52061 Commits

Author SHA1 Message Date
Paul E. McKenney
fa218f1cce clocksource: Limit number of CPUs checked for clock synchronization
Currently, if skew is detected on a clock marked CLOCK_SOURCE_VERIFY_PERCPU,
that clock is checked on all CPUs.  This is thorough, but might not be
what you want on a system with a few tens of CPUs, let alone a few hundred
of them.

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

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

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

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

Reported-by: Chris Mason <clm@fb.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Feng Tang <feng.tang@intel.com>
Link: https://lore.kernel.org/r/20210527190124.440372-1-paulmck@kernel.org
2021-06-22 16:53:16 +02:00
Bharata B Rao
b87cc116c7 KVM: PPC: Book3S HV: Add KVM_CAP_PPC_RPT_INVALIDATE capability
Now that we have H_RPT_INVALIDATE fully implemented, enable
support for the same via KVM_CAP_PPC_RPT_INVALIDATE KVM capability

Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210621085003.904767-6-bharata@linux.ibm.com
2021-06-22 23:38:28 +10:00
Steven Price
04c02c201d KVM: arm64: Document MTE capability and ioctl
A new capability (KVM_CAP_ARM_MTE) identifies that the kernel supports
granting a guest access to the tags, and provides a mechanism for the
VMM to enable it.

A new ioctl (KVM_ARM_MTE_COPY_TAGS) provides a simple way for a VMM to
access the tags of a guest without having to maintain a PROT_MTE mapping
in userspace. The above capability gates access to the ioctl.

Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210621111716.37157-7-steven.price@arm.com
2021-06-22 14:08:07 +01:00
Sebastian Reichel
d90609a4b7
spi: dt-bindings: support devices with multiple chipselects
Add binding support for devices, that have more than one
chip select. A typical example are SPI connected microcontroller,
that can also be programmed over SPI like NXP Kinetis or
chips with a configuration and a data chip select, such as
Microchip's MRF89XA transceiver.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20210621175359.126729-3-sebastian.reichel@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-06-22 12:55:00 +01:00
Mark Brown
d1c02a7451
Merge series "regulator: qcom,rpmh-regulator: Add support for pmic available on SA8155p-adp board" from Bhupesh Sharma <bhupesh.sharma@linaro.org>:
Changes since v2:
-----------------
- v2 series can be found here: https://lore.kernel.org/linux-arm-msm/20210615074543.26700-1-bhupesh.sharma@linaro.org/T/#m8303d27d561b30133992da88198abb78ea833e21
- Addressed review comments from Bjorn and Mark.
- As per suggestion from Bjorn, seperated the patches in different
  patchsets (specific to each subsystem) to ease review and patch application.

Changes since v1:
-----------------
- v1 series can be found here: https://lore.kernel.org/linux-arm-msm/20210607113840.15435-1-bhupesh.sharma@linaro.org/T/#mc524fe82798d4c4fb75dd0333318955e0406ad18
- Addressed review comments from Bjorn and Vinod received on the v1
  series.

This series adds the regulator support code for SA8155p-adp board
which is based on Qualcomm snapdragon sa8155p SoC which in turn is
simiar to the sm8150 SoC.

This board supports a new PMIC PMM8155AU.

While at it, also make some cosmetic changes to the regulator driver
and dt-bindings to make sure the compatibles are alphabetical and also
fix issues with extra comma(s) at the end of terminator line(s).

