-v2
cgroup-v1/index
serial-console
braille-console
parport
md
module-signing
rapidio
sysrq
unicode
vga-softcursor
binfmt-misc
mono
java
ras
bcache
blockdev/index
ext4
binderfs
cifs/index
xfs
jfs
ufs
pm/index
thunderbolt
LSM/index
mm/index
namespaces/index
perf-security
acpi/index
aoe/index
auxdisplay/index
bcache
binderfs
binfmt-misc
blockdev/index
braille-console
btmrvl
cgroup-v1/index
cgroup-v2
cifs/index
clearing-warn-once
cpu-load
cputopology
dell_rbu
device-mapper/index
efi-stub
ext4
gpio/index
highuid
hw_random
initrd
iostats
java
jfs
kernel-per-CPU-kthreads
laptops/index
auxdisplay/index
lcd-panel-cgram
ldm
lockup-watchdogs
LSM/index
md
mm/index
module-signing
mono
namespaces/index
numastat
parport
perf-security
pm/index
pnp
rapidio
ras
rtc
serial-console
svga
wimax/index
sysrq
thunderbolt
ufs
unicode
vga-softcursor
video-output
wimax/index
xfs
.. only:: subproject and html

47
Documentation/admin-guide/iostats.rst
View File

@ -46,78 +46,79 @@ each snapshot of your disk statistics.
In 2.4, the statistics fields are those after the device name. In
the above example, the first field of statistics would be 446216.
By contrast, in 2.6+ if you look at ``/sys/block/hda/stat``, you'll
find just the eleven fields, beginning with 446216. If you look at
``/proc/diskstats``, the eleven fields will be preceded by the major and
find just the 15 fields, beginning with 446216. If you look at
``/proc/diskstats``, the 15 fields will be preceded by the major and
minor device numbers, and device name. Each of these formats provides
eleven fields of statistics, each meaning exactly the same things.
15 fields of statistics, each meaning exactly the same things.
All fields except field 9 are cumulative since boot. Field 9 should
go to zero as I/Os complete; all others only increase (unless they
overflow and wrap). Yes, these are (32-bit or 64-bit) unsigned long
(native word size) numbers, and on a very busy or long-lived system they
may wrap. Applications should be prepared to deal with that; unless
your observations are measured in large numbers of minutes or hours,
they should not wrap twice before you notice them.
overflow and wrap). Wrapping might eventually occur on a very busy
or long-lived system; so applications should be prepared to deal with
it. Regarding wrapping, the types of the fields are either unsigned
int (32 bit) or unsigned long (32-bit or 64-bit, depending on your
machine) as noted per-field below. Unless your observations are very
spread in time, these fields should not wrap twice before you notice it.
Each set of stats only applies to the indicated device; if you want
system-wide stats you'll have to find all the devices and sum them all up.
Field 1 -- # of reads completed
Field 1 -- # of reads completed (unsigned long)
This is the total number of reads completed successfully.
Field 2 -- # of reads merged, field 6 -- # of writes merged
Field 2 -- # of reads merged, field 6 -- # of writes merged (unsigned long)
Reads and writes which are adjacent to each other may be merged for
efficiency. Thus two 4K reads may become one 8K read before it is
ultimately handed to the disk, and so it will be counted (and queued)
as only one I/O. This field lets you know how often this was done.
Field 3 -- # of sectors read
Field 3 -- # of sectors read (unsigned long)
This is the total number of sectors read successfully.
Field 4 -- # of milliseconds spent reading
Field 4 -- # of milliseconds spent reading (unsigned int)
This is the total number of milliseconds spent by all reads (as
measured from __make_request() to end_that_request_last()).
Field 5 -- # of writes completed
Field 5 -- # of writes completed (unsigned long)
This is the total number of writes completed successfully.
Field 6 -- # of writes merged
Field 6 -- # of writes merged (unsigned long)
See the description of field 2.
Field 7 -- # of sectors written
Field 7 -- # of sectors written (unsigned long)
This is the total number of sectors written successfully.
Field 8 -- # of milliseconds spent writing
Field 8 -- # of milliseconds spent writing (unsigned int)
This is the total number of milliseconds spent by all writes (as
measured from __make_request() to end_that_request_last()).
Field 9 -- # of I/Os currently in progress
Field 9 -- # of I/Os currently in progress (unsigned int)
The only field that should go to zero. Incremented as requests are
given to appropriate struct request_queue and decremented as they finish.
Field 10 -- # of milliseconds spent doing I/Os
Field 10 -- # of milliseconds spent doing I/Os (unsigned int)
This field increases so long as field 9 is nonzero.
Since 5.0 this field counts jiffies when at least one request was
started or completed. If request runs more than 2 jiffies then some
I/O time will not be accounted unless there are other requests.
Field 11 -- weighted # of milliseconds spent doing I/Os
Field 11 -- weighted # of milliseconds spent doing I/Os (unsigned int)
This field is incremented at each I/O start, I/O completion, I/O
merge, or read of these stats by the number of I/Os in progress
(field 9) times the number of milliseconds spent doing I/O since the
last update of this field. This can provide an easy measure of both
I/O completion time and the backlog that may be accumulating.
Field 12 -- # of discards completed
Field 12 -- # of discards completed (unsigned long)
This is the total number of discards completed successfully.
Field 13 -- # of discards merged
Field 13 -- # of discards merged (unsigned long)
See the description of field 2
Field 14 -- # of sectors discarded
Field 14 -- # of sectors discarded (unsigned long)
This is the total number of sectors discarded successfully.
Field 15 -- # of milliseconds spent discarding
Field 15 -- # of milliseconds spent discarding (unsigned int)
This is the total number of milliseconds spent by all discards (as
measured from __make_request() to end_that_request_last()).

12
Documentation/admin-guide/kernel-parameters.txt
View File

@ -437,8 +437,6 @@
no delay (0).
Format: integer
bootmem_debug [KNL] Enable bootmem allocator debug messages.
bert_disable [ACPI]
Disable BERT OS support on buggy BIOSes.
@ -983,12 +981,10 @@
earlycon= [KNL] Output early console device and options.
[ARM64] The early console is determined by the
stdout-path property in device tree's chosen node,
or determined by the ACPI SPCR table.
[X86] When used with no options the early console is
determined by the ACPI SPCR table.
When used with no options, the early console is
determined by stdout-path property in device tree's
chosen node or the ACPI SPCR table if supported by
the platform.
cdns,<addr>[,options]
Start an early, polled-mode console on a Cadence

31
Documentation/admin-guide/perf/imx-ddr.rst
View File

@ -19,7 +19,9 @@ devices/imx8_ddr0/format/. The "events" directory describes the events types
hardware supported that can be used with perf tool, see /sys/bus/event_source/
devices/imx8_ddr0/events/. The "caps" directory describes filter features implemented
in DDR PMU, see /sys/bus/events_source/devices/imx8_ddr0/caps/.
e.g.::
.. code-block:: bash
perf stat -a -e imx8_ddr0/cycles/ cmd
perf stat -a -e imx8_ddr0/read/,imx8_ddr0/write/ cmd
@ -35,24 +37,31 @@ value 1 for supported.
Filter is defined with two configuration parts:
--AXI_ID defines AxID matching value.
--AXI_MASKING defines which bits of AxID are meaningful for the matching.
0：corresponding bit is masked.
1: corresponding bit is not masked, i.e. used to do the matching.
- 0: corresponding bit is masked.
- 1: corresponding bit is not masked, i.e. used to do the matching.
AXI_ID and AXI_MASKING are mapped on DPCR1 register in performance counter.
When non-masked bits are matching corresponding AXI_ID bits then counter is
incremented. Perf counter is incremented if
AxID && AXI_MASKING == AXI_ID && AXI_MASKING
AxID && AXI_MASKING == AXI_ID && AXI_MASKING
This filter doesn't support filter different AXI ID for axid-read and axid-write
event at the same time as this filter is shared between counters.
e.g.::
perf stat -a -e imx8_ddr0/axid-read,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
perf stat -a -e imx8_ddr0/axid-write,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
NOTE: axi_mask is inverted in userspace(i.e. set bits are bits to mask), and
it will be reverted in driver automatically. so that the user can just specify
axi_id to monitor a specific id, rather than having to specify axi_mask.
e.g.::
.. code-block:: bash
perf stat -a -e imx8_ddr0/axid-read,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
perf stat -a -e imx8_ddr0/axid-write,axi_mask=0xMMMM,axi_id=0xDDDD/ cmd
.. note::
axi_mask is inverted in userspace(i.e. set bits are bits to mask), and
it will be reverted in driver automatically. so that the user can just specify
axi_id to monitor a specific id, rather than having to specify axi_mask.
.. code-block:: bash
perf stat -a -e imx8_ddr0/axid-read,axi_id=0x12/ cmd, which will monitor ARID=0x12
* With DDR_CAP_AXI_ID_FILTER_ENHANCED quirk(filter: 1, enhanced_filter: 1).

1
Documentation/admin-guide/perf/index.rst
View File

@ -8,6 +8,7 @@ Performance monitor support
:maxdepth: 1
hisi-pmu
imx-ddr
qcom_l2_pmu
qcom_l3_pmu
arm-ccn

12
Documentation/admin-guide/sysctl/kernel.rst
View File

@ -831,8 +831,8 @@ printk_ratelimit:
=================
Some warning messages are rate limited. printk_ratelimit specifies
the minimum length of time between these messages (in jiffies), by
default we allow one every 5 seconds.
the minimum length of time between these messages (in seconds).
The default value is 5 seconds.
A value of 0 will disable rate limiting.
@ -845,6 +845,8 @@ seconds, we do allow a burst of messages to pass through.
printk_ratelimit_burst specifies the number of messages we can
send before ratelimiting kicks in.
The default value is 10 messages.
printk_devkmsg:
===============
@ -1101,7 +1103,7 @@ During initialization the kernel sets this value such that even if the
maximum number of threads is created, the thread structures occupy only
a part (1/8th) of the available RAM pages.
The minimum value that can be written to threads-max is 20.
The minimum value that can be written to threads-max is 1.
The maximum value that can be written to threads-max is given by the
constant FUTEX_TID_MASK (0x3fffffff).
@ -1109,10 +1111,6 @@ constant FUTEX_TID_MASK (0x3fffffff).
If a value outside of this range is written to threads-max an error
EINVAL occurs.
The value written is checked against the available RAM pages. If the
thread structures would occupy too much (more than 1/8th) of the
available RAM pages threads-max is reduced accordingly.
unknown_nmi_panic:
==================

3
Documentation/conf.py
View File

@ -37,7 +37,8 @@ needs_sphinx = '1.3'
# extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
# ones.
extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include', 'cdomain',
'kfigure', 'sphinx.ext.ifconfig', 'automarkup']
'kfigure', 'sphinx.ext.ifconfig', 'automarkup',
'maintainers_include']
# The name of the math extension changed on Sphinx 1.4
if (major == 1 and minor > 3) or (major > 1):

26
Documentation/core-api/genalloc.rst
View File

@ -23,7 +23,7 @@ begins with the creation of a pool using one of:
.. kernel-doc:: lib/genalloc.c
:functions: devm_gen_pool_create
A call to :c:func:`gen_pool_create` will create a pool. The granularity of
A call to gen_pool_create() will create a pool. The granularity of
allocations is set with min_alloc_order; it is a log-base-2 number like
those used by the page allocator, but it refers to bytes rather than pages.
So, if min_alloc_order is passed as 3, then all allocations will be a
@ -32,7 +32,7 @@ required to track the memory in the pool. The nid parameter specifies
which NUMA node should be used for the allocation of the housekeeping
structures; it can be -1 if the caller doesn't care.
The "managed" interface :c:func:`devm_gen_pool_create` ties the pool to a
The "managed" interface devm_gen_pool_create() ties the pool to a
specific device. Among other things, it will automatically clean up the
pool when the given device is destroyed.
@ -53,32 +53,32 @@ to the pool. That can be done with one of:
:functions: gen_pool_add
.. kernel-doc:: lib/genalloc.c
:functions: gen_pool_add_virt
:functions: gen_pool_add_owner
A call to :c:func:`gen_pool_add` will place the size bytes of memory
A call to gen_pool_add() will place the size bytes of memory
starting at addr (in the kernel's virtual address space) into the given
pool, once again using nid as the node ID for ancillary memory allocations.
The :c:func:`gen_pool_add_virt` variant associates an explicit physical
The gen_pool_add_virt() variant associates an explicit physical
address with the memory; this is only necessary if the pool will be used
for DMA allocations.
The functions for allocating memory from the pool (and putting it back)
are:
.. kernel-doc:: lib/genalloc.c
.. kernel-doc:: include/linux/genalloc.h
:functions: gen_pool_alloc
.. kernel-doc:: lib/genalloc.c
:functions: gen_pool_dma_alloc
.. kernel-doc:: lib/genalloc.c
:functions: gen_pool_free
:functions: gen_pool_free_owner
As one would expect, :c:func:`gen_pool_alloc` will allocate size< bytes
from the given pool. The :c:func:`gen_pool_dma_alloc` variant allocates
As one would expect, gen_pool_alloc() will allocate size< bytes
from the given pool. The gen_pool_dma_alloc() variant allocates
memory for use with DMA operations, returning the associated physical
address in the space pointed to by dma. This will only work if the memory
was added with :c:func:`gen_pool_add_virt`. Note that this function
was added with gen_pool_add_virt(). Note that this function
departs from the usual genpool pattern of using unsigned long values to
represent kernel addresses; it returns a void * instead.
@ -89,14 +89,14 @@ return. If that sort of control is needed, the following functions will be
of interest:
.. kernel-doc:: lib/genalloc.c
:functions: gen_pool_alloc_algo
:functions: gen_pool_alloc_algo_owner
.. kernel-doc:: lib/genalloc.c
:functions: gen_pool_set_algo
Allocations with :c:func:`gen_pool_alloc_algo` specify an algorithm to be
Allocations with gen_pool_alloc_algo() specify an algorithm to be
used to choose the memory to be allocated; the default algorithm can be set
with :c:func:`gen_pool_set_algo`. The data value is passed to the
with gen_pool_set_algo(). The data value is passed to the
algorithm; most ignore it, but it is occasionally needed. One can,
naturally, write a special-purpose algorithm, but there is a fair set
already available:

52
Documentation/core-api/genericirq.rst
View File

@ -26,7 +26,7 @@ Rationale
=========
The original implementation of interrupt handling in Linux uses the
:c:func:`__do_IRQ` super-handler, which is able to deal with every type of
__do_IRQ() super-handler, which is able to deal with every type of
interrupt logic.
Originally, Russell King identified different types of handlers to build
@ -43,7 +43,7 @@ During the implementation we identified another type:
- Fast EOI type
In the SMP world of the :c:func:`__do_IRQ` super-handler another type was
In the SMP world of the __do_IRQ() super-handler another type was
identified:
- Per CPU type
@ -83,7 +83,7 @@ IRQ-flow implementation for 'level type' interrupts and add a
(sub)architecture specific 'edge type' implementation.
To make the transition to the new model easier and prevent the breakage
of existing implementations, the :c:func:`__do_IRQ` super-handler is still
of existing implementations, the __do_IRQ() super-handler is still
available. This leads to a kind of duality for the time being. Over time
the new model should be used in more and more architectures, as it
enables smaller and cleaner IRQ subsystems. It's deprecated for three
@ -116,7 +116,7 @@ status information and pointers to the interrupt flow method and the
interrupt chip structure which are assigned to this interrupt.
Whenever an interrupt triggers, the low-level architecture code calls
into the generic interrupt code by calling :c:func:`desc->handle_irq`. This
into the generic interrupt code by calling desc->handle_irq(). This
high-level IRQ handling function only uses desc->irq_data.chip
primitives referenced by the assigned chip descriptor structure.
@ -125,27 +125,29 @@ High-level Driver API
The high-level Driver API consists of following functions:
- :c:func:`request_irq`
- request_irq()
- :c:func:`free_irq`
- request_threaded_irq()
- :c:func:`disable_irq`
- free_irq()
- :c:func:`enable_irq`
- disable_irq()
- :c:func:`disable_irq_nosync` (SMP only)
- enable_irq()
- :c:func:`synchronize_irq` (SMP only)
- disable_irq_nosync() (SMP only)
- :c:func:`irq_set_irq_type`
- synchronize_irq() (SMP only)
- :c:func:`irq_set_irq_wake`
- irq_set_irq_type()
- :c:func:`irq_set_handler_data`
- irq_set_irq_wake()
- :c:func:`irq_set_chip`
- irq_set_handler_data()
- :c:func:`irq_set_chip_data`
- irq_set_chip()
- irq_set_chip_data()
See the autogenerated function documentation for details.
@ -154,19 +156,19 @@ High-level IRQ flow handlers
The generic layer provides a set of pre-defined irq-flow methods:
- :c:func:`handle_level_irq`
- handle_level_irq()
- :c:func:`handle_edge_irq`
- handle_edge_irq()
- :c:func:`handle_fasteoi_irq`
- handle_fasteoi_irq()
- :c:func:`handle_simple_irq`
- handle_simple_irq()
- :c:func:`handle_percpu_irq`
- handle_percpu_irq()
- :c:func:`handle_edge_eoi_irq`
- handle_edge_eoi_irq()
- :c:func:`handle_bad_irq`
- handle_bad_irq()
The interrupt flow handlers (either pre-defined or architecture
specific) are assigned to specific interrupts by the architecture either
@ -325,14 +327,14 @@ Delayed interrupt disable
This per interrupt selectable feature, which was introduced by Russell
King in the ARM interrupt implementation, does not mask an interrupt at
the hardware level when :c:func:`disable_irq` is called. The interrupt is kept
the hardware level when disable_irq() is called. The interrupt is kept
enabled and is masked in the flow handler when an interrupt event
happens. This prevents losing edge interrupts on hardware which does not
store an edge interrupt event while the interrupt is disabled at the
hardware level. When an interrupt arrives while the IRQ_DISABLED flag
is set, then the interrupt is masked at the hardware level and the
IRQ_PENDING bit is set. When the interrupt is re-enabled by
:c:func:`enable_irq` the pending bit is checked and if it is set, the interrupt
enable_irq() the pending bit is checked and if it is set, the interrupt
is resent either via hardware or by a software resend mechanism. (It's
necessary to enable CONFIG_HARDIRQS_SW_RESEND when you want to use
the delayed interrupt disable feature and your hardware is not capable
@ -369,7 +371,7 @@ handler(s) to use these basic units of low-level functionality.
__do_IRQ entry point
====================
The original implementation :c:func:`__do_IRQ` was an alternative entry point
The original implementation __do_IRQ() was an alternative entry point
for all types of interrupts. It no longer exists.
This handler turned out to be not suitable for all interrupt hardware

