Date: Mon, 13 May 2024 14:18:28 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Diederik de Haas <didi.debian@...ow.org>, Dwaipayan Ray
 <dwaipayanray1@...il.com>, Lukas Bulwahn <lukas.bulwahn@...il.com>
Cc: Joe Perches <joe@...ches.com>, Jonathan Corbet <corbet@....net>,
 linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, Diederik de Haas
 <didi.debian@...ow.org>
Subject: Re: [PATCH] docs: dev-tools: checkpatch: Add targets for checkpatch
 tags

On Mon, 13 May 2024, Diederik de Haas <didi.debian@...ow.org> wrote:
> Make the tags directly linkable by defining targets for them.
>
> Closes: https://lore.kernel.org/r/8090211.0vHzs8tI1a@bagend/
> Signed-off-by: Diederik de Haas <didi.debian@...ow.org>
> ---
>  Documentation/dev-tools/checkpatch.rst | 216 +++++++++++++++++++++++++
>  1 file changed, 216 insertions(+)
>
> diff --git a/Documentation/dev-tools/checkpatch.rst b/Documentation/dev-tools/checkpatch.rst
> index 127968995847..6499e29c3a19 100644
> --- a/Documentation/dev-tools/checkpatch.rst
> +++ b/Documentation/dev-tools/checkpatch.rst
> @@ -242,6 +242,8 @@ This section contains a description of all the message types in checkpatch.
>  Allocation style
>  ----------------
>  
> +  .. _alloc-array-args:
> +
>    **ALLOC_ARRAY_ARGS**

Alternatively, you could just convert the definition lists into section
titles to make them implicit hyperlink targets. The rst stays cleaner
and there's no manual updating.

BR,
Jani.

>      The first argument for kcalloc or kmalloc_array should be the
>      number of elements.  sizeof() as the first argument is generally
> @@ -249,6 +251,8 @@ Allocation style
>  
>      See: https://www.kernel.org/doc/html/latest/core-api/memory-allocation.html
>  
> +  .. _alloc-sizeof-struct:
> +
>    **ALLOC_SIZEOF_STRUCT**
>      The allocation style is bad.  In general for family of
>      allocation functions using sizeof() to get memory size,
> @@ -262,6 +266,8 @@ Allocation style
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#allocating-memory
>  
> +  .. _alloc-with-multiply:
> +
>    **ALLOC_WITH_MULTIPLY**
>      Prefer kmalloc_array/kcalloc over kmalloc/kzalloc with a
>      sizeof multiply.
> @@ -272,16 +278,22 @@ Allocation style
>  API usage
>  ---------
>  
> +  .. _arch-defines:
> +
>    **ARCH_DEFINES**
>      Architecture specific defines should be avoided wherever
>      possible.
>  
> +  .. _arch-include-linux:
> +
>    **ARCH_INCLUDE_LINUX**
>      Whenever asm/file.h is included and linux/file.h exists, a
>      conversion can be made when linux/file.h includes asm/file.h.
>      However this is not always the case (See signal.h).
>      This message type is emitted only for includes from arch/.
>  
> +  .. _avoid-bug:
> +
>    **AVOID_BUG**
>      BUG() or BUG_ON() should be avoided totally.
>      Use WARN() and WARN_ON() instead, and handle the "impossible"
> @@ -289,6 +301,8 @@ API usage
>  
>      See: https://www.kernel.org/doc/html/latest/process/deprecated.html#bug-and-bug-on
>  
> +  .. _consider-kstrto:
> +
>    **CONSIDER_KSTRTO**
>      The simple_strtol(), simple_strtoll(), simple_strtoul(), and
>      simple_strtoull() functions explicitly ignore overflows, which
> @@ -298,6 +312,8 @@ API usage
>  
>      See: https://www.kernel.org/doc/html/latest/process/deprecated.html#simple-strtol-simple-strtoll-simple-strtoul-simple-strtoull
>  
> +  .. _constant-conversion:
> +
>    **CONSTANT_CONVERSION**
>      Use of __constant_<foo> form is discouraged for the following functions::
>  
> @@ -334,6 +350,8 @@ API usage
>  
>      See: https://lore.kernel.org/lkml/1400106425.12666.6.camel@joe-AO725/
>  
> +  .. _deprecated-api:
> +
>    **DEPRECATED_API**
>      Usage of a deprecated RCU API is detected.  It is recommended to replace
>      old flavourful RCU APIs by their new vanilla-RCU counterparts.