Cc: Mark Brown <broonie@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>

Bhupesh Sharma (5):
  dt-bindings: regulator: qcom,rpmh-regulator: Arrange compatibles
    alphabetically
  dt-bindings: regulator: qcom,rpmh-regulator: Add compatible for
    SA8155p-adp board pmic
  regulator: qcom-rpmh: Cleanup terminator line commas
  regulator: qcom-rpmh: Add terminator at the end of pm7325x_vreg_data[]
    array
  regulator: qcom-rpmh: Add new regulator found on SA8155p adp board

 .../regulator/qcom,rpmh-regulator.yaml        | 17 ++---
 drivers/regulator/qcom-rpmh-regulator.c       | 62 +++++++++++++++----
 2 files changed, 59 insertions(+), 20 deletions(-)

--
2.31.1
2021-06-21 19:31:17 +01:00
Mark Brown
9d598cd737
Merge series "Extend regulator notification support" from Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>:
Extend regulator notification support

This series extends the regulator notification and error flag support.
Initial discussion on the topic can be found here:
https://lore.kernel.org/lkml/6046836e22b8252983f08d5621c35ececb97820d.camel@fi.rohmeurope.com/

In a nutshell - the series adds:

1. WARNING level events/error flags. (Patch 3)
  Current regulator 'ERROR' event notifications for over/under
  voltage, over current and over temperature are used to indicate
  condition where monitored entity is so badly "off" that it actually
  indicates a hardware error which can not be recovered. The most
  typical hanling for that is believed to be a (graceful)
  system-shutdown. Here we add set of 'WARNING' level flags to allow
  sending notifications to consumers before things are 'that badly off'
  so that consumer drivers can implement recovery-actions.
2. Device-tree properties for specifying limit values. (Patches 1, 5)
  Add limits for above mentioned 'ERROR' and 'WARNING' levels (which
  send notifications to consumers) and also for a 'PROTECTION' level
  (which will be used to immediately shut-down the regulator(s) W/O
  informing consumer drivers. Typically implemented by hardware).
  Property parsing is implemented in regulator core which then calls
  callback operations for limit setting from the IC drivers. A
  warning is emitted if protection is requested by device tree but the
  underlying IC does not support configuring requested protection.
3. Helpers which can be registered by IC. (Patch 4)
  Target is to avoid implementing IRQ handling and IRQ storm protection
  in each IC driver. (Many of the ICs implementin these IRQs do not allow
  masking or acking the IRQ but keep the IRQ asserted for the whole
  duration of problem keeping the processor in IRQ handling loop).
4. Emergency poweroff function (refactored out of the thermal_core to
  kernel/reboot.c) which is called if IC fires error IRQs but IC reading
  fails and given retry-count is exceeded. (Patches 2, 4)
  Please note that the mutex in the emergency shutdown was replaced by a
  simple atomic in order to allow call from any context.

The helper was attempted to be done so it could be used to implement
roughly same logic as is used in qcom-labibb regulator. This means
amongst other things a safety shut-down if IC registers are not readable.
Using these shut-down retry counters are optional. The idea is that the
helper could be also used by simpler ICs which do not provide status
register(s) which can be used to check if error is still active.

ICs which do not have such status register can simply omit the 'renable'
callback (and retry-counts etc) - and helper assumes the situation is Ok
and re-enables IRQ after given time period. If problem persists the
handler is ran again and another notification is sent - but at least the
delay allows processor to avoid IRQ loop.

Patch 7 takes this notification support in use at BD9576MUF.
Patch 8 is related to MFD change which is not really related to the RFC
here. It was added to this series in order to avoid potential conflicts.
Patch 9 adds a maintainers entry.

Changelog v10-RESEND:
   - rebased on v5.13-rc4
Changelog v10:
   - rebased on v5.13-rc2
   - Move rdev_*() print macros to the internal.h and use rdev_dbg()
     from irq_helpers.c
   - Export rdev_get_name() and move it from coupler.h to driver.h for
     others to use. (It was already in coupler.h but not exported -
     usage was limited and coupler.h does not sound like optimal place
     as rdev_name is not only used by coupled regulators)
   - Send all regulator notifications from irq_helpers.c at one OR'd
     event for the sake of simplicity. For BD9576 this does not matter
     as it has own IRQ for each event case. Header defining events says
     they may be OR'd.
   - Change WARN() at protection shutdown to pr_emerg as suggested by
     Petr.
Changelog v9:
   - rebases on v5.13-rc1
   - Update thermal documentation
   - Fix regulator notification event number
Changelog v8:
   - split shutdown API adding and thermal core taking it in use to
     own patches.
   - replace the spinlock with atomic when ensuring the emergency
     shutdown is only called once.
Changelog v7:
  general:
   - rebased on v5.12-rc7
   - new patch for refactoring the hw-failure reboot logic out of
     thermal_core.c for others to use.
  notification helpers:
   - fix regulator error_flags query
   - grammar/typos
   - do not BUG() but attempt to shut-down the system
   - use BITS_PER_TYPE()