48
Documentation/core-api/memory-allocation.rst
View File

@ -88,10 +88,11 @@ Selecting memory allocator
==========================
The most straightforward way to allocate memory is to use a function
from the :c:func:`kmalloc` family. And, to be on the safe size it's
best to use routines that set memory to zero, like
:c:func:`kzalloc`. If you need to allocate memory for an array, there
are :c:func:`kmalloc_array` and :c:func:`kcalloc` helpers.
from the kmalloc() family. And, to be on the safe side it's best to use
routines that set memory to zero, like kzalloc(). If you need to
allocate memory for an array, there are kmalloc_array() and kcalloc()
helpers. The helpers struct_size(), array_size() and array3_size() can
be used to safely calculate object sizes without overflowing.
The maximal size of a chunk that can be allocated with `kmalloc` is
limited. The actual limit depends on the hardware and the kernel
@ -102,29 +103,26 @@ The address of a chunk allocated with `kmalloc` is aligned to at least
ARCH_KMALLOC_MINALIGN bytes. For sizes which are a power of two, the
alignment is also guaranteed to be at least the respective size.
For large allocations you can use :c:func:`vmalloc` and
:c:func:`vzalloc`, or directly request pages from the page
allocator. The memory allocated by `vmalloc` and related functions is
not physically contiguous.
For large allocations you can use vmalloc() and vzalloc(), or directly
request pages from the page allocator. The memory allocated by `vmalloc`
and related functions is not physically contiguous.
If you are not sure whether the allocation size is too large for
`kmalloc`, it is possible to use :c:func:`kvmalloc` and its
derivatives. It will try to allocate memory with `kmalloc` and if the
allocation fails it will be retried with `vmalloc`. There are
restrictions on which GFP flags can be used with `kvmalloc`; please
see :c:func:`kvmalloc_node` reference documentation. Note that
`kvmalloc` may return memory that is not physically contiguous.
`kmalloc`, it is possible to use kvmalloc() and its derivatives. It will
try to allocate memory with `kmalloc` and if the allocation fails it
will be retried with `vmalloc`. There are restrictions on which GFP
flags can be used with `kvmalloc`; please see kvmalloc_node() reference
documentation. Note that `kvmalloc` may return memory that is not
physically contiguous.
If you need to allocate many identical objects you can use the slab
cache allocator. The cache should be set up with
:c:func:`kmem_cache_create` or :c:func:`kmem_cache_create_usercopy`
before it can be used. The second function should be used if a part of
the cache might be copied to the userspace. After the cache is
created :c:func:`kmem_cache_alloc` and its convenience wrappers can
allocate memory from that cache.
cache allocator. The cache should be set up with kmem_cache_create() or
kmem_cache_create_usercopy() before it can be used. The second function
should be used if a part of the cache might be copied to the userspace.
After the cache is created kmem_cache_alloc() and its convenience
wrappers can allocate memory from that cache.
When the allocated memory is no longer needed it must be freed. You
can use :c:func:`kvfree` for the memory allocated with `kmalloc`,
`vmalloc` and `kvmalloc`. The slab caches should be freed with
:c:func:`kmem_cache_free`. And don't forget to destroy the cache with
:c:func:`kmem_cache_destroy`.
When the allocated memory is no longer needed it must be freed. You can
use kvfree() for the memory allocated with `kmalloc`, `vmalloc` and
`kvmalloc`. The slab caches should be freed with kmem_cache_free(). And
don't forget to destroy the cache with kmem_cache_destroy().

2
Documentation/core-api/mm-api.rst
View File

@ -11,7 +11,7 @@ User Space Memory Access
.. kernel-doc:: arch/x86/lib/usercopy_32.c
:export:
.. kernel-doc:: mm/util.c
.. kernel-doc:: mm/gup.c
:functions: get_user_pages_fast
.. _mm-api-gfp-flags:

14
Documentation/core-api/printk-formats.rst
View File

@ -137,6 +137,20 @@ equivalent to %lx (or %lu). %px is preferred because it is more uniquely
grep'able. If in the future we need to modify the way the kernel handles
printing pointers we will be better equipped to find the call sites.
Pointer Differences
-------------------
::
%td 2560
%tx a00
For printing the pointer differences, use the %t modifier for ptrdiff_t.
Example::
printk("test: difference between pointers: %td\n", ptr2 - ptr1);
Struct Resources
----------------

36
Documentation/core-api/refcount-vs-atomic.rst
View File

@ -35,7 +35,7 @@ atomics & refcounters only provide atomicity and
program order (po) relation (on the same CPU). It guarantees that
each ``atomic_*()`` and ``refcount_*()`` operation is atomic and instructions
are executed in program order on a single CPU.
This is implemented using :c:func:`READ_ONCE`/:c:func:`WRITE_ONCE` and
This is implemented using READ_ONCE()/WRITE_ONCE() and
compare-and-swap primitives.
A strong (full) memory ordering guarantees that all prior loads and
@ -44,7 +44,7 @@ before any po-later instruction is executed on the same CPU.
It also guarantees that all po-earlier stores on the same CPU
and all propagated stores from other CPUs must propagate to all
other CPUs before any po-later instruction is executed on the original
CPU (A-cumulative property). This is implemented using :c:func:`smp_mb`.
CPU (A-cumulative property). This is implemented using smp_mb().
A RELEASE memory ordering guarantees that all prior loads and
stores (all po-earlier instructions) on the same CPU are completed
@ -52,14 +52,14 @@ before the operation. It also guarantees that all po-earlier
stores on the same CPU and all propagated stores from other CPUs
must propagate to all other CPUs before the release operation
(A-cumulative property). This is implemented using
:c:func:`smp_store_release`.
smp_store_release().
An ACQUIRE memory ordering guarantees that all post loads and
stores (all po-later instructions) on the same CPU are
completed after the acquire operation. It also guarantees that all
po-later stores on the same CPU must propagate to all other CPUs
after the acquire operation executes. This is implemented using
:c:func:`smp_acquire__after_ctrl_dep`.
smp_acquire__after_ctrl_dep().
A control dependency (on success) for refcounters guarantees that
if a reference for an object was successfully obtained (reference
@ -78,8 +78,8 @@ case 1) - non-"Read/Modify/Write" (RMW) ops
Function changes:
* :c:func:`atomic_set` --> :c:func:`refcount_set`
* :c:func:`atomic_read` --> :c:func:`refcount_read`
* atomic_set() --> refcount_set()
* atomic_read() --> refcount_read()
Memory ordering guarantee changes:
@ -91,8 +91,8 @@ case 2) - increment-based ops that return no value
Function changes:
* :c:func:`atomic_inc` --> :c:func:`refcount_inc`
* :c:func:`atomic_add` --> :c:func:`refcount_add`
* atomic_inc() --> refcount_inc()
* atomic_add() --> refcount_add()
Memory ordering guarantee changes:
@ -103,7 +103,7 @@ case 3) - decrement-based RMW ops that return no value
Function changes:
* :c:func:`atomic_dec` --> :c:func:`refcount_dec`
* atomic_dec() --> refcount_dec()
Memory ordering guarantee changes:
@ -115,8 +115,8 @@ case 4) - increment-based RMW ops that return a value
Function changes:
* :c:func:`atomic_inc_not_zero` --> :c:func:`refcount_inc_not_zero`
* no atomic counterpart --> :c:func:`refcount_add_not_zero`
* atomic_inc_not_zero() --> refcount_inc_not_zero()
* no atomic counterpart --> refcount_add_not_zero()
Memory ordering guarantees changes:
@ -131,8 +131,8 @@ case 5) - generic dec/sub decrement-based RMW ops that return a value
Function changes:
* :c:func:`atomic_dec_and_test` --> :c:func:`refcount_dec_and_test`
* :c:func:`atomic_sub_and_test` --> :c:func:`refcount_sub_and_test`
* atomic_dec_and_test() --> refcount_dec_and_test()
* atomic_sub_and_test() --> refcount_sub_and_test()
Memory ordering guarantees changes:
@ -144,14 +144,14 @@ case 6) other decrement-based RMW ops that return a value
Function changes:
* no atomic counterpart --> :c:func:`refcount_dec_if_one`
* no atomic counterpart --> refcount_dec_if_one()
* ``atomic_add_unless(&var, -1, 1)`` --> ``refcount_dec_not_one(&var)``
Memory ordering guarantees changes:
* fully ordered --> RELEASE ordering + control dependency
.. note:: :c:func:`atomic_add_unless` only provides full order on success.
.. note:: atomic_add_unless() only provides full order on success.
case 7) - lock-based RMW
@ -159,10 +159,10 @@ case 7) - lock-based RMW
Function changes:
* :c:func:`atomic_dec_and_lock` --> :c:func:`refcount_dec_and_lock`
* :c:func:`atomic_dec_and_mutex_lock` --> :c:func:`refcount_dec_and_mutex_lock`
* atomic_dec_and_lock() --> refcount_dec_and_lock()
* atomic_dec_and_mutex_lock() --> refcount_dec_and_mutex_lock()
Memory ordering guarantees changes:
* fully ordered --> RELEASE ordering + control dependency + hold
:c:func:`spin_lock` on success
spin_lock() on success

2
Documentation/dev-tools/kmemleak.rst
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@ -69,7 +69,7 @@ the kernel command line.
Memory may be allocated or freed before kmemleak is initialised and
these actions are stored in an early log buffer. The size of this buffer
is configured via the CONFIG_DEBUG_KMEMLEAK_EARLY_LOG_SIZE option.
is configured via the CONFIG_DEBUG_KMEMLEAK_MEM_POOL_SIZE option.
If CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF are enabled, the kmemleak is
disabled by default. Passing ``kmemleak=on`` on the kernel command

2
Documentation/devicetree/bindings/cpu/cpu-topology.txt
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@ -549,5 +549,5 @@ Example 3: HiFive Unleashed (RISC-V 64 bit, 4 core system)
[2] Devicetree NUMA binding description
Documentation/devicetree/bindings/numa.txt
[3] RISC-V Linux kernel documentation
Documentation/devicetree/bindings/riscv/cpus.txt
Documentation/devicetree/bindings/riscv/cpus.yaml
[4] https://www.devicetree.org/specifications/

2
Documentation/devicetree/bindings/timer/ingenic,tcu.txt
View File

@ -2,7 +2,7 @@ Ingenic JZ47xx SoCs Timer/Counter Unit devicetree bindings
==========================================================
For a description of the TCU hardware and drivers, have a look at
Documentation/mips/ingenic-tcu.txt.
Documentation/mips/ingenic-tcu.rst.
Required properties:

29
Documentation/doc-guide/kernel-doc.rst
View File

@ -476,6 +476,22 @@ internal: *[source-pattern ...]*
.. kernel-doc:: drivers/gpu/drm/i915/intel_audio.c
:internal:
identifiers: *[ function/type ...]*
Include documentation for each *function* and *type* in *source*.
If no *function* is specified, the documentation for all functions
and types in the *source* will be included.
Examples::
.. kernel-doc:: lib/bitmap.c
:identifiers: bitmap_parselist bitmap_parselist_user
.. kernel-doc:: lib/idr.c
:identifiers:
functions: *[ function/type ...]*
This is an alias of the 'identifiers' directive and deprecated.
doc: *title*
Include documentation for the ``DOC:`` paragraph identified by *title* in
*source*. Spaces are allowed in *title*; do not quote the *title*. The *title*
@ -488,19 +504,6 @@ doc: *title*
.. kernel-doc:: drivers/gpu/drm/i915/intel_audio.c
:doc: High Definition Audio over HDMI and Display Port
functions: *[ function ...]*
Include documentation for each *function* in *source*.
If no *function* is specified, the documentation for all functions
and types in the *source* will be included.
Examples::
.. kernel-doc:: lib/bitmap.c
:functions: bitmap_parselist bitmap_parselist_user
.. kernel-doc:: lib/idr.c
:functions:
Without options, the kernel-doc directive includes all documentation comments
from the source file.

30
Documentation/driver-api/devfreq.rst Normal file
View File

@ -0,0 +1,30 @@
.. SPDX-License-Identifier: GPL-2.0
========================
Device Frequency Scaling
========================
Introduction
------------
This framework provides a standard kernel interface for Dynamic Voltage and
Frequency Switching on arbitrary devices.
It exposes controls for adjusting frequency through sysfs files which are
similar to the cpufreq subsystem.
Devices for which current usage can be measured can have their frequency
automatically adjusted by governors.
API
---
Device drivers need to initialize a :c:type:`devfreq_profile` and call the
:c:func:`devfreq_add_device` function to create a :c:type:`devfreq` instance.
.. kernel-doc:: include/linux/devfreq.h
.. kernel-doc:: include/linux/devfreq-event.h
.. kernel-doc:: drivers/devfreq/devfreq.c
:export:
.. kernel-doc:: drivers/devfreq/devfreq-event.c
:export:

2
Documentation/driver-api/gpio/driver.rst
View File

@ -500,7 +500,7 @@ available but we try to move away from this:
gpiochip. It will pass the struct gpio_chip* for the chip to all IRQ
callbacks, so the callbacks need to embed the gpio_chip in its state
container and obtain a pointer to the container using container_of().
(See Documentation/driver-model/design-patterns.txt)
(See Documentation/driver-api/driver-model/design-patterns.rst)
- gpiochip_irqchip_add_nested(): adds a nested cascaded irqchip to a gpiochip,
as discussed above regarding different types of cascaded irqchips. The

3
Documentation/driver-api/index.rst
View File

@ -40,6 +40,7 @@ available subsections can be seen below.
ipmb
i3c/index
interconnect
devfreq
hsi
edac
scsi
@ -73,7 +74,6 @@ available subsections can be seen below.
connector
console
dcdbas
dell_rbu
edid
eisa
ipmb
@ -93,7 +93,6 @@ available subsections can be seen below.
pwm
rfkill
serial/index
sgi-ioc4
sm501
smsc_ece1099
switchtec

3
Documentation/driver-api/infrastructure.rst
View File

@ -49,9 +49,6 @@ Device Drivers Base
Device Drivers DMA Management
-----------------------------
.. kernel-doc:: kernel/dma/coherent.c
:export:
.. kernel-doc:: kernel/dma/mapping.c
:export:

2
Documentation/driver-api/interconnect.rst
View File

@ -1,7 +1,7 @@
.. SPDX-License-Identifier: GPL-2.0
=====================================
GENERIC SYSTEM INTERCONNECT SUBSYSTEM
Generic System Interconnect Subsystem
=====================================
Introduction

4
Documentation/driver-api/pti_intel_mid.rst
View File

@ -49,7 +49,9 @@ but is not just blindly executing as 'root'. Keep in mind
the use of ioctl(,TIOCSETD,) is not specific to the n_tracerouter
and n_tracesink line discpline drivers but is a generic
operation for a program to use a line discpline driver
on a tty port other than the default n_tty::
on a tty port other than the default n_tty:
.. code-block:: c
/////////// To hook up n_tracerouter and n_tracesink /////////