> @@ -342,6 +360,8 @@ API usage
>  
>      See: https://www.kernel.org/doc/html/latest/RCU/whatisRCU.html#full-list-of-rcu-apis
>  
> +  .. _deprecated-variable:
> +
>    **DEPRECATED_VARIABLE**
>      EXTRA_{A,C,CPP,LD}FLAGS are deprecated and should be replaced by the new
>      flags added via commit f77bf01425b1 ("kbuild: introduce ccflags-y,
> @@ -360,6 +380,8 @@ API usage
>        2. https://lore.kernel.org/lkml/1313384834-24433-12-git-send-email-lacombar@gmail.com/
>        3. https://www.kernel.org/doc/html/latest/kbuild/makefiles.html#compilation-flags
>  
> +  .. _device-attr-functions:
> +
>    **DEVICE_ATTR_FUNCTIONS**
>      The function names used in DEVICE_ATTR is unusual.
>      Typically, the store and show functions are used with <attr>_store and
> @@ -374,6 +396,8 @@ API usage
>  
>      See: https://www.kernel.org/doc/html/latest/driver-api/driver-model/device.html#attributes
>  
> +  .. _device-attr-ro:
> +
>    **DEVICE_ATTR_RO**
>      The DEVICE_ATTR_RO(name) helper macro can be used instead of
>      DEVICE_ATTR(name, 0444, name_show, NULL);
> @@ -383,6 +407,8 @@ API usage
>  
>      See: https://www.kernel.org/doc/html/latest/driver-api/driver-model/device.html#attributes
>  
> +  .. _device-attr-rw:
> +
>    **DEVICE_ATTR_RW**
>      The DEVICE_ATTR_RW(name) helper macro can be used instead of
>      DEVICE_ATTR(name, 0644, name_show, name_store);
> @@ -392,6 +418,8 @@ API usage
>  
>      See: https://www.kernel.org/doc/html/latest/driver-api/driver-model/device.html#attributes
>  
> +  .. _device-attr-wo:
> +
>    **DEVICE_ATTR_WO**
>      The DEVICE_AATR_WO(name) helper macro can be used instead of
>      DEVICE_ATTR(name, 0200, NULL, name_store);
> @@ -401,6 +429,8 @@ API usage
>  
>      See: https://www.kernel.org/doc/html/latest/driver-api/driver-model/device.html#attributes
>  
> +  .. _duplicated-sysctl-const:
> +
>    **DUPLICATED_SYSCTL_CONST**
>      Commit d91bff3011cf ("proc/sysctl: add shared variables for range
>      check") added some shared const variables to be used instead of a local
> @@ -419,6 +449,8 @@ API usage
>        1. https://lore.kernel.org/lkml/20190430180111.10688-1-mcroce@redhat.com/
>        2. https://lore.kernel.org/lkml/20190531131422.14970-1-mcroce@redhat.com/
>  
> +  .. _enosys:
> +
>    **ENOSYS**
>      ENOSYS means that a nonexistent system call was called.
>      Earlier, it was wrongly used for things like invalid operations on
> @@ -426,15 +458,21 @@ API usage
>  
>      See: https://lore.kernel.org/lkml/5eb299021dec23c1a48fa7d9f2c8b794e967766d.1408730669.git.luto@amacapital.net/
>  
> +  .. _enotsupp:
> +
>    **ENOTSUPP**
>      ENOTSUPP is not a standard error code and should be avoided in new patches.
>      EOPNOTSUPP should be used instead.