Changelog v6:
  Add MAINTAINERS entry
  Changes to IRQ notifiers
   - move devm functions to drivers/regulator/devres.c
   - drop irq validity check
   - use devm_add_action_or_reset()
   - fix styling issues
   - fix kerneldocs

Changelog v5:
   - Fix the badly formatted pr_emerg() call.

Changelog v4:
   - rebased on v5.12-rc6
   - dropped RFC
   - fix external FET DT-binding.
   - improve prints for cases when expecting HW failure.
   - styling and typos

Changelog v3:
  Regulator core:
   - Fix dangling pointer access at regulator_irq_helper()
  stpmic1_regulator:
   - fix function prototype (compile error)
  bd9576-regulator:
   - Update over current limits to what was given in new data-sheet
     (REV00K)
   - Allow over-current monitoring without external FET. Set limits to
     values given in data-sheet (REV00K).

Changelog v2:
  Generic:
  - rebase on v5.12-rc2 + BD9576 series
  - Split devm variant of delayed wq to own series
  Regulator framework:
  - Provide non devm variant of IRQ notification helpers
  - shorten dt-property names as suggested by Rob
  - unconditionally call map_event in IRQ handling and require it to be
    populated
  BD9576 regulators:
  - change the FET resistance property to micro-ohms
  - fix voltage computation in OC limit setting
2021-06-21 19:28:42 +01:00
Rafael J. Wysocki
6cbab787c8 Merge back cpufreq material for v5.14. 2021-06-21 18:32:42 +02:00
Matti Vaittinen
627793e4ca
regulator: bd9576 add FET ON-resistance for OCW
BD9576MUF provides over-current protection and detection. Current is
measured as voltage loss over external FET. Allow specifying FET's on
resistance so current monitoring limits can be converted to voltages.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/e5feb160d7e09f33fff5b88f1928c66a15c6680f.1622628334.git.matti.vaittinen@fi.rohmeurope.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-06-21 13:08:42 +01:00
Matti Vaittinen
db0aeb4f07
thermal: Use generic HW-protection shutdown API
The hardware shutdown function was exported from kernel/reboot for
other subsystems to use. Logic is copied from the thermal_core. The
protection mutex is replaced by an atomic_t to allow calls also from
an IRQ context. Also the WARN() was replaced by pr_emerg() based on
discussions here:
https://lore.kernel.org/lkml/YJuPwAZroVZ%2Fw633@alley/
and here:
https://lore.kernel.org/linux-iommu/20210331093104.383705-4-geert+renesas@glider.be/

Use the exported API instead of implementing own just for the
thermal_core.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/5531e89d9e710f5d10e7cdce3ee58957335b9e03.1622628333.git.matti.vaittinen@fi.rohmeurope.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-06-21 13:08:37 +01:00
Matti Vaittinen
673e851b7d
regulator: Add protection limit properties
Support specifying protection/error/warning limits for regulator
over current, over temperature and over/under voltage.

Most of the PMICs support only "protection" feature but few
setups do also support error/warning level indications.

On many ICs most of the protection limits can't actually be set.
But for example the ampere limit for over-current protection on ROHM
BD9576 can be configured - or feature can be completely disabled.

Provide limit setting for all protections/errors for the sake of
the completeness and do that using own properties for all so that
not all users would need to set all levels when only one or few are
supported.