259
Documentation/filesystems/autofs.txt → Documentation/filesystems/autofs.rst
View File

@ -1,12 +1,9 @@
<head>
<style> p { max-width:50em} ol, ul {max-width: 40em}</style>
</head>
=====================
autofs - how it works
=====================
Purpose
-------
=======
The goal of autofs is to provide on-demand mounting and race free
automatic unmounting of various other filesystems. This provides two
@ -28,7 +25,7 @@ key advantages:
first accessed a name.
Context
-------
=======
The "autofs" filesystem module is only one part of an autofs system.
There also needs to be a user-space program which looks up names
@ -43,7 +40,7 @@ filesystem type. Several "autofs" filesystems can be mounted and they
can each be managed separately, or all managed by the same daemon.
Content
-------
=======
An autofs filesystem can contain 3 sorts of objects: directories,
symbolic links and mount traps. Mount traps are directories with
@ -52,9 +49,10 @@ extra properties as described in the next section.
Objects can only be created by the automount daemon: symlinks are
created with a regular `symlink` system call, while directories and
mount traps are created with `mkdir`. The determination of whether a
directory should be a mount trap or not is quite _ad hoc_, largely for
historical reasons, and is determined in part by the
*direct*/*indirect*/*offset* mount options, and the *maxproto* mount option.
directory should be a mount trap is based on a master map. This master
map is consulted by autofs to determine which directories are mount
points. Mount points can be *direct*/*indirect*/*offset*.
On most systems, the default master map is located at */etc/auto.master*.
If neither the *direct* or *offset* mount options are given (so the
mount is considered to be *indirect*), then the root directory is
@ -80,7 +78,7 @@ where in the tree they are (root, top level, or lower), the *maxproto*,
and whether the mount was *indirect* or not.
Mount Traps
---------------
===========
A core element of the implementation of autofs is the Mount Traps
which are provided by the Linux VFS. Any directory provided by a
@ -201,7 +199,7 @@ initiated or is being considered, otherwise it returns 0.
Mountpoint expiry
-----------------
=================
The VFS has a mechanism for automatically expiring unused mounts,
much as it can expire any unused dentry information from the dcache.
@ -301,7 +299,7 @@ completed (together with removing any directories that might have been
necessary), or has been aborted.
Communicating with autofs: detecting the daemon
-----------------------------------------------
===============================================
There are several forms of communication between the automount daemon
and the filesystem. As we have already seen, the daemon can create and
@ -317,33 +315,39 @@ If the daemon ever has to be stopped and restarted a new pgid can be
provided through an ioctl as will be described below.
Communicating with autofs: the event pipe
-----------------------------------------
=========================================
When an autofs filesystem is mounted, the 'write' end of a pipe must
be passed using the 'fd=' mount option. autofs will write
notification messages to this pipe for the daemon to respond to.
For version 5, the format of the message is:
For version 5, the format of the message is::
struct autofs_v5_packet {
int proto_version; /* Protocol version */
int type; /* Type of packet */
autofs_wqt_t wait_queue_token;
__u32 dev;
__u64 ino;
__u32 uid;
__u32 gid;
__u32 pid;
__u32 tgid;
__u32 len;
char name[NAME_MAX+1];
struct autofs_v5_packet {
struct autofs_packet_hdr hdr;
autofs_wqt_t wait_queue_token;
__u32 dev;
__u64 ino;
__u32 uid;
__u32 gid;
__u32 pid;
__u32 tgid;
__u32 len;
char name[NAME_MAX+1];
};
where the type is one of
And the format of the header is::
autofs_ptype_missing_indirect
autofs_ptype_expire_indirect
autofs_ptype_missing_direct
autofs_ptype_expire_direct
struct autofs_packet_hdr {
int proto_version; /* Protocol version */
int type; /* Type of packet */
};
where the type is one of ::
autofs_ptype_missing_indirect
autofs_ptype_expire_indirect
autofs_ptype_missing_direct
autofs_ptype_expire_direct
so messages can indicate that a name is missing (something tried to
access it but it isn't there) or that it has been selected for expiry.
@ -360,7 +364,7 @@ acknowledged using one of the ioctls below with the relevant
`wait_queue_token`.
Communicating with autofs: root directory ioctls
------------------------------------------------
================================================
The root directory of an autofs filesystem will respond to a number of
ioctls. The process issuing the ioctl must have the CAP_SYS_ADMIN
@ -368,58 +372,66 @@ capability, or must be the automount daemon.
The available ioctl commands are:
- **AUTOFS_IOC_READY**: a notification has been handled. The argument
to the ioctl command is the "wait_queue_token" number
corresponding to the notification being acknowledged.
- **AUTOFS_IOC_FAIL**: similar to above, but indicates failure with
the error code `ENOENT`.
- **AUTOFS_IOC_CATATONIC**: Causes the autofs to enter "catatonic"
mode meaning that it stops sending notifications to the daemon.
This mode is also entered if a write to the pipe fails.
- **AUTOFS_IOC_PROTOVER**: This returns the protocol version in use.
- **AUTOFS_IOC_PROTOSUBVER**: Returns the protocol sub-version which
is really a version number for the implementation.
- **AUTOFS_IOC_SETTIMEOUT**: This passes a pointer to an unsigned
long. The value is used to set the timeout for expiry, and
the current timeout value is stored back through the pointer.
- **AUTOFS_IOC_ASKUMOUNT**: Returns, in the pointed-to `int`, 1 if
the filesystem could be unmounted. This is only a hint as
the situation could change at any instant. This call can be
used to avoid a more expensive full unmount attempt.
- **AUTOFS_IOC_EXPIRE**: as described above, this asks if there is
anything suitable to expire. A pointer to a packet:
- **AUTOFS_IOC_READY**:
a notification has been handled. The argument
to the ioctl command is the "wait_queue_token" number
corresponding to the notification being acknowledged.
- **AUTOFS_IOC_FAIL**:
similar to above, but indicates failure with
the error code `ENOENT`.
- **AUTOFS_IOC_CATATONIC**:
Causes the autofs to enter "catatonic"
mode meaning that it stops sending notifications to the daemon.
This mode is also entered if a write to the pipe fails.
- **AUTOFS_IOC_PROTOVER**:
This returns the protocol version in use.
- **AUTOFS_IOC_PROTOSUBVER**:
Returns the protocol sub-version which
is really a version number for the implementation.
- **AUTOFS_IOC_SETTIMEOUT**:
This passes a pointer to an unsigned
long. The value is used to set the timeout for expiry, and
the current timeout value is stored back through the pointer.
- **AUTOFS_IOC_ASKUMOUNT**:
Returns, in the pointed-to `int`, 1 if
the filesystem could be unmounted. This is only a hint as
the situation could change at any instant. This call can be
used to avoid a more expensive full unmount attempt.
- **AUTOFS_IOC_EXPIRE**:
as described above, this asks if there is
anything suitable to expire. A pointer to a packet::
struct autofs_packet_expire_multi {
int proto_version; /* Protocol version */
int type; /* Type of packet */
autofs_wqt_t wait_queue_token;
int len;
char name[NAME_MAX+1];
};
struct autofs_packet_expire_multi {
struct autofs_packet_hdr hdr;
autofs_wqt_t wait_queue_token;
int len;
char name[NAME_MAX+1];
};
is required. This is filled in with the name of something
that can be unmounted or removed. If nothing can be expired,
`errno` is set to `EAGAIN`. Even though a `wait_queue_token`
is present in the structure, no "wait queue" is established
and no acknowledgment is needed.
- **AUTOFS_IOC_EXPIRE_MULTI**: This is similar to
**AUTOFS_IOC_EXPIRE** except that it causes notification to be
sent to the daemon, and it blocks until the daemon acknowledges.
The argument is an integer which can contain two different flags.
is required. This is filled in with the name of something
that can be unmounted or removed. If nothing can be expired,
`errno` is set to `EAGAIN`. Even though a `wait_queue_token`
is present in the structure, no "wait queue" is established
and no acknowledgment is needed.
- **AUTOFS_IOC_EXPIRE_MULTI**:
This is similar to
**AUTOFS_IOC_EXPIRE** except that it causes notification to be
sent to the daemon, and it blocks until the daemon acknowledges.
The argument is an integer which can contain two different flags.
**AUTOFS_EXP_IMMEDIATE** causes `last_used` time to be ignored
and objects are expired if the are not in use.
**AUTOFS_EXP_IMMEDIATE** causes `last_used` time to be ignored
and objects are expired if the are not in use.
**AUTOFS_EXP_FORCED** causes the in use status to be ignored
and objects are expired ieven if they are in use. This assumes
that the daemon has requested this because it is capable of
performing the umount.
**AUTOFS_EXP_FORCED** causes the in use status to be ignored
and objects are expired ieven if they are in use. This assumes
that the daemon has requested this because it is capable of
performing the umount.
**AUTOFS_EXP_LEAVES** will select a leaf rather than a top-level
name to expire. This is only safe when *maxproto* is 4.
**AUTOFS_EXP_LEAVES** will select a leaf rather than a top-level
name to expire. This is only safe when *maxproto* is 4.
Communicating with autofs: char-device ioctls
---------------------------------------------
=============================================
It is not always possible to open the root of an autofs filesystem,
particularly a *direct* mounted filesystem. If the automount daemon
@ -429,9 +441,9 @@ need there is a "miscellaneous" character device (major 10, minor 235)
which can be used to communicate directly with the autofs filesystem.
It requires CAP_SYS_ADMIN for access.
The `ioctl`s that can be used on this device are described in a separate
The 'ioctl's that can be used on this device are described in a separate
document `autofs-mount-control.txt`, and are summarised briefly here.
Each ioctl is passed a pointer to an `autofs_dev_ioctl` structure:
Each ioctl is passed a pointer to an `autofs_dev_ioctl` structure::
struct autofs_dev_ioctl {
__u32 ver_major;
@ -469,41 +481,50 @@ that the kernel module can support.
Commands are:
- **AUTOFS_DEV_IOCTL_VERSION_CMD**: does nothing, except validate and
set version numbers.
- **AUTOFS_DEV_IOCTL_OPENMOUNT_CMD**: return an open file descriptor
on the root of an autofs filesystem. The filesystem is identified
by name and device number, which is stored in `openmount.devid`.
Device numbers for existing filesystems can be found in
`/proc/self/mountinfo`.
- **AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD**: same as `close(ioctlfd)`.
- **AUTOFS_DEV_IOCTL_SETPIPEFD_CMD**: if the filesystem is in
catatonic mode, this can provide the write end of a new pipe
in `setpipefd.pipefd` to re-establish communication with a daemon.
The process group of the calling process is used to identify the
daemon.
- **AUTOFS_DEV_IOCTL_REQUESTER_CMD**: `path` should be a
name within the filesystem that has been auto-mounted on.
On successful return, `requester.uid` and `requester.gid` will be
the UID and GID of the process which triggered that mount.
- **AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD**: Check if path is a
mountpoint of a particular type - see separate documentation for
details.
- **AUTOFS_DEV_IOCTL_PROTOVER_CMD**:
- **AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD**:
- **AUTOFS_DEV_IOCTL_READY_CMD**:
- **AUTOFS_DEV_IOCTL_FAIL_CMD**:
- **AUTOFS_DEV_IOCTL_CATATONIC_CMD**:
- **AUTOFS_DEV_IOCTL_TIMEOUT_CMD**:
- **AUTOFS_DEV_IOCTL_EXPIRE_CMD**:
- **AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD**: These all have the same
function as the similarly named **AUTOFS_IOC** ioctls, except
that **FAIL** can be given an explicit error number in `fail.status`
instead of assuming `ENOENT`, and this **EXPIRE** command
corresponds to **AUTOFS_IOC_EXPIRE_MULTI**.
- **AUTOFS_DEV_IOCTL_VERSION_CMD**:
does nothing, except validate and
set version numbers.
- **AUTOFS_DEV_IOCTL_OPENMOUNT_CMD**:
return an open file descriptor
on the root of an autofs filesystem. The filesystem is identified
by name and device number, which is stored in `openmount.devid`.
Device numbers for existing filesystems can be found in
`/proc/self/mountinfo`.
- **AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD**:
same as `close(ioctlfd)`.
- **AUTOFS_DEV_IOCTL_SETPIPEFD_CMD**:
if the filesystem is in
catatonic mode, this can provide the write end of a new pipe
in `setpipefd.pipefd` to re-establish communication with a daemon.
The process group of the calling process is used to identify the
daemon.
- **AUTOFS_DEV_IOCTL_REQUESTER_CMD**:
`path` should be a
name within the filesystem that has been auto-mounted on.
On successful return, `requester.uid` and `requester.gid` will be
the UID and GID of the process which triggered that mount.
- **AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD**:
Check if path is a
mountpoint of a particular type - see separate documentation for
details.
- **AUTOFS_DEV_IOCTL_PROTOVER_CMD**
- **AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD**
- **AUTOFS_DEV_IOCTL_READY_CMD**
- **AUTOFS_DEV_IOCTL_FAIL_CMD**
- **AUTOFS_DEV_IOCTL_CATATONIC_CMD**
- **AUTOFS_DEV_IOCTL_TIMEOUT_CMD**
- **AUTOFS_DEV_IOCTL_EXPIRE_CMD**
- **AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD**
These all have the same
function as the similarly named **AUTOFS_IOC** ioctls, except
that **FAIL** can be given an explicit error number in `fail.status`
instead of assuming `ENOENT`, and this **EXPIRE** command
corresponds to **AUTOFS_IOC_EXPIRE_MULTI**.
Catatonic mode
--------------
==============
As mentioned, an autofs mount can enter "catatonic" mode. This
happens if a write to the notification pipe fails, or if it is
@ -527,7 +548,7 @@ Catatonic mode can only be left via the
**AUTOFS_DEV_IOCTL_OPENMOUNT_CMD** ioctl on the `/dev/autofs`.
The "ignore" mount option
-------------------------
=========================
The "ignore" mount option can be used to provide a generic indicator
to applications that the mount entry should be ignored when displaying
@ -542,18 +563,18 @@ This is intended to be used by user space programs to exclude autofs
mounts from consideration when reading the mounts list.
autofs, name spaces, and shared mounts
--------------------------------------
======================================
With bind mounts and name spaces it is possible for an autofs
filesystem to appear at multiple places in one or more filesystem
name spaces. For this to work sensibly, the autofs filesystem should
always be mounted "shared". e.g.
always be mounted "shared". e.g. ::
> `mount --make-shared /autofs/mount/point`
mount --make-shared /autofs/mount/point
The automount daemon is only able to manage a single mount location for
an autofs filesystem and if mounts on that are not 'shared', other
locations will not behave as expected. In particular access to those
other locations will likely result in the `ELOOP` error
other locations will likely result in the `ELOOP` error ::
> Too many levels of symbolic links
Too many levels of symbolic links

1
Documentation/filesystems/index.rst
View File

@ -46,4 +46,5 @@ Documentation for filesystem implementations.
.. toctree::
:maxdepth: 2
autofs
virtiofs

2
Documentation/filesystems/locking.rst
View File

@ -105,7 +105,7 @@ getattr: no
listxattr: no
fiemap: no
update_time: no
atomic_open: exclusive
atomic_open: shared (exclusive if O_CREAT is set in open flags)
tmpfile: no
============ =============================================

2
Documentation/hwmon/inspur-ipsps1.rst
View File

@ -17,7 +17,7 @@ Usage Notes
-----------
This driver does not auto-detect devices. You will have to instantiate the
devices explicitly. Please see Documentation/i2c/instantiating-devices for
devices explicitly. Please see Documentation/i2c/instantiating-devices.rst for
details.
Sysfs entries

2
Documentation/i2c/busses/index.rst
View File

@ -1,4 +1,4 @@
. SPDX-License-Identifier: GPL-2.0
.. SPDX-License-Identifier: GPL-2.0
===============
I2C Bus Drivers

2
Documentation/i2c/index.rst
View File

@ -1,4 +1,4 @@
. SPDX-License-Identifier: GPL-2.0
.. SPDX-License-Identifier: GPL-2.0
===================
I2C/SMBus Subsystem

1
Documentation/index.rst
View File

@ -57,7 +57,6 @@ the kernel interface as seen by application developers.
:maxdepth: 2
userspace-api/index
ioctl/index
Introduction to kernel development

30
Documentation/maintainer/configure-git.rst
View File

@ -32,3 +32,33 @@ You may also like to tell ``gpg`` which ``tty`` to use (add to your shell rc fil
::
export GPG_TTY=$(tty)
Creating commit links to lore.kernel.org
----------------------------------------
The web site http://lore.kernel.org is meant as a grand archive of all mail
list traffic concerning or influencing the kernel development. Storing archives
of patches here is a recommended practice, and when a maintainer applies a
patch to a subsystem tree, it is a good idea to provide a Link: tag with a
reference back to the lore archive so that people that browse the commit
history can find related discussions and rationale behind a certain change.
The link tag will look like this:
Link: https://lore.kernel.org/r/<message-id>
This can be configured to happen automatically any time you issue ``git am``
by adding the following hook into your git:
.. code-block:: none
$ git config am.messageid true
$ cat >.git/hooks/applypatch-msg <<'EOF'
#!/bin/sh
. git-sh-setup
perl -pi -e 's|^Message-Id:\s*<?([^>]+)>?$|Link: https://lore.kernel.org/r/$1|g;' "$1"
test -x "$GIT_DIR/hooks/commit-msg" &&
exec "$GIT_DIR/hooks/commit-msg" ${1+"$@"}
:
EOF
$ chmod a+x .git/hooks/applypatch-msg

1
Documentation/maintainer/index.rst
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@ -12,4 +12,5 @@ additions to this manual.
configure-git
rebasing-and-merging
pull-requests
maintainer-entry-profile

102
Documentation/maintainer/maintainer-entry-profile.rst Normal file
View File

@ -0,0 +1,102 @@
.. _maintainerentryprofile:
Maintainer Entry Profile
========================
The Maintainer Entry Profile supplements the top-level process documents
(submitting-patches, submitting drivers...) with
subsystem/device-driver-local customs as well as details about the patch
submission life-cycle. A contributor uses this document to level set
their expectations and avoid common mistakes, maintainers may use these
profiles to look across subsystems for opportunities to converge on
common practices.
Overview
--------
Provide an introduction to how the subsystem operates. While MAINTAINERS
tells the contributor where to send patches for which files, it does not
convey other subsystem-local infrastructure and mechanisms that aid
development.
Example questions to consider:
- Are there notifications when patches are applied to the local tree, or
merged upstream?
- Does the subsystem have a patchwork instance? Are patchwork state
changes notified?
- Any bots or CI infrastructure that watches the list, or automated
testing feedback that the subsystem gates acceptance?
- Git branches that are pulled into -next?
- What branch should contributors submit against?
- Links to any other Maintainer Entry Profiles? For example a
device-driver may point to an entry for its parent subsystem. This makes
the contributor aware of obligations a maintainer may have have for
other maintainers in the submission chain.
Submit Checklist Addendum
-------------------------
List mandatory and advisory criteria, beyond the common "submit-checklist",
for a patch to be considered healthy enough for maintainer attention.
For example: "pass checkpatch.pl with no errors, or warning. Pass the
unit test detailed at $URI".
The Submit Checklist Addendum can also include details about the status
of related hardware specifications. For example, does the subsystem
require published specifications at a certain revision before patches
will be considered.
Key Cycle Dates
---------------
One of the common misunderstandings of submitters is that patches can be
sent at any time before the merge window closes and can still be
considered for the next -rc1. The reality is that most patches need to
be settled in soaking in linux-next in advance of the merge window
opening. Clarify for the submitter the key dates (in terms rc release
week) that patches might considered for merging and when patches need to
wait for the next -rc. At a minimum:
- Last -rc for new feature submissions:
New feature submissions targeting the next merge window should have
their first posting for consideration before this point. Patches that
are submitted after this point should be clear that they are targeting
the NEXT+1 merge window, or should come with sufficient justification
why they should be considered on an expedited schedule. A general
guideline is to set expectation with contributors that new feature
submissions should appear before -rc5.
- Last -rc to merge features: Deadline for merge decisions
Indicate to contributors the point at which an as yet un-applied patch
set will need to wait for the NEXT+1 merge window. Of course there is no
obligation to ever except any given patchset, but if the review has not
concluded by this point the expectation the contributor should wait and
resubmit for the following merge window.
Optional:
- First -rc at which the development baseline branch, listed in the
overview section, should be considered ready for new submissions.
Review Cadence
--------------
One of the largest sources of contributor angst is how soon to ping
after a patchset has been posted without receiving any feedback. In
addition to specifying how long to wait before a resubmission this
section can also indicate a preferred style of update like, resend the
full series, or privately send a reminder email. This section might also
list how review works for this code area and methods to get feedback
that are not directly from the maintainer.
Existing profiles
-----------------
For now, existing maintainer profiles are listed here; we will likely want
to do something different in the near future.
.. toctree::
:maxdepth: 1
../nvdimm/maintainer-entry-profile

11
Documentation/memory-barriers.txt
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@ -63,7 +63,6 @@ CONTENTS
- Compiler barrier.
- CPU memory barriers.
- MMIO write barrier.
(*) Implicit kernel memory barriers.
@ -75,7 +74,6 @@ CONTENTS
(*) Inter-CPU acquiring barrier effects.
- Acquires vs memory accesses.
- Acquires vs I/O accesses.
(*) Where are memory barriers needed?
@ -492,10 +490,9 @@ And a couple of implicit varieties:
happen before it completes.
The use of ACQUIRE and RELEASE operations generally precludes the need
for other sorts of memory barrier (but note the exceptions mentioned in
the subsection "MMIO write barrier"). In addition, a RELEASE+ACQUIRE
pair is -not- guaranteed to act as a full memory barrier. However, after
an ACQUIRE on a given variable, all memory accesses preceding any prior
for other sorts of memory barrier. In addition, a RELEASE+ACQUIRE pair is
-not- guaranteed to act as a full memory barrier. However, after an
ACQUIRE on a given variable, all memory accesses preceding any prior
RELEASE on that same variable are guaranteed to be visible. In other
words, within a given variable's critical section, all accesses of all
previous critical sections for that variable are guaranteed to have
@ -1512,8 +1509,6 @@ levels:
(*) CPU memory barriers.
(*) MMIO write barrier.
COMPILER BARRIER
----------------

2
Documentation/mips/ingenic-tcu.rst
View File

@ -68,4 +68,4 @@ and frameworks can be controlled from the same registers, all of these
drivers access their registers through the same regmap.
For more information regarding the devicetree bindings of the TCU drivers,
have a look at Documentation/devicetree/bindings/mfd/ingenic,tcu.txt.
have a look at Documentation/devicetree/bindings/timer/ingenic,tcu.txt.