>  
>      See: https://lore.kernel.org/netdev/20200510182252.GA411829@lunn.ch/
>  
> +  .. _export-symbol:
> +
>    **EXPORT_SYMBOL**
>      EXPORT_SYMBOL should immediately follow the symbol to be exported.
>  
> +  .. _in-atomic:
> +
>    **IN_ATOMIC**
>      in_atomic() is not for driver use so any such use is reported as an ERROR.
>      Also in_atomic() is often used to determine if sleeping is permitted,
> @@ -445,6 +483,8 @@ API usage
>  
>      See: https://lore.kernel.org/lkml/20080320201723.b87b3732.akpm@linux-foundation.org/
>  
> +  .. _lockdep:
> +
>    **LOCKDEP**
>      The lockdep_no_validate class was added as a temporary measure to
>      prevent warnings on conversion of device->sem to device->mutex.
> @@ -452,20 +492,28 @@ API usage
>  
>      See: https://lore.kernel.org/lkml/1268959062.9440.467.camel@laptop/
>  
> +  .. _malformed-include:
> +
>    **MALFORMED_INCLUDE**
>      The #include statement has a malformed path.  This has happened
>      because the author has included a double slash "//" in the pathname
>      accidentally.
>  
> +  .. _use-lockdep:
> +
>    **USE_LOCKDEP**
>      lockdep_assert_held() annotations should be preferred over
>      assertions based on spin_is_locked()
>  
>      See: https://www.kernel.org/doc/html/latest/locking/lockdep-design.html#annotations
>  
> +  .. _uapi-include:
> +
>    **UAPI_INCLUDE**
>      No #include statements in include/uapi should use a uapi/ path.
>  
> +  .. _usleep-range:
> +
>    **USLEEP_RANGE**
>      usleep_range() should be preferred over udelay(). The proper way of
>      using usleep_range() is mentioned in the kernel docs.
> @@ -476,6 +524,8 @@ API usage
>  Comments
>  --------
>  
> +  .. _block-comment-style:
> +
>    **BLOCK_COMMENT_STYLE**
>      The comment style is incorrect.  The preferred style for multi-
>      line comments is::
> @@ -500,12 +550,16 @@ Comments
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#commenting
>  
> +  .. _data-race:
> +
>    **DATA_RACE**
>      Applications of data_race() should have a comment so as to document the
>      reasoning behind why it was deemed safe.
>  
>      See: https://lore.kernel.org/lkml/20200401101714.44781-1-elver@google.com/
>  
> +  .. _fsf-mailing-address:
> +
>    **FSF_MAILING_ADDRESS**
>      Kernel maintainers reject new instances of the GPL boilerplate paragraph
>      directing people to write to the FSF for a copy of the GPL, since the
> @@ -519,12 +573,16 @@ Comments
>  Commit message
>  --------------
>  
> +  .. _bad-sign-off:
> +
>    **BAD_SIGN_OFF**
>      The signed-off-by line does not fall in line with the standards
>      specified by the community.
>  
>      See: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#developer-s-certificate-of-origin-1-1
>  
> +  .. _bad-stable-address-style:
> +
>    **BAD_STABLE_ADDRESS_STYLE**
>      The email format for stable is incorrect.
>      Some valid options for stable address are::
> @@ -536,17 +594,23 @@ Commit message
>  
>        stable@...r.kernel.org # version info
>  
> +  .. _commit-comment-symbol:
> +
>    **COMMIT_COMMENT_SYMBOL**
>      Commit log lines starting with a '#' are ignored by git as
>      comments.  To solve this problem addition of a single space
>      infront of the log line is enough.
>  
> +  .. _commit-message:
> +
>    **COMMIT_MESSAGE**
>      The patch is missing a commit description.  A brief
>      description of the changes made by the patch should be added.
>  
>      See: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
>  
> +  .. _email-subject:
> +
>    **EMAIL_SUBJECT**
>      Naming the tool that found the issue is not very useful in the
>      subject line.  A good subject line summarizes the change that
> @@ -554,6 +618,8 @@ Commit message
>  
>      See: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
>  
> +  .. _from-sign-off-mismatch:
> +
>    **FROM_SIGN_OFF_MISMATCH**
>      The author's email does not match with that in the Signed-off-by:
>      line(s). This can be sometimes caused due to an improperly configured
> @@ -566,6 +632,8 @@ Commit message
>        - The email subaddresses do not match.