Signed-off-by: Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/ae2c6056d5ed1334912d27e736d23c9151065433.1622628333.git.matti.vaittinen@fi.rohmeurope.com
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-06-21 13:08:27 +01:00
Sergey Larin
01c5741b82
regulator: Add MAX8893 bindings
Add Maxim MAX8893 PMIC device tree bindings. The example is also
provided.

Signed-off-by: Sergey Larin <cerg2010cerg2010@mail.ru>
Link: https://lore.kernel.org/r/20210618141607.884-2-cerg2010cerg2010@mail.ru
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-06-21 13:07:45 +01:00
Bhupesh Sharma
66376e1523
regulator: qcom,rpmh-regulator: Add compatible for SA8155p-adp board pmic
Add compatible string for pmm8155au pmic found on
the SA8155p-adp board.

Cc: Mark Brown <broonie@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210617051712.345372-3-bhupesh.sharma@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-06-21 13:07:29 +01:00
Bhupesh Sharma
85adaac269
regulator: qcom,rpmh-regulator: Arrange compatibles alphabetically
Arrange the compatibles inside qcom-rpmh regulator device tree
bindings alphabetically.

Cc: Mark Brown <broonie@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210617051712.345372-2-bhupesh.sharma@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
2021-06-21 13:07:28 +01:00
Linus Torvalds
d9403d307d RISC-V Fixes for 5.13-rc7
* A build fix to always build modules with the medany code model, as
   the module loader doesn't support medlow.
 * A Kconfig warning fix for the SiFive errata.
 * A pair of fixes that for regressions to the recent memory layout
   changes.
 * A fix for the FU740 device tree.
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Merge tag 'riscv-for-linus-5.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux

Pull RISC-V fixes from Palmer Dabbelt:

 - A build fix to always build modules with the 'medany' code model, as
   the module loader doesn't support 'medlow'.

 - A Kconfig warning fix for the SiFive errata.

 - A pair of fixes that for regressions to the recent memory layout
   changes.

 - A fix for the FU740 device tree.

* tag 'riscv-for-linus-5.13-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
  riscv: dts: fu740: fix cache-controller interrupts
  riscv: Ensure BPF_JIT_REGION_START aligned with PMD size
  riscv: kasan: Fix MODULES_VADDR evaluation due to local variables' name
  riscv: sifive: fix Kconfig errata warning
  riscv32: Use medany C model for modules
2021-06-19 08:45:34 -07:00
Jisheng Zhang
3a02764c37
riscv: Ensure BPF_JIT_REGION_START aligned with PMD size
Andreas reported commit fc8504765ec5 ("riscv: bpf: Avoid breaking W^X")
breaks booting with one kind of defconfig, I reproduced a kernel panic
with the defconfig:

[    0.138553] Unable to handle kernel paging request at virtual address ffffffff81201220
[    0.139159] Oops [#1]
[    0.139303] Modules linked in:
[    0.139601] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.0-rc5-default+ #1
[    0.139934] Hardware name: riscv-virtio,qemu (DT)
[    0.140193] epc : __memset+0xc4/0xfc
[    0.140416]  ra : skb_flow_dissector_init+0x1e/0x82
[    0.140609] epc : ffffffff8029806c ra : ffffffff8033be78 sp : ffffffe001647da0
[    0.140878]  gp : ffffffff81134b08 tp : ffffffe001654380 t0 : ffffffff81201158
[    0.141156]  t1 : 0000000000000002 t2 : 0000000000000154 s0 : ffffffe001647dd0
[    0.141424]  s1 : ffffffff80a43250 a0 : ffffffff81201220 a1 : 0000000000000000
[    0.141654]  a2 : 000000000000003c a3 : ffffffff81201258 a4 : 0000000000000064
[    0.141893]  a5 : ffffffff8029806c a6 : 0000000000000040 a7 : ffffffffffffffff
[    0.142126]  s2 : ffffffff81201220 s3 : 0000000000000009 s4 : ffffffff81135088
[    0.142353]  s5 : ffffffff81135038 s6 : ffffffff8080ce80 s7 : ffffffff80800438
[    0.142584]  s8 : ffffffff80bc6578 s9 : 0000000000000008 s10: ffffffff806000ac
[    0.142810]  s11: 0000000000000000 t3 : fffffffffffffffc t4 : 0000000000000000
[    0.143042]  t5 : 0000000000000155 t6 : 00000000000003ff
[    0.143220] status: 0000000000000120 badaddr: ffffffff81201220 cause: 000000000000000f
[    0.143560] [<ffffffff8029806c>] __memset+0xc4/0xfc
[    0.143859] [<ffffffff8061e984>] init_default_flow_dissectors+0x22/0x60
[    0.144092] [<ffffffff800010fc>] do_one_initcall+0x3e/0x168
[    0.144278] [<ffffffff80600df0>] kernel_init_freeable+0x1c8/0x224
[    0.144479] [<ffffffff804868a8>] kernel_init+0x12/0x110
[    0.144658] [<ffffffff800022de>] ret_from_exception+0x0/0xc
[    0.145124] ---[ end trace f1e9643daa46d591 ]---

After some investigation, I think I found the root cause: commit
2bfc6cd81bd ("move kernel mapping outside of linear mapping") moves
BPF JIT region after the kernel:

| #define BPF_JIT_REGION_START	PFN_ALIGN((unsigned long)&_end)

The &_end is unlikely aligned with PMD size, so the front bpf jit
region sits with part of kernel .data section in one PMD size mapping.
But kernel is mapped in PMD SIZE, when bpf_jit_binary_lock_ro() is
called to make the first bpf jit prog ROX, we will make part of kernel
.data section RO too, so when we write to, for example memset the
.data section, MMU will trigger a store page fault.

To fix the issue, we need to ensure the BPF JIT region is PMD size
aligned. This patch acchieve this goal by restoring the BPF JIT region
to original position, I.E the 128MB before kernel .text section. The
modification to kasan_init.c is inspired by Alexandre.

Fixes: fc8504765ec5 ("riscv: bpf: Avoid breaking W^X")
Reported-by: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
2021-06-18 21:10:05 -07:00
Fox Chen
8943474a41 docs: path-lookup: use bare function() rather than literals
As suggested by Matthew Wilcox and Jonathan Corbet, drop ``...``
literals around function names of this patchset.

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-14-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:08 -06:00
Fox Chen
ef4aa53f36 docs: path-lookup: update symlink description
instead of lookup_real()/vfs_create(), i_op->lookup() and
i_op->create() will be called directly.

update vfs_open() logic

should_follow_link is merged into lookup_last() or open_last_lookup()
which returns symlink name instead of an integer.

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-13-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:08 -06:00
Fox Chen
3c1be84b8d docs: path-lookup: update get_link() ->follow_link description
get_link() is merged into pick_link(). i_op->follow_link is
replaced with i_op->get_link(). get_link() can return ERR_PTR(0)
which equals NULL.

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-12-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:08 -06:00
Fox Chen
de9414adaf docs: path-lookup: update WALK_GET, WALK_PUT desc
WALK_GET is changed to WALK_TRAILING with a different meaning.
Here it should be WALK_NOFOLLOW. WALK_PUT dosn't exist, we have
WALK_MORE.

WALK_PUT == !WALK_MORE

And there is not should_follow_link().

Related commits:
commit 8c4efe22e7c4 ("namei: invert the meaning of WALK_FOLLOW")
commit 1c4ff1a87e46 ("namei: invert WALK_PUT logics")

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
[jc: applied language tweaks suggested by Neil]
Link: https://lore.kernel.org/r/20210527091618.287093-11-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:08 -06:00
Fox Chen
18edb95a88 docs: path-lookup: no get_link()
no get_link() anymore. we have step_into() and pick_link().

walk_component() will call step_into(), in turn call pick_link,
and return symlink name.