291
Documentation/misc-devices/xilinx_sdfec.rst Normal file
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@ -0,0 +1,291 @@
.. SPDX-License-Identifier: GPL-2.0+
====================
Xilinx SD-FEC Driver
====================
Overview
========
This driver supports SD-FEC Integrated Block for Zynq |Ultrascale+ (TM)| RFSoCs.
.. |Ultrascale+ (TM)| unicode:: Ultrascale+ U+2122
.. with trademark sign
For a full description of SD-FEC core features, see the `SD-FEC Product Guide (PG256) <https://www.xilinx.com/cgi-bin/docs/ipdoc?c=sd_fec;v=latest;d=pg256-sdfec-integrated-block.pdf>`_
This driver supports the following features:
- Retrieval of the Integrated Block configuration and status information
- Configuration of LDPC codes
- Configuration of Turbo decoding
- Monitoring errors
Missing features, known issues, and limitations of the SD-FEC driver are as
follows:
- Only allows a single open file handler to any instance of the driver at any time
- Reset of the SD-FEC Integrated Block is not controlled by this driver
- Does not support shared LDPC code table wraparound
The device tree entry is described in:
`linux-xlnx/Documentation/devicetree/bindings/misc/xlnx,sd-fec.txt <https://github.com/Xilinx/linux-xlnx/blob/master/Documentation/devicetree/bindings/misc/xlnx%2Csd-fec.txt>`_
Modes of Operation
------------------
The driver works with the SD-FEC core in two modes of operation:
- Run-time configuration
- Programmable Logic (PL) initialization
Run-time Configuration
~~~~~~~~~~~~~~~~~~~~~~
For Run-time configuration the role of driver is to allow the software application to do the following:
- Load the configuration parameters for either Turbo decode or LDPC encode or decode
- Activate the SD-FEC core
- Monitor the SD-FEC core for errors
- Retrieve the status and configuration of the SD-FEC core
Programmable Logic (PL) Initialization
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
For PL initialization, supporting logic loads configuration parameters for either
the Turbo decode or LDPC encode or decode. The role of the driver is to allow
the software application to do the following:
- Activate the SD-FEC core
- Monitor the SD-FEC core for errors
- Retrieve the status and configuration of the SD-FEC core
Driver Structure
================
The driver provides a platform device where the ``probe`` and ``remove``
operations are provided.
- probe: Updates configuration register with device-tree entries plus determines the current activate state of the core, for example, is the core bypassed or has the core been started.
The driver defines the following driver file operations to provide user
application interfaces:
- open: Implements restriction that only a single file descriptor can be open per SD-FEC instance at any time
- release: Allows another file descriptor to be open, that is after current file descriptor is closed
- poll: Provides a method to monitor for SD-FEC Error events
- unlocked_ioctl: Provides the the following ioctl commands that allows the application configure the SD-FEC core:
- :c:macro:`XSDFEC_START_DEV`
- :c:macro:`XSDFEC_STOP_DEV`
- :c:macro:`XSDFEC_GET_STATUS`
- :c:macro:`XSDFEC_SET_IRQ`
- :c:macro:`XSDFEC_SET_TURBO`
- :c:macro:`XSDFEC_ADD_LDPC_CODE_PARAMS`
- :c:macro:`XSDFEC_GET_CONFIG`
- :c:macro:`XSDFEC_SET_ORDER`
- :c:macro:`XSDFEC_SET_BYPASS`
- :c:macro:`XSDFEC_IS_ACTIVE`
- :c:macro:`XSDFEC_CLEAR_STATS`
- :c:macro:`XSDFEC_SET_DEFAULT_CONFIG`
Driver Usage
============
Overview
--------
After opening the driver, the user should find out what operations need to be
performed to configure and activate the SD-FEC core and determine the
configuration of the driver.
The following outlines the flow the user should perform:
- Determine Configuration
- Set the order, if not already configured as desired
- Set Turbo decode, LPDC encode or decode parameters, depending on how the
SD-FEC core is configured plus if the SD-FEC has not been configured for PL
initialization
- Enable interrupts, if not already enabled
- Bypass the SD-FEC core, if required
- Start the SD-FEC core if not already started
- Get the SD-FEC core status
- Monitor for interrupts
- Stop the SD-FEC core
Note: When monitoring for interrupts if a critical error is detected where a reset is required, the driver will be required to load the default configuration.
Determine Configuration
-----------------------
Determine the configuration of the SD-FEC core by using the ioctl
:c:macro:`XSDFEC_GET_CONFIG`.
Set the Order
-------------
Setting the order determines how the order of Blocks can change from input to output.
Setting the order is done by using the ioctl :c:macro:`XSDFEC_SET_ORDER`
Setting the order can only be done if the following restrictions are met:
- The ``state`` member of struct :c:type:`xsdfec_status <xsdfec_status>` filled by the ioctl :c:macro:`XSDFEC_GET_STATUS` indicates the SD-FEC core has not STARTED
Add LDPC Codes
--------------
The following steps indicate how to add LDPC codes to the SD-FEC core:
- Use the auto-generated parameters to fill the :c:type:`struct xsdfec_ldpc_params <xsdfec_ldpc_params>` for the desired LDPC code.
- Set the SC, QA, and LA table offsets for the LPDC parameters and the parameters in the structure :c:type:`struct xsdfec_ldpc_params <xsdfec_ldpc_params>`
- Set the desired Code Id value in the structure :c:type:`struct xsdfec_ldpc_params <xsdfec_ldpc_params>`
- Add the LPDC Code Parameters using the ioctl :c:macro:`XSDFEC_ADD_LDPC_CODE_PARAMS`
- For the applied LPDC Code Parameter use the function :c:func:`xsdfec_calculate_shared_ldpc_table_entry_size` to calculate the size of shared LPDC code tables. This allows the user to determine the shared table usage so when selecting the table offsets for the next LDPC code parameters unused table areas can be selected.
- Repeat for each LDPC code parameter.
Adding LDPC codes can only be done if the following restrictions are met:
- The ``code`` member of :c:type:`struct xsdfec_config <xsdfec_config>` filled by the ioctl :c:macro:`XSDFEC_GET_CONFIG` indicates the SD-FEC core is configured as LDPC
- The ``code_wr_protect`` of :c:type:`struct xsdfec_config <xsdfec_config>` filled by the ioctl :c:macro:`XSDFEC_GET_CONFIG` indicates that write protection is not enabled
- The ``state`` member of struct :c:type:`xsdfec_status <xsdfec_status>` filled by the ioctl :c:macro:`XSDFEC_GET_STATUS` indicates the SD-FEC core has not started
Set Turbo Decode
----------------
Configuring the Turbo decode parameters is done by using the ioctl :c:macro:`XSDFEC_SET_TURBO` using auto-generated parameters to fill the :c:type:`struct xsdfec_turbo <xsdfec_turbo>` for the desired Turbo code.
Adding Turbo decode can only be done if the following restrictions are met:
- The ``code`` member of :c:type:`struct xsdfec_config <xsdfec_config>` filled by the ioctl :c:macro:`XSDFEC_GET_CONFIG` indicates the SD-FEC core is configured as TURBO
- The ``state`` member of struct :c:type:`xsdfec_status <xsdfec_status>` filled by the ioctl :c:macro:`XSDFEC_GET_STATUS` indicates the SD-FEC core has not STARTED
Enable Interrupts
-----------------
Enabling or disabling interrupts is done by using the ioctl :c:macro:`XSDFEC_SET_IRQ`. The members of the parameter passed, :c:type:`struct xsdfec_irq <xsdfec_irq>`, to the ioctl are used to set and clear different categories of interrupts. The category of interrupt is controlled as following:
- ``enable_isr`` controls the ``tlast`` interrupts
- ``enable_ecc_isr`` controls the ECC interrupts
If the ``code`` member of :c:type:`struct xsdfec_config <xsdfec_config>` filled by the ioctl :c:macro:`XSDFEC_GET_CONFIG` indicates the SD-FEC core is configured as TURBO then the enabling ECC errors is not required.
Bypass the SD-FEC
-----------------
Bypassing the SD-FEC is done by using the ioctl :c:macro:`XSDFEC_SET_BYPASS`
Bypassing the SD-FEC can only be done if the following restrictions are met:
- The ``state`` member of :c:type:`struct xsdfec_status <xsdfec_status>` filled by the ioctl :c:macro:`XSDFEC_GET_STATUS` indicates the SD-FEC core has not STARTED
Start the SD-FEC core
---------------------
Start the SD-FEC core by using the ioctl :c:macro:`XSDFEC_START_DEV`
Get SD-FEC Status
-----------------
Get the SD-FEC status of the device by using the ioctl :c:macro:`XSDFEC_GET_STATUS`, which will fill the :c:type:`struct xsdfec_status <xsdfec_status>`
Monitor for Interrupts
----------------------
- Use the poll system call to monitor for an interrupt. The poll system call waits for an interrupt to wake it up or times out if no interrupt occurs.
- On return Poll ``revents`` will indicate whether stats and/or state have been updated
- ``POLLPRI`` indicates a critical error and the user should use :c:macro:`XSDFEC_GET_STATUS` and :c:macro:`XSDFEC_GET_STATS` to confirm
- ``POLLRDNORM`` indicates a non-critical error has occurred and the user should use :c:macro:`XSDFEC_GET_STATS` to confirm
- Get stats by using the ioctl :c:macro:`XSDFEC_GET_STATS`
- For critical error the ``isr_err_count`` or ``uecc_count`` member of :c:type:`struct xsdfec_stats <xsdfec_stats>` is non-zero
- For non-critical errors the ``cecc_count`` member of :c:type:`struct xsdfec_stats <xsdfec_stats>` is non-zero
- Get state by using the ioctl :c:macro:`XSDFEC_GET_STATUS`
- For a critical error the ``state`` of :c:type:`xsdfec_status <xsdfec_status>` will indicate a Reset Is Required
- Clear stats by using the ioctl :c:macro:`XSDFEC_CLEAR_STATS`
If a critical error is detected where a reset is required. The application is required to call the ioctl :c:macro:`XSDFEC_SET_DEFAULT_CONFIG`, after the reset and it is not required to call the ioctl :c:macro:`XSDFEC_STOP_DEV`
Note: Using poll system call prevents busy looping using :c:macro:`XSDFEC_GET_STATS` and :c:macro:`XSDFEC_GET_STATUS`
Stop the SD-FEC Core
---------------------
Stop the device by using the ioctl :c:macro:`XSDFEC_STOP_DEV`
Set the Default Configuration
-----------------------------
Load default configuration by using the ioctl :c:macro:`XSDFEC_SET_DEFAULT_CONFIG` to restore the driver.
Limitations
-----------
Users should not duplicate SD-FEC device file handlers, for example fork() or dup() a process that has a created an SD-FEC file handler.
Driver IOCTLs
==============
.. c:macro:: XSDFEC_START_DEV
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_START_DEV
.. c:macro:: XSDFEC_STOP_DEV
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_STOP_DEV
.. c:macro:: XSDFEC_GET_STATUS
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_GET_STATUS
.. c:macro:: XSDFEC_SET_IRQ
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_SET_IRQ
.. c:macro:: XSDFEC_SET_TURBO
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_SET_TURBO
.. c:macro:: XSDFEC_ADD_LDPC_CODE_PARAMS
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_ADD_LDPC_CODE_PARAMS
.. c:macro:: XSDFEC_GET_CONFIG
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_GET_CONFIG
.. c:macro:: XSDFEC_SET_ORDER
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_SET_ORDER
.. c:macro:: XSDFEC_SET_BYPASS
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_SET_BYPASS
.. c:macro:: XSDFEC_IS_ACTIVE
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_IS_ACTIVE
.. c:macro:: XSDFEC_CLEAR_STATS
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_CLEAR_STATS
.. c:macro:: XSDFEC_GET_STATS
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_GET_STATS
.. c:macro:: XSDFEC_SET_DEFAULT_CONFIG
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:doc: XSDFEC_SET_DEFAULT_CONFIG
Driver Type Definitions
=======================
.. kernel-doc:: include/uapi/misc/xilinx_sdfec.h
:internal:

2
Documentation/networking/device_drivers/mellanox/mlx5.rst
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@ -279,7 +279,7 @@ mlx5 tracepoints
================
mlx5 driver provides internal trace points for tracking and debugging using
kernel tracepoints interfaces (refer to Documentation/trace/ftrase.rst).
kernel tracepoints interfaces (refer to Documentation/trace/ftrace.rst).
For the list of support mlx5 events check /sys/kernel/debug/tracing/events/mlx5/

2
Documentation/networking/devlink-trap.rst
View File

@ -233,7 +233,7 @@ help debug packet drops caused by these exceptions. The following list includes
links to the description of driver-specific traps registered by various device
drivers:
* :doc:`/devlink-trap-netdevsim`
* :doc:`devlink-trap-netdevsim`
Generic Packet Trap Groups
==========================

2
Documentation/networking/phy.rst
View File

@ -73,7 +73,7 @@ The Reduced Gigabit Medium Independent Interface (RGMII) is a 12-pin
electrical signal interface using a synchronous 125Mhz clock signal and several
data lines. Due to this design decision, a 1.5ns to 2ns delay must be added
between the clock line (RXC or TXC) and the data lines to let the PHY (clock
sink) have enough setup and hold times to sample the data lines correctly. The
sink) have a large enough setup and hold time to sample the data lines correctly. The
PHY library offers different types of PHY_INTERFACE_MODE_RGMII* values to let
the PHY driver and optionally the MAC driver, implement the required delay. The
values of phy_interface_t must be understood from the perspective of the PHY

59
Documentation/nvdimm/maintainer-entry-profile.rst Normal file
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@ -0,0 +1,59 @@
LIBNVDIMM Maintainer Entry Profile
==================================
Overview
--------
The libnvdimm subsystem manages persistent memory across multiple
architectures. The mailing list, is tracked by patchwork here:
https://patchwork.kernel.org/project/linux-nvdimm/list/
...and that instance is configured to give feedback to submitters on
patch acceptance and upstream merge. Patches are merged to either the
'libnvdimm-fixes', or 'libnvdimm-for-next' branch. Those branches are
available here:
https://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm.git/
In general patches can be submitted against the latest -rc, however if
the incoming code change is dependent on other pending changes then the
patch should be based on the libnvdimm-for-next branch. However, since
persistent memory sits at the intersection of storage and memory there
are cases where patches are more suitable to be merged through a
Filesystem or the Memory Management tree. When in doubt copy the nvdimm
list and the maintainers will help route.
Submissions will be exposed to the kbuild robot for compile regression
testing. It helps to get a success notification from that infrastructure
before submitting, but it is not required.
Submit Checklist Addendum
-------------------------
There are unit tests for the subsystem via the ndctl utility:
https://github.com/pmem/ndctl
Those tests need to be passed before the patches go upstream, but not
