After commit 8341f2f2 ("sysrq: Use panic() to force a crash"),
a crash was not generated by dereferencing a NULL pointer anymore.

Let's update documentation as well to make it less misleading.
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Cc: Matthias Kaehlcke <mka@chromium.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Zefan Li <lizefan.x@bytedance.com>
Link: https://lore.kernel.org/r/20210309191550.3955601-1-hsiangkao@redhat.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

To declutter the top-level table of contents (the side bar), this
patch reduces the architecture-specfic documentation to one top-level
item, "CPU Architectures".
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20210312152804.2110703-1-j.neuschaefer@gmx.netSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Loadpin cmdline interface "enabled" has been renamed to "enforce"
for a long time, but the User Description Document was not updated.
(Meaning unchanged)

And kernel_read_file* were moved from linux/fs.h to its own
linux/kernel_read_file.h include file. So update that change here.
Signed-off-by: Jiele zhao <unclexiaole@gmail.com>
Link: https://lore.kernel.org/r/20210308020358.102836-1-unclexiaole@gmail.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Reword the subsystem bindings section to make sense, from a grammatical
point of view.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210309130650.2318419-1-geert+renesas@glider.beSigned-off-by: Jonathan Corbet <corbet@lwn.net>

BATCHED_UNMAP_TLB_FLUSH is used on x86 to do batched tlb shootdown by
sending one IPI to TLB flush all entries after unmapping pages rather
than sending an IPI to flush each individual entry.
On arm64, tlb shootdown is done by hardware. Flush instructions are
innershareable. The local flushes are limited to the boot (1 per CPU)
and when a task is getting a new ASID.
So marking this feature as "TODO" is not proper. ".." isn't good as
well. So this patch adds a "N/A" for this kind of features which are
not needed on some architectures.
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Acked-by: Will Deacon <will@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210223003230.11976-1-song.bao.hua@hisilicon.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Just put in the relevant file names and let automarkup handle the rest.

Fixes: 550c8399 ("docs/zh_CN: Add zh_CN/admin-guide/README.rst")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

s/overcommited/overcommitted/
s/Overcommiting/Overcommitting/
Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210313061029.28024-1-unixbhaskar@gmail.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

s/varibles/variables/

...and remove leading spaces from a sentence.
Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Acked-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20210305100923.3731-1-unixbhaskar@gmail.com
[jc: performed suggested prepositional tweak]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>

We've missed a few documentation when adding new VM_* flags.  Add the missing
pieces so they'll be in sync now.
Signed-off-by: Peter Xu <peterx@redhat.com>
Link: https://lore.kernel.org/r/20210302000646.432358-1-peterx@redhat.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Changeset f546ff0c ("Move our minimum Sphinx version to 1.7")
cleaned up some compatibility issues with previous Sphinx
versions, but it also dropped the PDF margin sets.

Without that, the media documentation won't build fine, as
the margins are too wide to display texts with monospaced
fonts.

While here, align the  "latex_elements = {" values, and add
a few other sphinxsetup configs in order to allow Sphinx to
wrap long lines on literal blocks.

Fixes: f546ff0c ("Move our minimum Sphinx version to 1.7")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

 Documentation/conf.py | 31 +++++++++++++++++++------------
 1 file changed, 19 insertions(+), 12 deletions(-)
Link: https://lore.kernel.org/r/911fbac185dd09c7df715cf4153361b81f04b7ad.1614787053.git.mchehab+huawei@kernel.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

X86 isn't the only architecture supporting NUMA_BALANCING. ARM64, PPC,
S390 and RISCV also support it:

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

On the other hand, setup_numabalancing() is implemented in mm/mempolicy.c
which doesn't depend on architectures.
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Acked-by: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210302084159.33688-1-song.bao.hua@hisilicon.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20210301214722.2310911-1-j.neuschaefer@gmx.netSigned-off-by: Jonathan Corbet <corbet@lwn.net>

This patch translates Documentation/riscv/index.rst into Chinese.
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210228191054.6048-5-siyanteng@loongson.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

This patch translates Documentation/riscv/pmu.rst into Chinese.
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210228191054.6048-4-siyanteng@loongson.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

This patch translates Documentation/riscv/patch-acceptance.rst into Chineae.
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210228191054.6048-3-siyanteng@loongson.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

This patch translates Documentation/riscv/boot-image-header.rst intoChinese.
Signed-off-by: Yanteng Si <siyanteng@loongson.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210228191054.6048-2-siyanteng@loongson.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Fix a typo (supportinf -> supporting).
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20210302223523.20130-9-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Drop a repeated word.
Fix punctuation of "eg." to "e.g."
Fix punctuation of "ie" to "i.e."
Add hyphentation to non-zero.
Capitalize PM (for Power Management).
Capitalize ID (for Identifier).
Change "," in a run-on sentence to ";".
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20210302223523.20130-8-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Add 'ledstate' to the keyboard_notifier_param struct info and tell
which header file contains that struct.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20210302223523.20130-7-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Correct hyphenation, spelling, and capitalization.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Henrik Rydberg <rydberg@bitmath.org>
Link: https://lore.kernel.org/r/20210302223523.20130-6-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Use "E.g." instead of "Eg.".
Use correct index for buttons[] array.
Update all of struct gameport's descriptions.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20210302223523.20130-5-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Change other related documentation file names from .txt to .rst
and be more explicit about their paths/locations.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Cc: Johann Deneux <johann.deneux@gmail.com>
Cc: Anssi Hannula <anssi.hannula@gmail.com>
Link: https://lore.kernel.org/r/20210302223523.20130-4-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Fix hyphenation, typos, capitalization, and a referenced file name
(.txt -> .rst).
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20210302223523.20130-3-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Fix grammar, punctuation, and spelling.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Cc: linux-input@vger.kernel.org
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: linux-doc@vger.kernel.org
Link: https://lore.kernel.org/r/20210302223523.20130-2-rdunlap@infradead.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

When anonymous enums are used, the identifier is empty.