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-10-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:08 -06:00
Fox Chen
671f73356f docs: path-lookup: update i_op->put_link and cookie description
No inode->put_link operation anymore. We use delayed_call to
deal with link destruction. Cookie has been replaced with
struct delayed_call.

Related commit: commit fceef393a538 ("switch ->get_link() to
delayed_call, kill ->put_link()")

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-9-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:08 -06:00
Fox Chen
4a00e4bd59 docs: path-lookup: i_op->follow_link replaced with i_op->get_link
follow_link has been replaced by get_link() which can be
called in RCU mode.

see commit: commit 6b2553918d8b ("replace ->follow_link() with
new method that could stay in RCU mode")

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-8-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:08 -06:00
Fox Chen
d2d3dd5ecc docs: path-lookup: Add macro name to symlink limit description
Add macro name MAXSYMLINKS to the symlink limit description, so
that it is consistent with path name length description above.

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-7-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:08 -06:00
Fox Chen
34ef75ef25 docs: path-lookup: remove filename_mountpoint
No filename_mountpoint any more
see commit: commit 161aff1d93ab ("LOOKUP_MOUNTPOINT:
fold path_mountpointat() into path_lookupat()")

Without filename_mountpoint and path_mountpoint(), the
numbers should be four & three:

"These four correspond roughly to the three path_*() functions"

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-6-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:08 -06:00
Fox Chen
71e0a67dc6 docs: path-lookup: update do_last() part
traling_symlink() was merged into lookup_last, do_last().

do_last() has later been split into open_last_lookups()
and do_open().

see related commit: commit c5971b8c6354 ("take post-lookup
part of do_last() out of loop")

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-5-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:07 -06:00
Fox Chen
8593d2cc8c docs: path-lookup: update path_mountpoint() part
path_mountpoint() doesn't exist anymore. Have been folded
into path_lookup_at when flag is set with LOOKUP_MOUNTPOINT.
Check commit: commit 161aff1d93abf0e ("LOOKUP_MOUNTPOINT: fold
path_mountpointat() into path_lookupat()")

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-4-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:07 -06:00
Fox Chen
084c86837a docs: path-lookup: update path_to_nameidata() part
No path_to_namei() anymore, step_into() will be called.
Related commit: commit c99687a03a78 ("fold path_to_nameidata()
into its only remaining caller")

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-3-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:07 -06:00
Fox Chen
993b892610 docs: path-lookup: update follow_managed() part
No follow_managed() anymore, handle_mounts(),
traverse_mounts(), will do the job.
see commit 9deed3ebca24 ("new helper: traverse_mounts()")

Signed-off-by: Fox Chen <foxhlchen@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Link: https://lore.kernel.org/r/20210527091618.287093-2-foxhlchen@gmail.com
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:36:07 -06:00
Kees Cook
222a28edce docs: Makefile: Use CONFIG_SHELL not SHELL
Fix think-o about which variable to find the Kbuild-configured shell.
This has accidentally worked due to most shells setting $SHELL by
default.

Fixes: 51e46c7a4007 ("docs, parallelism: Rearrange how jobserver reservations are made")
Cc: stable@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210617225808.3907377-1-keescook@chromium.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-18 11:26:08 -06:00
Ingo Molnar
b2c0931a07 Merge branch 'sched/urgent' into sched/core, to resolve conflicts
This commit in sched/urgent moved the cfs_rq_is_decayed() function:

  a7b359fc6a37: ("sched/fair: Correctly insert cfs_rq's to list on unthrottle")

and this fresh commit in sched/core modified it in the old location:

  9e077b52d86a: ("sched/pelt: Check that *_avg are null when *_sum are")

Merge the two variants.