necessarily before initial posting. Contact the list if you need help
getting the test environment set up.
### ACPI Device Specific Methods (_DSM)
Before patches enabling for a new _DSM family will be considered it must
be assigned a format-interface-code from the NVDIMM Sub-team of the ACPI
Specification Working Group. In general, the stance of the subsystem is
to push back on the proliferation of NVDIMM command sets, do strongly
consider implementing support for an existing command set. See
drivers/acpi/nfit/nfit.h for the set of support command sets.
Key Cycle Dates
---------------
New submissions can be sent at any time, but if they intend to hit the
next merge window they should be sent before -rc4, and ideally
stabilized in the libnvdimm-for-next branch by -rc6. Of course if a
patch set requires more than 2 weeks of review -rc4 is already too late
and some patches may require multiple development cycles to review.
Review Cadence
--------------
In general, please wait up to one week before pinging for feedback. A
private mail reminder is preferred. Alternatively ask for other
developers that have Reviewed-by tags for libnvdimm changes to take a
look and offer their opinion.

2
Documentation/ioctl/botching-up-ioctls.rst → Documentation/process/botching-up-ioctls.rst
View File

@ -46,7 +46,7 @@ will need to add a 32-bit compat layer:
conversion or worse, fiddle the raw __u64 through your code since that
diminishes the checking tools like sparse can provide. The macro
u64_to_user_ptr can be used in the kernel to avoid warnings about integers
and pointres of different sizes.
and pointers of different sizes.
Basics

2
Documentation/process/embargoed-hardware-issues.rst
View File

@ -240,7 +240,7 @@ an involved disclosed party. The current ambassadors list:
============= ========================================================
ARM
AMD
AMD Tom Lendacky <tom.lendacky@amd.com>
IBM
Intel Tony Luck <tony.luck@intel.com>
Qualcomm Trilok Soni <tsoni@codeaurora.org>

2
Documentation/process/index.rst
View File

@ -46,6 +46,7 @@ Other guides to the community that are of interest to most developers are:
kernel-docs
deprecated
embargoed-hardware-issues
maintainers
These are some overall technical guides that have been put here for now for
lack of a better place.
@ -57,6 +58,7 @@ lack of a better place.
adding-syscalls
magic-number
volatile-considered-harmful
botching-up-ioctls
clang-format
.. only:: subproject and html

1
Documentation/process/maintainers.rst Normal file
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@ -0,0 +1 @@
.. maintainers-include::

53
Documentation/process/submitting-patches.rst
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@ -782,7 +782,58 @@ helpful, you can use the https://lkml.kernel.org/ redirector (e.g., in
the cover email text) to link to an earlier version of the patch series.
16) Sending ``git pull`` requests
16) Providing base tree information
-----------------------------------
When other developers receive your patches and start the review process,
it is often useful for them to know where in the tree history they
should place your work. This is particularly useful for automated CI
processes that attempt to run a series of tests in order to establish
the quality of your submission before the maintainer starts the review.
If you are using ``git format-patch`` to generate your patches, you can
automatically include the base tree information in your submission by
using the ``--base`` flag. The easiest and most convenient way to use
this option is with topical branches::
$ git checkout -t -b my-topical-branch master
Branch 'my-topical-branch' set up to track local branch 'master'.
Switched to a new branch 'my-topical-branch'
[perform your edits and commits]
$ git format-patch --base=auto --cover-letter -o outgoing/ master
outgoing/0000-cover-letter.patch
outgoing/0001-First-Commit.patch
outgoing/...
When you open ``outgoing/0000-cover-letter.patch`` for editing, you will
notice that it will have the ``base-commit:`` trailer at the very
bottom, which provides the reviewer and the CI tools enough information
to properly perform ``git am`` without worrying about conflicts::
$ git checkout -b patch-review [base-commit-id]
Switched to a new branch 'patch-review'
$ git am patches.mbox
Applying: First Commit
Applying: ...
Please see ``man git-format-patch`` for more information about this
option.
.. note::
The ``--base`` feature was introduced in git version 2.9.0.
If you are not using git to format your patches, you can still include
the same ``base-commit`` trailer to indicate the commit hash of the tree
on which your work is based. You should add it either in the cover
letter or in the first patch of the series and it should be placed
either below the ``---`` line or at the very bottom of all other
content, right before your email signature.
17) Sending ``git pull`` requests
---------------------------------
If you have a series of patches, it may be most convenient to have the

2
Documentation/riscv/boot-image-header.rst
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@ -21,7 +21,7 @@ The following 64-byte header is present in decompressed Linux kernel image::
u32 res1 = 0; /* Reserved */
u64 res2 = 0; /* Reserved */
u64 magic = 0x5643534952; /* Magic number, little endian, "RISCV" */
u32 magic2 = 0x56534905; /* Magic number 2, little endian, "RSC\x05" */
u32 magic2 = 0x05435352; /* Magic number 2, little endian, "RSC\x05" */
u32 res4; /* Reserved for PE COFF offset */
This header format is compliant with PE/COFF header and largely inspired from

4
Documentation/scheduler/sched-stats.rst
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@ -28,7 +28,7 @@ of these will need to start with a baseline observation and then calculate
the change in the counters at each subsequent observation. A perl script
which does this for many of the fields is available at
http://eaglet.rain.com/rick/linux/schedstat/
http://eaglet.pdxhosts.com/rick/linux/schedstat/
Note that any such script will necessarily be version-specific, as the main
reason to change versions is changes in the output format. For those wishing
@ -164,4 +164,4 @@ report on how well a particular process or set of processes is faring
under the scheduler's policies. A simple version of such a program is
available at
http://eaglet.rain.com/rick/linux/schedstat/v12/latency.c
http://eaglet.pdxhosts.com/rick/linux/schedstat/v12/latency.c

2
Documentation/security/keys/core.rst
View File

@ -1102,7 +1102,7 @@ payload contents" for more information.
See also Documentation/security/keys/request-key.rst.
* To search for a key in a specific domain, call:
* To search for a key in a specific domain, call::
struct key *request_key_tag(const struct key_type *type,
const char *description,

2
Documentation/security/lsm.rst
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@ -56,7 +56,7 @@ the infrastructure to support security modules. The LSM kernel patch
also moves most of the capabilities logic into an optional security
module, with the system defaulting to the traditional superuser logic.
This capabilities module is discussed further in
`LSM Capabilities Module <#cap>`__.
`LSM Capabilities Module`_.
The LSM kernel patch adds security fields to kernel data structures and
inserts calls to hook functions at critical points in the kernel code to

10
Documentation/sphinx-static/theme_overrides.css
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@ -53,6 +53,16 @@ div[class^="highlight"] pre {
line-height: normal;
}
/* Keep fields from being strangely far apart due to inheirited table CSS. */
.rst-content table.field-list th.field-name {
padding-top: 1px;
padding-bottom: 1px;
}
.rst-content table.field-list td.field-body {
padding-top: 1px;
padding-bottom: 1px;
}
@media screen {
/* content column

17
Documentation/sphinx/kerneldoc.py
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@ -59,9 +59,10 @@ class KernelDocDirective(Directive):
optional_arguments = 4
option_spec = {
'doc': directives.unchanged_required,
'functions': directives.unchanged,
'export': directives.unchanged,
'internal': directives.unchanged,
'identifiers': directives.unchanged,
'functions': directives.unchanged,
}
has_content = False
@ -77,6 +78,10 @@ class KernelDocDirective(Directive):
tab_width = self.options.get('tab-width', self.state.document.settings.tab_width)
# 'function' is an alias of 'identifiers'
if 'functions' in self.options:
self.options['identifiers'] = self.options.get('functions')
# FIXME: make this nicer and more robust against errors
if 'export' in self.options:
cmd += ['-export']
@ -86,11 +91,11 @@ class KernelDocDirective(Directive):
export_file_patterns = str(self.options.get('internal')).split()
elif 'doc' in self.options:
cmd += ['-function', str(self.options.get('doc'))]
elif 'functions' in self.options:
functions = self.options.get('functions').split()
if functions:
for f in functions:
cmd += ['-function', f]
elif 'identifiers' in self.options:
identifiers = self.options.get('identifiers').split()
if identifiers:
for i in identifiers:
cmd += ['-function', i]
else:
cmd += ['-no-doc-sections']

197
Documentation/sphinx/maintainers_include.py Executable file
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@ -0,0 +1,197 @@
#!/usr/bin/env python
# SPDX-License-Identifier: GPL-2.0
# -*- coding: utf-8; mode: python -*-
# pylint: disable=R0903, C0330, R0914, R0912, E0401
u"""
maintainers-include
~~~~~~~~~~~~~~~~~~~
Implementation of the ``maintainers-include`` reST-directive.
:copyright: Copyright (C) 2019 Kees Cook <keescook@chromium.org>
:license: GPL Version 2, June 1991 see linux/COPYING for details.
The ``maintainers-include`` reST-directive performs extensive parsing
specific to the Linux kernel's standard "MAINTAINERS" file, in an
effort to avoid needing to heavily mark up the original plain text.
"""
import sys
import re
import os.path
from docutils import statemachine
from docutils.utils.error_reporting import ErrorString
from docutils.parsers.rst import Directive
from docutils.parsers.rst.directives.misc import Include
__version__ = '1.0'
def setup(app):
app.add_directive("maintainers-include", MaintainersInclude)
return dict(
version = __version__,
parallel_read_safe = True,
parallel_write_safe = True
)
class MaintainersInclude(Include):
u"""MaintainersInclude (``maintainers-include``) directive"""
required_arguments = 0
def parse_maintainers(self, path):
"""Parse all the MAINTAINERS lines into ReST for human-readability"""
result = list()
result.append(".. _maintainers:")
result.append("")
# Poor man's state machine.
descriptions = False
maintainers = False
subsystems = False
# Field letter to field name mapping.
field_letter = None
fields = dict()
prev = None
field_prev = ""
field_content = ""
for line in open(path):
if sys.version_info.major == 2:
line = unicode(line, 'utf-8')
# Have we reached the end of the preformatted Descriptions text?
if descriptions and line.startswith('Maintainers'):
descriptions = False
# Ensure a blank line following the last "|"-prefixed line.
result.append("")
# Start subsystem processing? This is to skip processing the text
# between the Maintainers heading and the first subsystem name.
if maintainers and not subsystems:
if re.search('^[A-Z0-9]', line):
subsystems = True
# Drop needless input whitespace.
line = line.rstrip()
# Linkify all non-wildcard refs to ReST files in Documentation/.
pat = '(Documentation/([^\s\?\*]*)\.rst)'
m = re.search(pat, line)
if m:
# maintainers.rst is in a subdirectory, so include "../".
line = re.sub(pat, ':doc:`%s <../%s>`' % (m.group(2), m.group(2)), line)
# Check state machine for output rendering behavior.
output = None
if descriptions:
# Escape the escapes in preformatted text.
output = "| %s" % (line.replace("\\", "\\\\"))
# Look for and record field letter to field name mappings:
# R: Designated *reviewer*: FullName <address@domain>
m = re.search("\s(\S):\s", line)
if m:
field_letter = m.group(1)
if field_letter and not field_letter in fields:
m = re.search("\*([^\*]+)\*", line)
if m:
fields[field_letter] = m.group(1)
elif subsystems:
# Skip empty lines: subsystem parser adds them as needed.
if len(line) == 0:
continue
# Subsystem fields are batched into "field_content"
if line[1] != ':':
# Render a subsystem entry as:
# SUBSYSTEM NAME
# ~~~~~~~~~~~~~~
# Flush pending field content.
output = field_content + "\n\n"
field_content = ""
# Collapse whitespace in subsystem name.
heading = re.sub("\s+", " ", line)
output = output + "%s\n%s" % (heading, "~" * len(heading))
field_prev = ""
else:
# Render a subsystem field as:
# :Field: entry
# entry...
field, details = line.split(':', 1)
details = details.strip()
# Mark paths (and regexes) as literal text for improved
# readability and to escape any escapes.
if field in ['F', 'N', 'X', 'K']:
# But only if not already marked :)
if not ':doc:' in details:
details = '``%s``' % (details)
# Comma separate email field continuations.
if field == field_prev and field_prev in ['M', 'R', 'L']:
field_content = field_content + ","
# Do not repeat field names, so that field entries
# will be collapsed together.
if field != field_prev:
output = field_content + "\n"
field_content = ":%s:" % (fields.get(field, field))
field_content = field_content + "\n\t%s" % (details)
field_prev = field
else:
output = line
# Re-split on any added newlines in any above parsing.
if output != None:
for separated in output.split('\n'):
result.append(separated)
# Update the state machine when we find heading separators.
if line.startswith('----------'):
if prev.startswith('Descriptions'):
descriptions = True
if prev.startswith('Maintainers'):
maintainers = True
# Retain previous line for state machine transitions.
prev = line
# Flush pending field contents.
if field_content != "":
for separated in field_content.split('\n'):
result.append(separated)
output = "\n".join(result)
# For debugging the pre-rendered results...
#print(output, file=open("/tmp/MAINTAINERS.rst", "w"))
self.state_machine.insert_input(
statemachine.string2lines(output), path)
def run(self):
"""Include the MAINTAINERS file as part of this reST file."""
if not self.state.document.settings.file_insertion_enabled:
raise self.warning('"%s" directive disabled.' % self.name)
# Walk up source path directories to find Documentation/../
path = self.state_machine.document.attributes['source']
path = os.path.realpath(path)
tail = path
while tail != "Documentation" and tail != "":
(path, tail) = os.path.split(path)
# Append "MAINTAINERS"
path = os.path.join(path, "MAINTAINERS")
try:
self.state.document.settings.record_dependencies.add(path)
lines = self.parse_maintainers(path)
except IOError as error:
raise self.severe('Problems with "%s" directive path:\n%s.' %
(self.name, ErrorString(error)))
return []