While, IMO, it should be avoided the usage of such enums,
adding support for it is not hard.

So, postpone the check for empty identifiers to happen
only at the dump phase.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/055ad57879f1b9381b90879e00f72fde1c3a5647.1614760910.git.mchehab+huawei@kernel.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

dynamic debug is "expecting pairs of match-spec <value>" so the example
for all files of which the paths include "usb" there is "file" missing.
Signed-off-by: Martin Kepplinger <martin.kepplinger@puri.sm>
Link: https://lore.kernel.org/r/20210303091646.773111-1-martin.kepplinger@puri.smSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Add a paragraph about the ATTRIBUTE_GROUPS() helper macro, and use it in
the example.  Retain the old description, as it is still useful in case
of multiple groups.  Change the names of the group(s) structures, to
match the ATTRIBUTE_GROUPS() macro.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20210303133845.3939403-3-geert+renesas@glider.beSigned-off-by: Jonathan Corbet <corbet@lwn.net>

bus.rst, driver.rst, and hwmon-kernel-api.rst refer to the
DEVICE_ATTR_* macros for devices, but device.rst does not mention them.

Add a paragraph about these helper macros, and use them in the examples.
Retain the old description, as it is still useful for less common values
of mode.  Change the names of the example "show" and "store" methods, to
match the expectations of the DEVICE_ATTR_* macros.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20210303133845.3939403-2-geert+renesas@glider.beSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Add translation zh_CN/admin-guide/unicode.rst, and link it to
zh_CN/admin-guide/index.rst while clean its todo entry.
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210304080148.GA16612@mipcSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Add translation zh_CN/admin-guide/README.rst, and link it to
zh_CN/admin-guide/index.rst while clean its todo entry.
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210304080131.GA16539@mipcSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Signed-off-by: hjh <huangjianghui@uniontech.com>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/20210304094556.5858-1-huangjianghui@uniontech.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Currently, kernel-doc warns for function prototype parsing on the
presence of attributes "__attribute_const__" and "__flatten" in the
definition.

There are 166 occurrences in ~70 files in the kernel tree for
"__attribute_const__" and 5 occurrences in 4 files for "__flatten".

Out of 166, there are 3 occurrences in three different files with
"__attribute_const__" and a preceding kernel-doc; and, 1 occurrence in
./mm/percpu.c for "__flatten" with a preceding kernel-doc. All other
occurrences have no preceding kernel-doc.

Add support for  "__attribute_const__" and "__flatten" attributes.

A quick evaluation by running 'kernel-doc -none' on kernel-tree reveals
that no additional warning or error has been added or removed by the fix.
Suggested-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Aditya Srivastava <yashsri421@gmail.com>
Link: https://lore.kernel.org/r/20210306113510.31023-1-yashsri421@gmail.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Improve language and grammar of zh_CN/process/8.Conclusion.rst
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/8311d04c5528442ecae241062fbb1a7eded0b4f6.1614920267.git.bobwxc@email.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Improve language and grammar of zh_CN/process/7.AdvancedTopics.rst
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/e1579cfc77eb0cc31fb7402e8742dbc364b9086e.1614920267.git.bobwxc@email.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Improve language and grammar of zh_CN/process/6.Followthrough.rst
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/2024bbd647208fcb1c8b3db036e6f492bbdb2464.1614920267.git.bobwxc@email.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Improve language and grammar of zh_CN/process/5.Posting.rst
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/e2e8e109c7709ebbed9f536cbe49f6f56f38d5bf.1614920267.git.bobwxc@email.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Improve language and grammar of zh_CN/process/4.Coding.rst
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/66d6ec99bdd0f41c91951d33eb0fa7c4748019a4.1614920267.git.bobwxc@email.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Improve language and grammar of zh_CN/process/3.Early-stage.rst
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/501394c36239abe67966529595e10fa1aea22cd0.1614920267.git.bobwxc@email.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Sync and improve language & grammar of zh_CN/process/2.Process.rst
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/526409b6a93af6d14e0bb14b630fced9a9ffe98d.1614920267.git.bobwxc@email.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Improve language and grammar of zh_CN/process/1.Intro.rst
Signed-off-by: Wu XiangCheng <bobwxc@email.cn>
Reviewed-by: Alex Shi <alex.shi@linux.alibaba.com>
Link: https://lore.kernel.org/r/ed025a9071811f354b53d4b6e8e1d0976b34f34a.1614920267.git.bobwxc@email.cnSigned-off-by: Jonathan Corbet <corbet@lwn.net>