Conflicts:
	kernel/sched/fair.c

Signed-off-by: Ingo Molnar <mingo@kernel.org>
2021-06-18 11:31:25 +02:00
Jonathan Corbet
102caec107 docs: Take a little noise out of the build process
Sphinx 3.0 works at this point (albeit slowly) so stop scaring people
with a loud warning.  We also don't need to babble about CJK support in the
LaTeX build.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:49:18 -06:00
Mauro Carvalho Chehab
0ffd643875 docs: x86: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/17c68b5f1d72488431c77c1de9f13683fe9f536c.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:39 -06:00
Mauro Carvalho Chehab
c6c032bf2c docs: virt: kvm: s390-pv-boot.rst: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/8c0fc6578ff6384580fd0d622f363bbbd4fe91da.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:39 -06:00
Mauro Carvalho Chehab
69fe554015 docs: userspace-api: landlock.rst: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/24888a9c5da3c505b2bc274fcd83be348dbaf972.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:39 -06:00
Mauro Carvalho Chehab
81a2d57873 docs: trace: ftrace.rst: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/cf9b03ff4b7917d9846503f198372bc6b821445b.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:39 -06:00
Mauro Carvalho Chehab
e480336c25 docs: trace: coresight: coresight.rst: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/c79be625f7c90468e13d5380f0e4e1c1ccfa2fc8.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:39 -06:00
Mauro Carvalho Chehab
d3122273bd docs: security: landlock.rst: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/9174021ef2c87f395a4cc0895a4b2f7fd97db626.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:39 -06:00
Mauro Carvalho Chehab
9912d0bb9d docs: process: submitting-patches.rst: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/d172ab629c3e32c8d27ed4b9d2a209933e2a7178.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:38 -06:00
Mauro Carvalho Chehab
bffbae6d19 docs: PCI: pci.rst: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/8697cf945390f6b45fefb4c5fe22ed1c8070e32e.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:38 -06:00
Mauro Carvalho Chehab
e5424f0aec docs: PCI: endpoint: pci-endpoint-cfs.rst: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/4b18febe4a4f030dd9d43e5e6a2a0aa28bd5b734.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:38 -06:00
Mauro Carvalho Chehab
8d4a0adc9c docs: networking: devlink: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/4553858bc9a5442eba6d71caff8047e84ece4d9b.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:38 -06:00
Mauro Carvalho Chehab
7f3f7bfbbe docs: kernel-hacking: hacking.rst: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/9537b74d897fab13552535d79337060a3b241b8c.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:38 -06:00
Mauro Carvalho Chehab
25edd3a162 docs: i2c: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Acked-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/569722e3f7d73d746c145ea78d2b4fbe5defee90.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:38 -06:00
Mauro Carvalho Chehab
4d361d6cc7 docs: firmware-guide: acpi: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Reviewed-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Link: https://lore.kernel.org/r/7162043c18f1ea96c446b332400e44e8087ba142.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:38 -06:00
Mauro Carvalho Chehab
ab8e8da694 docs: driver-api: usb: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/2cd2dc3e6bacde587aeb09a3951594cfb0102014.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:38 -06:00
Mauro Carvalho Chehab
bbbaf2264d docs: driver-api: surface_aggregator: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Acked-by: Maximilian Luz <luzmaximilian@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/6097027b4de4c9015485cb73b297b98660c4296d.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:38 -06:00
Mauro Carvalho Chehab
85aa9afd7b docs: driver-api: gpio: using-gpio.rst: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/506a41353937c455c2e79b5960b0976edc8aa9e9.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:37 -06:00
Mauro Carvalho Chehab
29602b7c1e docs: driver-api: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/095b04bff6d49b4097382398bb91102eaa3f0fd3.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:37 -06:00
Mauro Carvalho Chehab
fd88d2e598 docs: doc-guide: avoid using ReST :doc:foo markup
The :doc:`foo` tag is auto-generated via automarkup.py.
So, use the filename at the sources, instead of :doc:`foo`.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/d6cbe5183406e3378ed4bd0f84f4bcf85a15009c.1623824363.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2021-06-17 13:24:37 -06:00