33
Documentation/sphinx/parallel-wrapper.sh Normal file
View File

@ -0,0 +1,33 @@
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0+
#
# Figure out if we should follow a specific parallelism from the make
# environment (as exported by scripts/jobserver-exec), or fall back to
# the "auto" parallelism when "-jN" is not specified at the top-level
# "make" invocation.
sphinx="$1"
shift || true
parallel="$PARALLELISM"
if [ -z "$parallel" ] ; then
# If no parallelism is specified at the top-level make, then
# fall back to the expected "-jauto" mode that the "htmldocs"
# target has had.
auto=$(perl -e 'open IN,"'"$sphinx"' --version 2>&1 |";
while (<IN>) {
if (m/([\d\.]+)/) {
print "auto" if ($1 >= "1.7")
}
}
close IN')
if [ -n "$auto" ] ; then
parallel="$auto"
fi
fi
# Only if some parallelism has been determined do we add the -jN option.
if [ -n "$parallel" ] ; then
parallel="-j$parallel"
fi
exec "$sphinx" "$parallel" "$@"

0
Documentation/trace/coresight-cpu-debug.rst → Documentation/trace/coresight/coresight-cpu-debug.rst
View File

798
Documentation/trace/coresight/coresight-etm4x-reference.rst Normal file
View File

@ -0,0 +1,798 @@
===============================================
ETMv4 sysfs linux driver programming reference.
===============================================
:Author: Mike Leach <mike.leach@linaro.org>
:Date: October 11th, 2019
Supplement to existing ETMv4 driver documentation.
Sysfs files and directories
---------------------------
Root: ``/sys/bus/coresight/devices/etm<N>``
The following paragraphs explain the association between sysfs files and the
ETMv4 registers that they effect. Note the register names are given without
the ‘TRC’ prefix.
----
:File: ``mode`` (rw)
:Trace Registers: {CONFIGR + others}
:Notes:
Bit select trace features. See ‘mode’ section below. Bits
in this will cause equivalent programming of trace config and
other registers to enable the features requested.
:Syntax & eg:
``echo bitfield > mode``
bitfield up to 32 bits setting trace features.
:Example:
``$> echo 0x012 > mode``
----
:File: ``reset`` (wo)
:Trace Registers: All
:Notes:
Reset all programming to trace nothing / no logic programmed.
:Syntax:
``echo 1 > reset``
----
:File: ``enable_source`` (wo)
:Trace Registers: PRGCTLR, All hardware regs.
:Notes:
- > 0 : Programs up the hardware with the current values held in the driver
and enables trace.
- = 0 : disable trace hardware.
:Syntax:
``echo 1 > enable_source``
----
:File: ``cpu`` (ro)
:Trace Registers: None.
:Notes:
CPU ID that this ETM is attached to.
:Example:
``$> cat cpu``
``$> 0``
----
:File: ``addr_idx`` (rw)
:Trace Registers: None.
:Notes:
Virtual register to index address comparator and range
features. Set index for first of the pair in a range.
:Syntax:
``echo idx > addr_idx``
Where idx < nr_addr_cmp x 2
----
:File: ``addr_range`` (rw)
:Trace Registers: ACVR[idx, idx+1], VIIECTLR
:Notes:
Pair of addresses for a range selected by addr_idx. Include
/ exclude according to the optional parameter, or if omitted
uses the current ‘mode’ setting. Select comparator range in
control register. Error if index is odd value.
:Depends: ``mode, addr_idx``
:Syntax:
``echo addr1 addr2 [exclude] > addr_range``
Where addr1 and addr2 define the range and addr1 < addr2.
Optional exclude value:-
- 0 for include
- 1 for exclude.
:Example:
``$> echo 0x0000 0x2000 0 > addr_range``
----
:File: ``addr_single`` (rw)
:Trace Registers: ACVR[idx]
:Notes:
Set a single address comparator according to addr_idx. This
is used if the address comparator is used as part of event
generation logic etc.
:Depends: ``addr_idx``
:Syntax:
``echo addr1 > addr_single``
----
:File: ``addr_start`` (rw)
:Trace Registers: ACVR[idx], VISSCTLR
:Notes:
Set a trace start address comparator according to addr_idx.
Select comparator in control register.
:Depends: ``addr_idx``
:Syntax:
``echo addr1 > addr_start``
----
:File: ``addr_stop`` (rw)
:Trace Registers: ACVR[idx], VISSCTLR
:Notes:
Set a trace stop address comparator according to addr_idx.
Select comparator in control register.
:Depends: ``addr_idx``
:Syntax:
``echo addr1 > addr_stop``
----
:File: ``addr_context`` (rw)
:Trace Registers: ACATR[idx,{6:4}]
:Notes:
Link context ID comparator to address comparator addr_idx
:Depends: ``addr_idx``
:Syntax:
``echo ctxt_idx > addr_context``
Where ctxt_idx is the index of the linked context id / vmid
comparator.
----
:File: ``addr_ctxtype`` (rw)
:Trace Registers: ACATR[idx,{3:2}]
:Notes:
Input value string. Set type for linked context ID comparator
:Depends: ``addr_idx``
:Syntax:
``echo type > addr_ctxtype``
Type one of {all, vmid, ctxid, none}
:Example:
``$> echo ctxid > addr_ctxtype``
----
:File: ``addr_exlevel_s_ns`` (rw)
:Trace Registers: ACATR[idx,{14:8}]
:Notes:
Set the ELx secure and non-secure matching bits for the
selected address comparator
:Depends: ``addr_idx``
:Syntax:
``echo val > addr_exlevel_s_ns``
val is a 7 bit value for exception levels to exclude. Input
value shifted to correct bits in register.
:Example:
``$> echo 0x4F > addr_exlevel_s_ns``
----
:File: ``addr_instdatatype`` (rw)
:Trace Registers: ACATR[idx,{1:0}]
:Notes:
Set the comparator address type for matching. Driver only
supports setting instruction address type.
:Depends: ``addr_idx``
----
:File: ``addr_cmp_view`` (ro)
:Trace Registers: ACVR[idx, idx+1], ACATR[idx], VIIECTLR
:Notes:
Read the currently selected address comparator. If part of
address range then display both addresses.
:Depends: ``addr_idx``
:Syntax:
``cat addr_cmp_view``
:Example:
``$> cat addr_cmp_view``
``addr_cmp[0] range 0x0 0xffffffffffffffff include ctrl(0x4b00)``
----
:File: ``nr_addr_cmp`` (ro)
:Trace Registers: From IDR4
:Notes:
Number of address comparator pairs
----
:File: ``sshot_idx`` (rw)
:Trace Registers: None
:Notes:
Select single shot register set.
----
:File: ``sshot_ctrl`` (rw)
:Trace Registers: SSCCR[idx]
:Notes:
Access a single shot comparator control register.
:Depends: ``sshot_idx``
:Syntax:
``echo val > sshot_ctrl``
Writes val into the selected control register.
----
:File: ``sshot_status`` (ro)
:Trace Registers: SSCSR[idx]
:Notes:
Read a single shot comparator status register
:Depends: ``sshot_idx``
:Syntax:
``cat sshot_status``
Read status.
:Example:
``$> cat sshot_status``
``0x1``
----
:File: ``sshot_pe_ctrl`` (rw)
:Trace Registers: SSPCICR[idx]
:Notes:
Access a single shot PE comparator input control register.
:Depends: ``sshot_idx``
:Syntax:
``echo val > sshot_pe_ctrl``
Writes val into the selected control register.
----
:File: ``ns_exlevel_vinst`` (rw)
:Trace Registers: VICTLR{23:20}
:Notes:
Program non-secure exception level filters. Set / clear NS
exception filter bits. Setting ‘1’ excludes trace from the
exception level.
:Syntax:
``echo bitfield > ns_exlevel_viinst``
Where bitfield contains bits to set clear for EL0 to EL2
:Example:
``%> echo 0x4 > ns_exlevel_viinst``
Excludes EL2 NS trace.
----
:File: ``vinst_pe_cmp_start_stop`` (rw)
:Trace Registers: VIPCSSCTLR
:Notes:
Access PE start stop comparator input control registers
----
:File: ``bb_ctrl`` (rw)
:Trace Registers: BBCTLR
:Notes:
Define ranges that Branch Broadcast will operate in.
Default (0x0) is all addresses.
:Depends: BB enabled.
----
:File: ``cyc_threshold`` (rw)
:Trace Registers: CCCTLR
:Notes:
Set the threshold for which cycle counts will be emitted.
Error if attempt to set below minimum defined in IDR3, masked
to width of valid bits.
:Depends: CC enabled.
----
:File: ``syncfreq`` (rw)
:Trace Registers: SYNCPR
:Notes:
Set trace synchronisation period. Power of 2 value, 0 (off)
or 8-20. Driver defaults to 12 (every 4096 bytes).
----
:File: ``cntr_idx`` (rw)
:Trace Registers: none
:Notes:
Select the counter to access
:Syntax:
``echo idx > cntr_idx``
Where idx < nr_cntr
----
:File: ``cntr_ctrl`` (rw)
:Trace Registers: CNTCTLR[idx]
:Notes:
Set counter control value.
:Depends: ``cntr_idx``
:Syntax:
``echo val > cntr_ctrl``
Where val is per ETMv4 spec.
----
:File: ``cntrldvr`` (rw)
:Trace Registers: CNTRLDVR[idx]
:Notes:
Set counter reload value.
:Depends: ``cntr_idx``
:Syntax:
``echo val > cntrldvr``
Where val is per ETMv4 spec.
----
:File: ``nr_cntr`` (ro)
:Trace Registers: From IDR5
:Notes:
Number of counters implemented.
----
:File: ``ctxid_idx`` (rw)
:Trace Registers: None
:Notes:
Select the context ID comparator to access
:Syntax:
``echo idx > ctxid_idx``
Where idx < numcidc
----
:File: ``ctxid_pid`` (rw)
:Trace Registers: CIDCVR[idx]
:Notes:
Set the context ID comparator value
:Depends: ``ctxid_idx``
----
:File: ``ctxid_masks`` (rw)
:Trace Registers: CIDCCTLR0, CIDCCTLR1, CIDCVR<0-7>
:Notes:
Pair of values to set the byte masks for 1-8 context ID
comparators. Automatically clears masked bytes to 0 in CID
value registers.
:Syntax:
``echo m3m2m1m0 [m7m6m5m4] > ctxid_masks``
32 bit values made up of mask bytes, where mN represents a
byte mask value for Context ID comparator N.
Second value not required on systems that have fewer than 4
context ID comparators
----
:File: ``numcidc`` (ro)
:Trace Registers: From IDR4
:Notes:
Number of Context ID comparators
----
:File: ``vmid_idx`` (rw)
:Trace Registers: None
:Notes:
Select the VM ID comparator to access.
:Syntax:
``echo idx > vmid_idx``
Where idx <  numvmidc
----
:File: ``vmid_val`` (rw)
:Trace Registers: VMIDCVR[idx]
:Notes:
Set the VM ID comparator value
:Depends: ``vmid_idx``
----
:File: ``vmid_masks`` (rw)
:Trace Registers: VMIDCCTLR0, VMIDCCTLR1, VMIDCVR<0-7>
:Notes:
Pair of values to set the byte masks for 1-8 VM ID comparators.
Automatically clears masked bytes to 0 in VMID value registers.
:Syntax:
``echo m3m2m1m0 [m7m6m5m4] > vmid_masks``
Where mN represents a byte mask value for VMID comparator N.
Second value not required on systems that have fewer than 4
VMID comparators.
----
:File: ``numvmidc`` (ro)
:Trace Registers: From IDR4
:Notes:
Number of VMID comparators
----
:File: ``res_idx`` (rw)
:Trace Registers: None.
:Notes:
Select the resource selector control to access. Must be 2 or
higher as selectors 0 and 1 are hardwired.
:Syntax:
``echo idx > res_idx``
Where 2 <= idx < nr_resource x 2
----
:File: ``res_ctrl`` (rw)
:Trace Registers: RSCTLR[idx]
:Notes:
Set resource selector control value. Value per ETMv4 spec.
:Depends: ``res_idx``
:Syntax:
``echo val > res_cntr``
Where val is per ETMv4 spec.
----
:File: ``nr_resource`` (ro)
:Trace Registers: From IDR4
:Notes:
Number of resource selector pairs
----
:File: ``event`` (rw)
:Trace Registers: EVENTCTRL0R
:Notes:
Set up to 4 implemented event fields.
:Syntax:
``echo ev3ev2ev1ev0 > event``
Where evN is an 8 bit event field. Up to 4 event fields make up the
32-bit input value. Number of valid fields is implementation dependent,
defined in IDR0.
----
:File: ``event_instren`` (rw)
:Trace Registers: EVENTCTRL1R
:Notes:
Choose events which insert event packets into trace stream.
:Depends: EVENTCTRL0R
:Syntax:
``echo bitfield > event_instren``
Where bitfield is up to 4 bits according to number of event fields.
----
:File: ``event_ts`` (rw)
:Trace Registers: TSCTLR
:Notes:
Set the event that will generate timestamp requests.
:Depends: ``TS activated``
:Syntax:
``echo evfield > event_ts``
Where evfield is an 8 bit event selector.
----
:File: ``seq_idx`` (rw)
:Trace Registers: None
:Notes:
Sequencer event register select - 0 to 2
----
:File: ``seq_state`` (rw)
:Trace Registers: SEQSTR
:Notes:
Sequencer current state - 0 to 3.
----
:File: ``seq_event`` (rw)
:Trace Registers: SEQEVR[idx]
:Notes:
State transition event registers
:Depends: ``seq_idx``
:Syntax:
``echo evBevF > seq_event``
Where evBevF is a 16 bit value made up of two event selectors,
- evB : back
- evF : forwards.
----
:File: ``seq_reset_event`` (rw)
:Trace Registers: SEQRSTEVR
:Notes:
Sequencer reset event
:Syntax:
``echo evfield > seq_reset_event``
Where evfield is an 8 bit event selector.
----
:File: ``nrseqstate`` (ro)
:Trace Registers: From IDR5
:Notes:
Number of sequencer states (0 or 4)
----
:File: ``nr_pe_cmp`` (ro)
:Trace Registers: From IDR4
:Notes:
Number of PE comparator inputs
----
:File: ``nr_ext_inp`` (ro)
:Trace Registers: From IDR5
:Notes:
Number of external inputs
----
:File: ``nr_ss_cmp`` (ro)
:Trace Registers: From IDR4
:Notes:
Number of Single Shot control registers
----
*Note:* When programming any address comparator the driver will tag the
comparator with a type used - i.e. RANGE, SINGLE, START, STOP. Once this tag
is set, then only the values can be changed using the same sysfs file / type
used to program it.
Thus::
% echo 0 > addr_idx ; select address comparator 0
% echo 0x1000 0x5000 0 > addr_range ; set address range on comparators 0, 1.
% echo 0x2000 > addr_start ; error as comparator 0 is a range comparator
% echo 2 > addr_idx ; select address comparator 2
% echo 0x2000 > addr_start ; this is OK as comparator 2 is unused.
% echo 0x3000 > addr_stop ; error as comparator 2 set as start address.
% echo 2 > addr_idx ; select address comparator 3
% echo 0x3000 > addr_stop ; this is OK
To remove programming on all the comparators (and all the other hardware) use
the reset parameter::
% echo 1 > reset
The ‘mode’ sysfs parameter.
---------------------------
This is a bitfield selection parameter that sets the overall trace mode for the
ETM. The table below describes the bits, using the defines from the driver
source file, along with a description of the feature these represent. Many
features are optional and therefore dependent on implementation in the
hardware.
Bit assignments shown below:-
----
**bit (0):**
ETM_MODE_EXCLUDE
**description:**
This is the default value for the include / exclude function when
setting address ranges. Set 1 for exclude range. When the mode
parameter is set this value is applied to the currently indexed
address range.
**bit (4):**
ETM_MODE_BB
**description:**
Set to enable branch broadcast if supported in hardware [IDR0].
**bit (5):**
ETMv4_MODE_CYCACC
**description:**
Set to enable cycle accurate trace if supported [IDR0].
**bit (6):**
ETMv4_MODE_CTXID
**description:**
Set to enable context ID tracing if supported in hardware [IDR2].
**bit (7):**
ETM_MODE_VMID
**description:**
Set to enable virtual machine ID tracing if supported [IDR2].
**bit (11):**
ETMv4_MODE_TIMESTAMP
**description:**
Set to enable timestamp generation if supported [IDR0].
**bit (12):**
ETM_MODE_RETURNSTACK
**description:**
Set to enable trace return stack use if supported [IDR0].
**bit (13-14):**
ETM_MODE_QELEM(val)
**description:**
‘val’ determines level of Q element support enabled if
implemented by the ETM [IDR0]
**bit (19):**
ETM_MODE_ATB_TRIGGER
**description:**
Set to enable the ATBTRIGGER bit in the event control register
[EVENTCTLR1] if supported [IDR5].
**bit (20):**
ETM_MODE_LPOVERRIDE
**description:**
Set to enable the LPOVERRIDE bit in the event control register
[EVENTCTLR1], if supported [IDR5].
**bit (21):**
ETM_MODE_ISTALL_EN
**description:**
Set to enable the ISTALL bit in the stall control register
[STALLCTLR]
**bit (23):**
ETM_MODE_INSTPRIO
**description:**
Set to enable the INSTPRIORITY bit in the stall control register
[STALLCTLR] , if supported [IDR0].
**bit (24):**
ETM_MODE_NOOVERFLOW
**description:**
Set to enable the NOOVERFLOW bit in the stall control register
[STALLCTLR], if supported [IDR3].
**bit (25):**
ETM_MODE_TRACE_RESET
**description:**
Set to enable the TRCRESET bit in the viewinst control register
[VICTLR] , if supported [IDR3].
**bit (26):**
ETM_MODE_TRACE_ERR
**description:**
Set to enable the TRCCTRL bit in the viewinst control register
[VICTLR].
**bit (27):**
ETM_MODE_VIEWINST_STARTSTOP
**description:**
Set the initial state value of the ViewInst start / stop logic
in the viewinst control register [VICTLR]
**bit (30):**
ETM_MODE_EXCL_KERN
**description:**
Set default trace setup to exclude kernel mode trace (see note a)
**bit (31):**
ETM_MODE_EXCL_USER
**description:**
Set default trace setup to exclude user space trace (see note a)
----
*Note a)* On startup the ETM is programmed to trace the complete address space
using address range comparator 0. ‘mode’ bits 30 / 31 modify this setting to
set EL exclude bits for NS state in either user space (EL0) or kernel space
(EL1) in the address range comparator. (the default setting excludes all
secure EL, and NS EL2)
Once the reset parameter has been used, and/or custom programming has been
implemented - using these bits will result in the EL bits for address
comparator 0 being set in the same way.
*Note b)* Bits 2-3, 8-10, 15-16, 18, 22, control features that only work with
data trace. As A-profile data trace is architecturally prohibited in ETMv4,
these have been omitted here. Possible uses could be where a kernel has
support for control of R or M profile infrastructure as part of a heterogeneous
system.
Bits 17, 28-29 are unused.

2
Documentation/trace/coresight.rst → Documentation/trace/coresight/coresight.rst
View File

@ -489,7 +489,7 @@ interface provided for that purpose by the generic STM API::
crw------- 1 root root 10, 61 Jan 3 18:11 /dev/stm0
root@genericarmv8:~#
Details on how to use the generic STM API can be found here [#second]_.
Details on how to use the generic STM API can be found here:- :doc:`../stm` [#second]_.
.. [#first] Documentation/ABI/testing/sysfs-bus-coresight-devices-stm

9
Documentation/trace/coresight/index.rst Normal file
View File

@ -0,0 +1,9 @@
==============================
CoreSight - ARM Hardware Trace
==============================
.. toctree::
:maxdepth: 2
:glob:
*

3
Documentation/trace/index.rst
View File

@ -23,5 +23,4 @@ Linux Tracing Technologies
intel_th
stm
sys-t
coresight
coresight-cpu-debug
coresight/index

2
Documentation/translations/it_IT/process/maintainer-pgp-guide.rst
View File

@ -455,7 +455,7 @@ soluzioni disponibili:
`GnuK`_ della FSIJ. Questo è uno dei pochi dispositivi a supportare le chiavi
ECC ED25519, ma offre meno funzionalità di sicurezza (come la resistenza
alla manomissione o alcuni attacchi ad un canale laterale).
- `Nitrokey Pro`_: è simile alla Nitrokey Start, ma è più resistente alla
- `Nitrokey Pro 2`_: è simile alla Nitrokey Start, ma è più resistente alla
manomissione e offre più funzionalità di sicurezza. La Pro 2 supporta la
crittografia ECC (NISTP).
- `Yubikey 5`_: l'hardware e il software sono proprietari, ma è più economica

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@ -240,21 +240,21 @@ ReST 마크업을 사용하는 문서들은 Documentation/output 에 생성된
서브시스템에 특화된 커널 브랜치들로 구성된다. 몇몇 다른 메인
브랜치들은 다음과 같다.
- main 4.x 커널 트리
- 4.x.y - 안정된 커널 트리
- 서브시스템을 위한 커널 트리들과 패치들
- 4.x - 통합 테스트를 위한 next 커널 트리
- 리누스의 메인라인 트리
- 여러 메이저 넘버를 갖는 다양한 안정된 커널 트리들
- 서브시스템을 위한 커널 트리들
- 통합 테스트를 위한 linux-next 커널 트리
4.x 커널 트리
메인라인 트리
~~~~~~~~~~~~~
4.x 커널들은 Linus Torvalds가 관리하며 https://kernel.org 의
pub/linux/kernel/v4.x/ 디렉토리에서 참조될 수 있다.개발 프로세스는 다음과 같다.
메인라인 트리는 Linus Torvalds가 관리하며 https://kernel.org 또는 소스
저장소에서 참조될 수 있다.개발 프로세스는 다음과 같다.
- 새로운 커널이 배포되자마자 2주의 시간이 주어진다. 이 기간동은
메인테이너들은 큰 diff들을 Linus에게 제출할 수 있다. 대개 이 패치들은
몇 주 동안 -next 커널내에 이미 있었던 것들이다. 큰 변경들을 제출하는 데
선호되는 방법은 git(커널의 소스 관리 툴, 더 많은 정보들은
몇 주 동안 linux-next 커널내에 이미 있었던 것들이다. 큰 변경들을 제출하는
데 선호되는 방법은 git(커널의 소스 관리 툴, 더 많은 정보들은
https://git-scm.com/ 에서 참조할 수 있다)를 사용하는 것이지만 순수한
패치파일의 형식으로 보내는 것도 무관하다.
- 2주 후에 -rc1 커널이 릴리즈되며 여기서부터의 주안점은 새로운 커널을
@ -281,28 +281,25 @@ Andrew Morton의 글이 있다.
버그의 상황에 따라 배포되는 것이지 미리정해 놓은 시간에 따라
배포되는 것은 아니기 때문이다."*
4.x.y - 안정 커널 트리
~~~~~~~~~~~~~~~~~~~~~~
여러 메이저 넘버를 갖는 다양한 안정된 커널 트리들
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
3 자리 숫자로 이루어진 버젼의 커널들은 -stable 커널들이다. 그것들은 4.x
커널에서 발견된 큰 회귀들이나 보안 문제들 중 비교적 작고 중요한 수정들을
포함한다.
3 자리 숫자로 이루어진 버젼의 커널들은 -stable 커널들이다. 그것들은 해당 메이저
메인라인 릴리즈에서 발견된 큰 회귀들이나 보안 문제들 중 비교적 작고 중요한
수정들을 포함하며, 앞의 두 버전 넘버는 같은 기반 버전을 의미한다.
이것은 가장 최근의 안정적인 커널을 원하는 사용자에게 추천되는 브랜치이며,
개발/실험적 버젼을 테스트하는 것을 돕고자 하는 사용자들과는 별로 관련이 없다.
어떤 4.x.y 커널도 사용할 수 없다면 그때는 가장 높은 숫자의 4.x
커널이 현재의 안정 커널이다.
4.x.y는 "stable" 팀<stable@vger.kernel.org>에 의해 관리되며 거의 매번 격주로
배포된다.
-stable 트리들은 "stable" 팀<stable@vger.kernel.org>에 의해 관리되며 거의 매번
격주로 배포된다.
커널 트리 문서들 내의 :ref:`Documentation/process/stable-kernel-rules.rst <stable_kernel_rules>`
파일은 어떤 종류의 변경들이 -stable 트리로 들어왔는지와
배포 프로세스가 어떻게 진행되는지를 설명한다.
서브시스템 커널 트리들과 패치들
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
서브시스템 커널 트리들
~~~~~~~~~~~~~~~~~~~~~~
다양한 커널 서브시스템의 메인테이너들 --- 그리고 많은 커널 서브시스템 개발자들
--- 은 그들의 현재 개발 상태를 소스 저장소로 노출한다. 이를 통해 다른 사람들도
@ -324,17 +321,18 @@ Andrew Morton의 글이 있다.
대부분의 이러한 patchwork 사이트는 https://patchwork.kernel.org/ 또는
http://patchwork.ozlabs.org/ 에 나열되어 있다.
4.x - 통합 테스트를 위한 next 커널 트리
---------------------------------------
서브시스템 트리들의 변경사항들은 mainline 4.x 트리로 들어오기 전에 통합
테스트를 거쳐야 한다. 이런 목적으로, 모든 서브시스템 트리의 변경사항을 거의
매일 받아가는 특수한 테스트 저장소가 존재한다:
통합 테스트를 위한 linux-next 커널 트리
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
서브시스템 트리들의 변경사항들은 mainline 트리로 들어오기 전에 통합 테스트를
거쳐야 한다. 이런 목적으로, 모든 서브시스템 트리의 변경사항을 거의 매일
받아가는 특수한 테스트 저장소가 존재한다:
https://git.kernel.org/?p=linux/kernel/git/sfr/linux-next.git
이런 식으로, -next 커널을 통해 다음 머지 기간에 메인라인 커널에 어떤 변경이
가해질 것인지 간략히 알 수 있다. 모험심 강한 테스터라면 -next 커널에서 테스트를
수행하는 것도 좋을 것이다.
이런 식으로, linux-next 커널을 통해 다음 머지 기간에 메인라인 커널에 어떤
변경이 가해질 것인지 간략히 알 수 있다. 모험심 강한 테스터라면 linux-next
커널에서 테스트를 수행하는 것도 좋을 것이다.
버그 보고

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@ -3,8 +3,8 @@
\renewcommand\thesection*
\renewcommand\thesubsection*
Korean translations
===================
한국어 번역
===========
.. toctree::
:maxdepth: 1

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@ -1907,21 +1907,6 @@ Mandatory 배리어들은 SMP 시스템에서도 UP 시스템에서도 SMP 효
위해선 Documentation/DMA-API.txt 문서를 참고하세요.
MMIO 쓰기 배리어
----------------
리눅스 커널은 또한 memory-mapped I/O 쓰기를 위한 특별한 배리어도 가지고
있습니다:
mmiowb();
이것은 mandatory 쓰기 배리어의 변종으로, 완화된 순서 규칙의 I/O 영역에으로의
쓰기가 부분적으로 순서를 맞추도록 해줍니다. 이 함수는 CPU->하드웨어 사이를
넘어서 실제 하드웨어에까지 일부 수준의 영향을 끼칩니다.
더 많은 정보를 위해선 "Acquire vs I/O 액세스" 서브섹션을 참고하세요.
=========================
암묵적 커널 메모리 배리어
=========================
@ -2283,73 +2268,6 @@ ACQUIRE VS 메모리 액세스
*E, *F or *G following RELEASE Q
ACQUIRE VS I/O 액세스
----------------------
특정한 (특히 NUMA 가 관련된) 환경 하에서 두개의 CPU 에서 동일한 스핀락으로
보호되는 두개의 크리티컬 섹션 안의 I/O 액세스는 PCI 브릿지에 겹쳐진 I/O
액세스로 보일 수 있는데, PCI 브릿지는 캐시 일관성 프로토콜과 합을 맞춰야 할
의무가 없으므로, 필요한 읽기 메모리 배리어가 요청되지 않기 때문입니다.
예를 들어서:
CPU 1 CPU 2
=============================== ===============================
spin_lock(Q)
writel(0, ADDR)
writel(1, DATA);
spin_unlock(Q);
spin_lock(Q);
writel(4, ADDR);
writel(5, DATA);
spin_unlock(Q);
는 PCI 브릿지에 다음과 같이 보일 수 있습니다:
STORE *ADDR = 0, STORE *ADDR = 4, STORE *DATA = 1, STORE *DATA = 5
이렇게 되면 하드웨어의 오동작을 일으킬 수 있습니다.
이런 경우엔 잡아둔 스핀락을 내려놓기 전에 mmiowb() 를 수행해야 하는데, 예를
들면 다음과 같습니다:
CPU 1 CPU 2
=============================== ===============================
spin_lock(Q)
writel(0, ADDR)
writel(1, DATA);
mmiowb();
spin_unlock(Q);
spin_lock(Q);
writel(4, ADDR);
writel(5, DATA);
mmiowb();
spin_unlock(Q);
이 코드는 CPU 1 에서 요청된 두개의 스토어가 PCI 브릿지에 CPU 2 에서 요청된
스토어들보다 먼저 보여짐을 보장합니다.
또한, 같은 디바이스에서 스토어를 이어 로드가 수행되면 이 로드는 로드가 수행되기
전에 스토어가 완료되기를 강제하므로 mmiowb() 의 필요가 없어집니다:
CPU 1 CPU 2
=============================== ===============================
spin_lock(Q)
writel(0, ADDR)
a = readl(DATA);
spin_unlock(Q);
spin_lock(Q);
writel(4, ADDR);
b = readl(DATA);
spin_unlock(Q);
더 많은 정보를 위해선 Documentation/driver-api/device-io.rst 를 참고하세요.
=========================
메모리 배리어가 필요한 곳
=========================
@ -2494,14 +2412,9 @@ _않습니다_.
리눅스 커널 내부에서, I/O 는 어떻게 액세스들을 적절히 순차적이게 만들 수 있는지
알고 있는, - inb() 나 writel() 과 같은 - 적절한 액세스 루틴을 통해 이루어져야만
합니다. 이것들은 대부분의 경우에는 명시적 메모리 배리어 와 함께 사용될 필요가
없습니다만, 다음의 두가지 상황에서는 명시적 메모리 배리어가 필요할 수 있습니다:
(1) 일부 시스템에서 I/O 스토어는 모든 CPU 에 일관되게 순서 맞춰지지 않는데,
따라서 _모든_ 일반적인 드라이버들에 락이 사용되어야만 하고 이 크리티컬
섹션을 빠져나오기 전에 mmiowb() 가 꼭 호출되어야 합니다.
(2) 만약 액세스 함수들이 완화된 메모리 액세스 속성을 갖는 I/O 메모리 윈도우를
사용한다면, 순서를 강제하기 위해선 _mandatory_ 메모리 배리어가 필요합니다.
없습니다만, 완화된 메모리 액세스 속성으로 I/O 메모리 윈도우로의 참조를 위해
액세스 함수가 사용된다면 순서를 강제하기 위해 _madatory_ 메모리 배리어가
필요합니다.
더 많은 정보를 위해선 Documentation/driver-api/device-io.rst 를 참고하십시오.
@ -2545,10 +2458,9 @@ _않습니다_.
인터럽트 내에서 일어난 액세스와 섞일 수 있다고 - 그리고 그 반대도 - 가정해야만
합니다.
그런 영역 안에서 일어나는 I/O 액세스들은 엄격한 순서 규칙의 I/O 레지스터에
묵시적 I/O 배리어를 형성하는 동기적 (synchronous) 로드 오퍼레이션을 포함하기
때문에 일반적으로는 이런게 문제가 되지 않습니다. 만약 이걸로는 충분치 않다면
mmiowb() 가 명시적으로 사용될 필요가 있습니다.
그런 영역 안에서 일어나는 I/O 액세스는 묵시적 I/O 배리어를 형성하는, 엄격한
순서 규칙의 I/O 레지스터로의 로드 오퍼레이션을 포함하기 때문에 일반적으로는
문제가 되지 않습니다.
하나의 인터럽트 루틴과 별도의 CPU 에서 수행중이며 서로 통신을 하는 두 루틴
@ -2560,67 +2472,102 @@ mmiowb() 가 명시적으로 사용될 필요가 있습니다.
커널 I/O 배리어의 효과
======================
I/O 메모리에 액세스할 때, 드라이버는 적절한 액세스 함수를 사용해야 합니다:
(*) inX(), outX():
이것들은 메모리 공간보다는 I/O 공간에 이야기를 하려는 의도로
만들어졌습니다만, 그건 기본적으로 CPU 마다 다른 컨셉입니다. i386 과
x86_64 프로세서들은 특별한 I/O 공간 액세스 사이클과 명령어를 실제로 가지고
있지만, 다른 많은 CPU 들에는 그런 컨셉이 존재하지 않습니다.
다른 것들 중에서도 PCI 버스가 I/O 공간 컨셉을 정의하는데, 이는 - i386 과
x86_64 같은 CPU 에서 - CPU 의 I/O 공간 컨셉으로 쉽게 매치됩니다. 하지만,
대체할 I/O 공간이 없는 CPU 에서는 CPU 의 메모리 맵의 가상 I/O 공간으로
매핑될 수도 있습니다.
이 공간으로의 액세스는 (i386 등에서는) 완전하게 동기화 됩니다만, 중간의
(PCI 호스트 브리지와 같은) 브리지들은 이를 완전히 보장하진 않을수도
있습니다.
이것들의 상호간의 순서는 완전하게 보장됩니다.
다른 타입의 메모리 오퍼레이션, I/O 오퍼레이션에 대한 순서는 완전하게
보장되지는 않습니다.
I/O 액세스를 통한 주변장치와의 통신은 아키텍쳐와 기기에 매우 종속적입니다.
따라서, 본질적으로 이식성이 없는 드라이버는 가능한 가장 적은 오버헤드로
동기화를 하기 위해 각자의 타겟 시스템의 특정 동작에 의존할 겁니다. 다양한
아키텍쳐와 버스 구현에 이식성을 가지려 하는 드라이버를 위해, 커널은 다양한
정도의 순서 보장을 제공하는 일련의 액세스 함수를 제공합니다.
(*) readX(), writeX():
이것들이 수행 요청되는 CPU 에서 서로에게 완전히 순서가 맞춰지고 독립적으로
수행되는지에 대한 보장 여부는 이들이 액세스 하는 메모리 윈도우에 정의된
특성에 의해 결정됩니다. 예를 들어, 최신의 i386 아키텍쳐 머신에서는 MTRR
레지스터로 이 특성이 조정됩니다.
readX() 와 writeX() MMIO 액세스 함수는 접근되는 주변장치로의 포인터를
__iomem * 패러미터로 받습니다. 디폴트 I/O 기능으로 매핑되는 포인터
(예: ioremap() 으로 반환되는 것) 의 순서 보장은 다음과 같습니다:
일반적으로는, 프리페치 (prefetch) 가능한 디바이스를 액세스 하는게
아니라면, 이것들은 완전히 순서가 맞춰지고 결합되지 않게 보장될 겁니다.
1. 같은 주변장치로의 모든 readX() 와 writeX() 액세스는 각자에 대해
순서지어집니다. 이는 같은 CPU 쓰레드에 의한 특정 디바이스로의 MMIO
레지스터 액세스가 프로그램 순서대로 도착할 것을 보장합니다.
하지만, (PCI 브리지와 같은) 중간의 하드웨어는 자신이 원한다면 집행을
연기시킬 수 있습니다; 스토어 명령을 실제로 하드웨어로 내려보내기(flush)
위해서는 같은 위치로부터 로드를 하는 방법이 있습니다만[*], PCI 의 경우는
같은 디바이스나 환경 구성 영역에서의 로드만으로도 충분할 겁니다.
2. 한 스핀락을 잡은 CPU 쓰레드에 의한 writeX() 는 같은 스핀락을 나중에
잡은 다른 CPU 쓰레드에 의해 같은 주변장치를 향해 호출된 writeX()
앞으로 순서지어집니다. 이는 스핀락을 잡은 채 특정 디바이스를 향해
호출된 MMIO 레지스터 쓰기는 해당 락의 획득에 일관적인 순서로 도달할
것을 보장합니다.
[*] 주의! 쓰여진 것과 같은 위치로부터의 로드를 시도하는 것은 오동작을
일으킬 수도 있습니다 - 예로 16650 Rx/Tx 시리얼 레지스터를 생각해
보세요.
3. 특정 주변장치를 향한 특정 CPU 쓰레드의 writeX() 는 먼저 해당
쓰레드로 전파되는, 또는 해당 쓰레드에 의해 요청된 모든 앞선 메모리
쓰기가 완료되기 전까지 먼저 기다립니다. 이는 dma_alloc_coherent()
를 통해 할당된 전송용 DMA 버퍼로의 해당 CPU 의 쓰기가 이 CPU 가 이
전송을 시작시키기 위해 MMIO 컨트롤 레지스터에 쓰기를 할 때 DMA
엔진에 보여질 것을 보장합니다.
프리페치 가능한 I/O 메모리가 사용되면, 스토어 명령들이 순서를 지키도록
하기 위해 mmiowb() 배리어가 필요할 수 있습니다.
4. 특정 CPU 쓰레드에 의한 주변장치로의 readX() 는 같은 쓰레드에 의한
모든 뒤따르는 메모리 읽기가 시작되기 전에 완료됩니다. 이는
dma_alloc_coherent() 를 통해 할당된 수신용 DMA 버퍼로부터의 CPU 의
읽기는 이 DMA 수신의 완료를 표시하는 DMA 엔진의 MMIO 상태 레지스터
읽기 후에는 오염된 데이터를 읽지 않을 것을 보장합니다.
PCI 트랜잭션 사이의 상호작용에 대해 더 많은 정보를 위해선 PCI 명세서를
참고하시기 바랍니다.
5. CPU 에 의한 주변장치로의 readX() 는 모든 뒤따르는 delay() 루프가
수행을 시작하기 전에 완료됩니다. 이는 CPU 의 특정
주변장치로의 두개의 MMIO 레지스터 쓰기가 행해지는데 첫번째 쓰기가
readX() 를 통해 곧바로 읽어졌고 이어 두번째 writeX() 전에 udelay(1)
이 호출되었다면 이 두개의 쓰기는 최소 1us 의 간격을 두고 행해질 것을
보장합니다:
writel(42, DEVICE_REGISTER_0); // 디바이스에 도착함...
readl(DEVICE_REGISTER_0);
udelay(1);
writel(42, DEVICE_REGISTER_1); // ...이것보다 최소 1us 전에.
디폴트가 아닌 기능을 통해 얻어지는 __iomem 포인터 (예: ioremap_wc() 를
통해 리턴되는 것) 의 순서 속성은 실제 아키텍쳐에 의존적이어서 이런
종류의 매핑으로의 액세스는 앞서 설명된 보장사항에 의존할 수 없습니다.
(*) readX_relaxed(), writeX_relaxed()
이것들은 readX() 와 writeX() 랑 비슷하지만, 더 완화된 메모리 순서 보장을
제공합니다. 구체적으로, 이것들은 일반적 메모리 액세스 (예: DMA 버퍼) 에도
LOCK 이나 UNLOCK 오퍼레이션들에도 순서를 보장하지 않습니다. LOCK 이나
UNLOCK 오퍼레이션들에 맞춰지는 순서가 필요하다면, mmiowb() 배리어가 사용될
수 있습니다. 같은 주변 장치에의 완화된 액세스끼리는 순서가 지켜짐을 알아
두시기 바랍니다.
이것들은 readX() 와 writeX() 랑 비슷하지만, 더 완화된 메모리 순서
보장을 제공합니다. 구체적으로, 이것들은 일반적 메모리 액세스나 delay()
루프 (예:앞의 2-5 항목) 에 대해 순서를 보장하지 않습니다만 디폴트 I/O
기능으로 매핑된 __iomem 포인터에 대해 동작할 때, 같은 CPU 쓰레드에 의해
같은 주변장치로의 액세스에는 순서가 맞춰질 것이 보장됩니다.
(*) readsX(), writesX():
readsX() 와 writesX() MMIO 액세스 함수는 DMA 를 수행하는데 적절치 않은,
주변장치 내의 메모리 매핑된 레지스터 기반 FIFO 로의 액세스를 위해
설계되었습니다. 따라서, 이 기능들은 앞서 설명된 readX_relaxed() 와
writeX_relaxed() 의 순서 보장만을 제공합니다.
(*) inX(), outX():
inX() 와 outX() 액세스 함수는 일부 아키텍쳐 (특히 x86) 에서는 특수한
명령어를 필요로 하며 포트에 매핑되는, 과거의 유산인 I/O 주변장치로의
접근을 위해 만들어졌습니다.
많은 CPU 아키텍쳐가 결국은 이런 주변장치를 내부의 가상 메모리 매핑을
통해 접근하기 때문에, inX() 와 outX() 가 제공하는 이식성 있는 순서
보장은 디폴트 I/O 기능을 통한 매핑을 접근할 때의 readX() 와 writeX() 에
의해 제공되는 것과 각각 동일합니다.
디바이스 드라이버는 outX() 가 리턴하기 전에 해당 I/O 주변장치로부터의
완료 응답을 기다리는 쓰기 트랜잭션을 만들어 낸다고 기대할 수도
있습니다. 이는 모든 아키텍쳐에서 보장되지는 않고, 따라서 이식성 있는
순서 규칙의 일부분이 아닙니다.
(*) insX(), outsX():
앞에서와 같이, insX() 와 outsX() 액세스 함수는 디폴트 I/O 기능을 통한
매핑을 접근할 때 각각 readX() 와 writeX() 와 같은 순서 보장을
제공합니다.
(*) ioreadX(), iowriteX()
이것들은 inX()/outX() 나 readX()/writeX() 처럼 실제로 수행하는 액세스의
종류에 따라 적절하게 수행될 것입니다.
이것들은 inX()/outX() 나 readX()/writeX() 처럼 실제로 수행하는 액세스의
종류에 따라 적절하게 수행될 것입니다.
String 액세스 함수 (insX(), outsX(), readsX() 그리고 writesX()) 의 예외를
제외하고는, 앞의 모든 것이 아랫단의 주변장치가 little-endian 이라 가정하며,
따라서 big-endian 아키텍쳐에서는 byte-swapping 오퍼레이션을 수행합니다.
===================================

1
Documentation/userspace-api/index.rst
View File

@ -21,6 +21,7 @@ place where this information is gathered.
unshare
spec_ctrl
accelerators/ocxl
ioctl/index
.. only:: subproject and html

0
Documentation/ioctl/cdrom.rst → Documentation/userspace-api/ioctl/cdrom.rst
View File

0
Documentation/ioctl/hdio.rst → Documentation/userspace-api/ioctl/hdio.rst
View File

1
Documentation/ioctl/index.rst → Documentation/userspace-api/ioctl/index.rst
View File

@ -9,7 +9,6 @@ IOCTLs
ioctl-number
botching-up-ioctls
ioctl-decoding
cdrom

0
Documentation/ioctl/ioctl-decoding.rst → Documentation/userspace-api/ioctl/ioctl-decoding.rst
View File

0
Documentation/ioctl/ioctl-number.rst → Documentation/userspace-api/ioctl/ioctl-number.rst
View File

2
Documentation/w1/index.rst
View File

@ -1,4 +1,4 @@
. SPDX-License-Identifier: GPL-2.0
.. SPDX-License-Identifier: GPL-2.0
================
1-Wire Subsystem

88
MAINTAINERS
View File

@ -1,12 +1,14 @@
List of maintainers and how to submit kernel changes
List of maintainers and how to submit kernel changes
====================================================
Please try to follow the guidelines below. This will make things
easier on the maintainers. Not all of these guidelines matter for every
trivial patch so apply some common sense.
1. Always _test_ your changes, however small, on at least 4 or
Tips for patch submitters
-------------------------
1. Always *test* your changes, however small, on at least 4 or
5 people, preferably many more.
2. Try to release a few ALPHA test versions to the net. Announce
@ -25,7 +27,7 @@ trivial patch so apply some common sense.
testing and await feedback.
5. Make a patch available to the relevant maintainer in the list. Use
'diff -u' to make the patch easy to merge. Be prepared to get your
``diff -u`` to make the patch easy to merge. Be prepared to get your
changes sent back with seemingly silly requests about formatting
and variable names. These aren't as silly as they seem. One
job the maintainers (and especially Linus) do is to keep things
@ -38,7 +40,7 @@ trivial patch so apply some common sense.
See Documentation/process/coding-style.rst for guidance here.
PLEASE CC: the maintainers and mailing lists that are generated
by scripts/get_maintainer.pl. The results returned by the
by ``scripts/get_maintainer.pl.`` The results returned by the
script will be best if you have git installed and are making
your changes in a branch derived from Linus' latest git tree.
See Documentation/process/submitting-patches.rst for details.
@ -70,26 +72,27 @@ trivial patch so apply some common sense.
not represent an immediate threat and are better handled publicly,
and ideally, should come with a patch proposal. Please do not send
automated reports to this list either. Such bugs will be handled
better and faster in the usual public places.
better and faster in the usual public places. See
Documentation/admin-guide/security-bugs.rst for details.
8. Happy hacking.
Descriptions of section entries:
Descriptions of section entries
-------------------------------
P: Person (obsolete)
M: Mail patches to: FullName <address@domain>
R: Designated reviewer: FullName <address@domain>
M: *Mail* patches to: FullName <address@domain>
R: Designated *Reviewer*: FullName <address@domain>
These reviewers should be CCed on patches.
L: Mailing list that is relevant to this area
W: Web-page with status/info
B: URI for where to file bugs. A web-page with detailed bug
L: *Mailing list* that is relevant to this area
W: *Web-page* with status/info
B: URI for where to file *bugs*. A web-page with detailed bug
filing info, a direct bug tracker link, or a mailto: URI.
C: URI for chat protocol, server and channel where developers
C: URI for *chat* protocol, server and channel where developers
usually hang out, for example irc://server/channel.
Q: Patchwork web based patch tracking system site
T: SCM tree type and location.
Q: *Patchwork* web based patch tracking system site
T: *SCM* tree type and location.
Type is one of: git, hg, quilt, stgit, topgit
S: Status, one of the following:
S: *Status*, one of the following:
Supported: Someone is actually paid to look after this.
Maintained: Someone actually looks after it.
Odd Fixes: It has a maintainer but they don't have time to do
@ -99,13 +102,17 @@ Descriptions of section entries:
Obsolete: Old code. Something tagged obsolete generally means
it has been replaced by a better system and you
should be using that.
F: Files and directories with wildcard patterns.
P: Subsystem Profile document for more details submitting
patches to the given subsystem. This is either an in-tree file,
or a URI. See Documentation/maintainer/maintainer-entry-profile.rst
for details.
F: *Files* and directories wildcard patterns.
A trailing slash includes all files and subdirectory files.
F: drivers/net/ all files in and below drivers/net
F: drivers/net/* all files in drivers/net, but not below
F: */net/* all files in "any top level directory"/net
One pattern per line. Multiple F: lines acceptable.
N: Files and directories with regex patterns.
N: Files and directories *Regex* patterns.
N: [^a-z]tegra all files whose path contains the word tegra
One pattern per line. Multiple N: lines acceptable.
scripts/get_maintainer.pl has different behavior for files that
@ -113,14 +120,14 @@ Descriptions of section entries:
get_maintainer will not look at git log history when an F: pattern
match occurs. When an N: match occurs, git log history is used
to also notify the people that have git commit signatures.
X: Files and directories that are NOT maintained, same rules as F:
Files exclusions are tested before file matches.
X: *Excluded* files and directories that are NOT maintained, same
rules as F:. Files exclusions are tested before file matches.
Can be useful for excluding a specific subdirectory, for instance:
F: net/
X: net/ipv6/
matches all files in and below net excluding net/ipv6/
K: Keyword perl extended regex pattern to match content in a
patch or file. For instance:
K: *Content regex* (perl extended) pattern match in a patch or file.
For instance:
K: of_get_profile
matches patches or files that contain "of_get_profile"
K: \b(printk|pr_(info|err))\b
@ -128,13 +135,12 @@ Descriptions of section entries:
printk, pr_info or pr_err
One regex pattern per line. Multiple K: lines acceptable.
Note: For the hard of thinking, this list is meant to remain in alphabetical
order. If you could add yourselves to it in alphabetical order that would be
so much easier [Ed]
Maintainers List
----------------
Maintainers List (try to look for most precise areas first)
-----------------------------------
.. note:: When reading this list, please look for the most precise areas
first. When adding to this list, please keep the entries in
alphabetical order.
3C59X NETWORK DRIVER
M: Steffen Klassert <klassert@kernel.org>
@ -817,7 +823,7 @@ S: Orphan
F: drivers/usb/gadget/udc/amd5536udc.*
AMD GEODE PROCESSOR/CHIPSET SUPPORT
P: Andres Salomon <dilinger@queued.net>
M: Andres Salomon <dilinger@queued.net>
L: linux-geode@lists.infradead.org (moderated for non-subscribers)
W: http://www.amd.com/us-en/ConnectivitySolutions/TechnicalResources/0,,50_2334_2452_11363,00.html
S: Supported
@ -1640,8 +1646,7 @@ R: Suzuki K Poulose <suzuki.poulose@arm.com>
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
S: Maintained
F: drivers/hwtracing/coresight/*
F: Documentation/trace/coresight.rst
F: Documentation/trace/coresight-cpu-debug.rst
F: Documentation/trace/coresight/*
F: Documentation/devicetree/bindings/arm/coresight.txt
F: Documentation/devicetree/bindings/arm/coresight-cpu-debug.txt
F: Documentation/ABI/testing/sysfs-bus-coresight-devices-*
@ -3709,7 +3714,7 @@ M: Oleksij Rempel <o.rempel@pengutronix.de>
R: Pengutronix Kernel Team <kernel@pengutronix.de>
L: linux-can@vger.kernel.org
S: Maintained
F: Documentation/networking/j1939.txt
F: Documentation/networking/j1939.rst
F: net/can/j1939/
F: include/uapi/linux/can/j1939.h
@ -9401,6 +9406,7 @@ M: Dan Williams <dan.j.williams@intel.com>
M: Vishal Verma <vishal.l.verma@intel.com>
M: Dave Jiang <dave.jiang@intel.com>
L: linux-nvdimm@lists.01.org
P: Documentation/nvdimm/maintainer-entry-profile.rst
Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
S: Supported
F: drivers/nvdimm/blk.c
@ -9411,6 +9417,7 @@ M: Vishal Verma <vishal.l.verma@intel.com>
M: Dan Williams <dan.j.williams@intel.com>
M: Dave Jiang <dave.jiang@intel.com>
L: linux-nvdimm@lists.01.org
P: Documentation/nvdimm/maintainer-entry-profile.rst
Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
S: Supported
F: drivers/nvdimm/btt*
@ -9420,6 +9427,7 @@ M: Dan Williams <dan.j.williams@intel.com>
M: Vishal Verma <vishal.l.verma@intel.com>
M: Dave Jiang <dave.jiang@intel.com>
L: linux-nvdimm@lists.01.org
P: Documentation/nvdimm/maintainer-entry-profile.rst
Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
S: Supported
F: drivers/nvdimm/pmem*
@ -9438,6 +9446,7 @@ M: Vishal Verma <vishal.l.verma@intel.com>
M: Dave Jiang <dave.jiang@intel.com>
M: Ira Weiny <ira.weiny@intel.com>
L: linux-nvdimm@lists.01.org
P: Documentation/nvdimm/maintainer-entry-profile.rst
Q: https://patchwork.kernel.org/project/linux-nvdimm/list/
T: git git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm.git
S: Supported
@ -10337,7 +10346,6 @@ F: drivers/staging/media/tegra-vde/
MEDIA INPUT INFRASTRUCTURE (V4L/DVB)
M: Mauro Carvalho Chehab <mchehab@kernel.org>
P: LinuxTV.org Project
L: linux-media@vger.kernel.org
W: https://linuxtv.org
Q: http://patchwork.kernel.org/project/linux-media/list/
@ -13772,7 +13780,6 @@ S: Maintained
F: arch/mips/ralink
RALINK RT2X00 WIRELESS LAN DRIVER
P: rt2x00 project
M: Stanislaw Gruszka <sgruszka@redhat.com>
M: Helmut Schaa <helmut.schaa@googlemail.com>
L: linux-wireless@vger.kernel.org
@ -14108,7 +14115,6 @@ S: Supported
F: drivers/net/ethernet/rocker/
ROCKETPORT DRIVER
P: Comtrol Corp.
W: http://www.comtrol.com
S: Maintained
F: Documentation/driver-api/serial/rocket.rst
@ -15016,15 +15022,13 @@ F: drivers/video/fbdev/simplefb.c
F: include/linux/platform_data/simplefb.h
SIMTEC EB110ATX (Chalice CATS)
P: Ben Dooks
P: Vincent Sanders <vince@simtec.co.uk>
M: Vincent Sanders <vince@simtec.co.uk>
M: Simtec Linux Team <linux@simtec.co.uk>
W: http://www.simtec.co.uk/products/EB110ATX/
S: Supported
SIMTEC EB2410ITX (BAST)
P: Ben Dooks
P: Vincent Sanders <vince@simtec.co.uk>
M: Vincent Sanders <vince@simtec.co.uk>
M: Simtec Linux Team <linux@simtec.co.uk>
W: http://www.simtec.co.uk/products/EB2410ITX/
S: Supported
@ -15739,7 +15743,7 @@ SUN4I LOW RES ADC ATTACHED TABLET KEYS DRIVER
M: Hans de Goede <hdegoede@redhat.com>
L: linux-input@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/input/sun4i-lradc-keys.txt
F: Documentation/devicetree/bindings/input/allwinner,sun4i-a10-lradc-keys.yaml
F: drivers/input/keyboard/sun4i-lradc-keys.c
SUNDANCE NETWORK DRIVER

2
drivers/net/ethernet/faraday/ftgmac100.c
View File

@ -1858,7 +1858,7 @@ static int ftgmac100_probe(struct platform_device *pdev)
}
/* Indicate that we support PAUSE frames (see comment in
* Documentation/networking/phy.txt)
* Documentation/networking/phy.rst)
*/
phy_support_asym_pause(phy);

4
drivers/net/ethernet/pensando/ionic/ionic_if.h
View File

@ -596,8 +596,8 @@ enum ionic_txq_desc_opcode {
* the @encap is set, the device will
* offload the outer header checksums using
* LCO (local checksum offload) (see
* Documentation/networking/checksum-
* offloads.txt for more info).
* Documentation/networking/checksum-offloads.rst
* for more info).
*
* IONIC_TXQ_DESC_OPCODE_CSUM_HW:
*

2
drivers/platform/x86/Kconfig
View File

@ -258,7 +258,7 @@ config DELL_RBU
DELL system. Note you need a Dell OpenManage or Dell Update package (DUP)
supporting application to communicate with the BIOS regarding the new
image for the image update to take effect.
See <file:Documentation/driver-api/dell_rbu.rst> for more details on the driver.
See <file:Documentation/admin-guide/dell_rbu.rst> for more details on the driver.
config FUJITSU_LAPTOP

2
drivers/platform/x86/dell_rbu.c
View File

@ -24,7 +24,7 @@
* on every time the packet data is written. This driver requires an
* application to break the BIOS image in to fixed sized packet chunks.
*
* See Documentation/driver-api/dell_rbu.rst for more info.
* See Documentation/admin-guide/dell_rbu.rst for more info.
*/
#include <linux/init.h>
#include <linux/module.h>

2
fs/cifs/cifsfs.c
View File

@ -1551,7 +1551,7 @@ init_cifs(void)
/*
* Consider in future setting limit!=0 maybe to min(num_of_cores - 1, 3)
* so that we don't launch too many worker threads but
* Documentation/workqueue.txt recommends setting it to 0
* Documentation/core-api/workqueue.rst recommends setting it to 0
*/
/* WQ_UNBOUND allows decrypt tasks to run on any CPU */

13
include/linux/interrupt.h
View File

@ -140,6 +140,19 @@ request_threaded_irq(unsigned int irq, irq_handler_t handler,
irq_handler_t thread_fn,
unsigned long flags, const char *name, void *dev);
/**
* request_irq - Add a handler for an interrupt line
* @irq: The interrupt line to allocate
* @handler: Function to be called when the IRQ occurs.
* Primary handler for threaded interrupts
* If NULL, the default primary handler is installed
* @flags: Handling flags
* @name: Name of the device generating this interrupt
* @dev: A cookie passed to the handler function
*
* This call allocates an interrupt and establishes a handler; see
* the documentation for request_threaded_irq() for details.
*/
static inline int __must_check
request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
const char *name, void *dev)

2
lib/genalloc.c
View File

@ -472,7 +472,7 @@ void *gen_pool_dma_zalloc_align(struct gen_pool *pool, size_t size,
EXPORT_SYMBOL(gen_pool_dma_zalloc_align);
/**
* gen_pool_free - free allocated special memory back to the pool
* gen_pool_free_owner - free allocated special memory back to the pool
* @pool: pool to free to
* @addr: starting address of memory to free back to pool
* @size: size in bytes of memory to free

66
scripts/jobserver-exec Executable file
View File

@ -0,0 +1,66 @@
#!/usr/bin/env python
# SPDX-License-Identifier: GPL-2.0+
#
# This determines how many parallel tasks "make" is expecting, as it is
# not exposed via an special variables, reserves them all, runs a subprocess
# with PARALLELISM environment variable set, and releases the jobs back again.
#
# https://www.gnu.org/software/make/manual/html_node/POSIX-Jobserver.html#POSIX-Jobserver
from __future__ import print_function
import os, sys, errno
import subprocess
# Extract and prepare jobserver file descriptors from envirnoment.
claim = 0
jobs = b""
try:
# Fetch the make environment options.
flags = os.environ['MAKEFLAGS']
# Look for "--jobserver=R,W"
# Note that GNU Make has used --jobserver-fds and --jobserver-auth
# so this handles all of them.
opts = [x for x in flags.split(" ") if x.startswith("--jobserver")]
# Parse out R,W file descriptor numbers and set them nonblocking.
fds = opts[0].split("=", 1)[1]
reader, writer = [int(x) for x in fds.split(",", 1)]
# Open a private copy of reader to avoid setting nonblocking
# on an unexpecting process with the same reader fd.
reader = os.open("/proc/self/fd/%d" % (reader),
os.O_RDONLY | os.O_NONBLOCK)
# Read out as many jobserver slots as possible.
while True:
try:
slot = os.read(reader, 8)
jobs += slot
except (OSError, IOError) as e:
if e.errno == errno.EWOULDBLOCK:
# Stop at the end of the jobserver queue.
break
# If something went wrong, give back the jobs.
if len(jobs):
os.write(writer, jobs)
raise e
# Add a bump for our caller's reserveration, since we're just going
# to sit here blocked on our child.
claim = len(jobs) + 1
except (KeyError, IndexError, ValueError, OSError, IOError) as e:
# Any missing environment strings or bad fds should result in just
# not being parallel.
pass
# We can only claim parallelism if there was a jobserver (i.e. a top-level
# "-jN" argument) and there were no other failures. Otherwise leave out the
# environment variable and let the child figure out what is best.
if claim > 0:
os.environ['PARALLELISM'] = '%d' % (claim)
rc = subprocess.call(sys.argv[1:])
# Return all the reserved slots.
if len(jobs):
os.write(writer, jobs)
sys.exit(rc)

27
scripts/kernel-doc
View File

@ -1062,7 +1062,7 @@ sub dump_struct($$) {
my $x = shift;
my $file = shift;
if ($x =~ /(struct|union)\s+(\w+)\s*\{(.*)\}(\s*(__packed|__aligned|__attribute__\s*\(\([a-z0-9,_\s\(\)]*\)\)))*/) {
if ($x =~ /(struct|union)\s+(\w+)\s*\{(.*)\}(\s*(__packed|__aligned|____cacheline_aligned_in_smp|__attribute__\s*\(\([a-z0-9,_\s\(\)]*\)\)))*/) {
my $decl_type = $1;
$declaration_name = $2;
my $members = $3;
@ -1073,10 +1073,11 @@ sub dump_struct($$) {
# strip comments:
$members =~ s/\/\*.*?\*\///gos;
# strip attributes
$members =~ s/\s*__attribute__\s*\(\([a-z0-9,_\*\s\(\)]*\)\)//gi;
$members =~ s/\s*__aligned\s*\([^;]*\)//gos;
$members =~ s/\s*__packed\s*//gos;
$members =~ s/\s*CRYPTO_MINALIGN_ATTR//gos;
$members =~ s/\s*__attribute__\s*\(\([a-z0-9,_\*\s\(\)]*\)\)/ /gi;
$members =~ s/\s*__aligned\s*\([^;]*\)/ /gos;
$members =~ s/\s*__packed\s*/ /gos;
$members =~ s/\s*CRYPTO_MINALIGN_ATTR/ /gos;
$members =~ s/\s*____cacheline_aligned_in_smp/ /gos;
# replace DECLARE_BITMAP
$members =~ s/DECLARE_BITMAP\s*\(([^,)]+),\s*([^,)]+)\)/unsigned long $1\[BITS_TO_LONGS($2)\]/gos;
# replace DECLARE_HASHTABLE
@ -1449,6 +1450,10 @@ sub push_parameter($$$$) {
# handles unnamed variable parameters
$param = "...";
}
elsif ($param =~ /\w\.\.\.$/) {
# for named variable parameters of the form `x...`, remove the dots
$param =~ s/\.\.\.$//;
}
if (!defined $parameterdescs{$param} || $parameterdescs{$param} eq "") {
$parameterdescs{$param} = "variable arguments";
}
@ -1936,6 +1941,18 @@ sub process_name($$) {
sub process_body($$) {
my $file = shift;
# Until all named variable macro parameters are
# documented using the bare name (`x`) rather than with
# dots (`x...`), strip the dots:
if ($section =~ /\w\.\.\.$/) {
$section =~ s/\.\.\.$//;
if ($verbose) {
print STDERR "${file}:$.: warning: Variable macro arguments should be documented without dots\n";
++$warnings;
}
}
if (/$doc_sect/i) { # case insensitive for supported section names
$newsection = $1;
$newcontents = $2;

30
scripts/sphinx-pre-install
View File

@ -124,11 +124,13 @@ sub add_package($$)
sub check_missing_file($$$)
{
my $file = shift;
my $files = shift;
my $package = shift;
my $is_optional = shift;
return if(-e $file);
for (@$files) {
return if(-e $_);
}
add_package($package, $is_optional);
}
@ -343,10 +345,11 @@ sub give_debian_hints()
);
if ($pdf) {
check_missing_file("/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf",
check_missing_file(["/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf"],
"fonts-dejavu", 2);
check_missing_file("/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc",
check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc",
"/usr/share/fonts/opentype/noto/NotoSerifCJK-Regular.ttc"],
"fonts-noto-cjk", 2);
}
@ -413,7 +416,7 @@ sub give_redhat_hints()
}
if ($pdf) {
check_missing_file("/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc",
check_missing_file(["/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc"],
"google-noto-sans-cjk-ttc-fonts", 2);
}
@ -498,7 +501,7 @@ sub give_mageia_hints()
$map{"latexmk"} = "texlive-collection-basic";
if ($pdf) {
check_missing_file("/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc",
check_missing_file(["/usr/share/fonts/google-noto-cjk/NotoSansCJK-Regular.ttc"],
"google-noto-sans-cjk-ttc-fonts", 2);
}
@ -517,6 +520,7 @@ sub give_arch_linux_hints()
"dot" => "graphviz",
"convert" => "imagemagick",
"xelatex" => "texlive-bin",
"latexmk" => "texlive-core",
"rsvg-convert" => "extra/librsvg",
);
@ -528,7 +532,7 @@ sub give_arch_linux_hints()
check_pacman_missing(\@archlinux_tex_pkgs, 2) if ($pdf);
if ($pdf) {
check_missing_file("/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc",
check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJK-Regular.ttc"],
"noto-fonts-cjk", 2);
}
@ -549,11 +553,11 @@ sub give_gentoo_hints()
"rsvg-convert" => "gnome-base/librsvg",
);
check_missing_file("/usr/share/fonts/dejavu/DejaVuSans.ttf",
check_missing_file(["/usr/share/fonts/dejavu/DejaVuSans.ttf"],
"media-fonts/dejavu", 2) if ($pdf);
if ($pdf) {
check_missing_file("/usr/share/fonts/noto-cjk/NotoSansCJKsc-Regular.otf",
check_missing_file(["/usr/share/fonts/noto-cjk/NotoSansCJKsc-Regular.otf"],
"media-fonts/noto-cjk", 2);
}
@ -645,6 +649,12 @@ sub check_distros()
# Common dependencies
#
sub deactivate_help()
{
printf "\tIf you want to exit the virtualenv, you can use:\n";
printf "\tdeactivate\n";
}
sub check_needs()
{
# Check for needed programs/tools
@ -686,6 +696,7 @@ sub check_needs()
if ($need_sphinx && scalar @activates > 0 && $activates[0] ge $min_activate) {
printf "\nNeed to activate a compatible Sphinx version on virtualenv with:\n";
printf "\t. $activates[0]\n";
deactivate_help();
exit (1);
} else {
my $rec_activate = "$virtenv_dir/bin/activate";
@ -697,6 +708,7 @@ sub check_needs()
printf "\t$virtualenv $virtenv_dir\n";
printf "\t. $rec_activate\n";
printf "\tpip install -r $requirement_file\n";
deactivate_help();
$need++ if (!$rec_sphinx_upgrade);
}