>        - The email comments do not match.
>  
> +  .. _missing-sign-off:
> +
>    **MISSING_SIGN_OFF**
>      The patch is missing a Signed-off-by line.  A signed-off-by
>      line should be added according to Developer's certificate of
> @@ -573,6 +641,8 @@ Commit message
>  
>      See: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin
>  
> +  .. _no-author-sign-off:
> +
>    **NO_AUTHOR_SIGN_OFF**
>      The author of the patch has not signed off the patch.  It is
>      required that a simple sign off line should be present at the
> @@ -582,6 +652,8 @@ Commit message
>  
>      See: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin
>  
> +  .. _diff-in-commit-msg:
> +
>    **DIFF_IN_COMMIT_MSG**
>      Avoid having diff content in commit message.
>      This causes problems when one tries to apply a file containing both
> @@ -590,6 +662,8 @@ Commit message
>  
>      See: https://lore.kernel.org/lkml/20150611134006.9df79a893e3636019ad2759e@linux-foundation.org/
>  
> +  .. _gerrit-change-id:
> +
>    **GERRIT_CHANGE_ID**
>      To be picked up by gerrit, the footer of the commit message might
>      have a Change-Id like::
> @@ -599,6 +673,8 @@ Commit message
>  
>      The Change-Id line must be removed before submitting.
>  
> +  .. _git-commit-id:
> +
>    **GIT_COMMIT_ID**
>      The proper way to reference a commit id is:
>      commit <12+ chars of sha1> ("<title line>")
> @@ -612,6 +688,8 @@ Commit message
>  
>      See: https://www.kernel.org/doc/html/latest/process/submitting-patches.html#describe-your-changes
>  
> +  .. _bad-fixes-tag:
> +
>    **BAD_FIXES_TAG**
>      The Fixes: tag is malformed or does not follow the community conventions.
>      This can occur if the tag have been split into multiple lines (e.g., when
> @@ -623,6 +701,8 @@ Commit message
>  Comparison style
>  ----------------
>  
> +  .. _assign-in-if:
> +
>    **ASSIGN_IN_IF**
>      Do not use assignments in if condition.
>      Example::
> @@ -634,16 +714,22 @@ Comparison style
>        foo = bar(...);
>        if (foo < BAZ) {
>  
> +  .. _bool-comparison:
> +
>    **BOOL_COMPARISON**
>      Comparisons of A to true and false are better written
>      as A and !A.
>  
>      See: https://lore.kernel.org/lkml/1365563834.27174.12.camel@joe-AO722/
>  
> +  .. _comparison-to-null:
> +
>    **COMPARISON_TO_NULL**
>      Comparisons to NULL in the form (foo == NULL) or (foo != NULL)
>      are better written as (!foo) and (foo).
>  
> +  .. _constant-comparison:
> +
>    **CONSTANT_COMPARISON**
>      Comparisons with a constant or upper case identifier on the left
>      side of the test should be avoided.
> @@ -652,6 +738,8 @@ Comparison style
>  Indentation and Line Breaks
>  ---------------------------
>  
> +  .. _code-indent:
> +
>    **CODE_INDENT**
>      Code indent should use tabs instead of spaces.
>      Outside of comments, documentation and Kconfig,
> @@ -659,6 +747,8 @@ Indentation and Line Breaks
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#indentation
>  
> +  .. _deep-indentation:
> +
>    **DEEP_INDENTATION**
>      Indentation with 6 or more tabs usually indicate overly indented
>      code.
> @@ -668,6 +758,8 @@ Indentation and Line Breaks
>  
>      See: https://lore.kernel.org/lkml/1328311239.21255.24.camel@joe2Laptop/
>  
> +  .. _switch-case-indent-level:
> +
>    **SWITCH_CASE_INDENT_LEVEL**
>      switch should be at the same indent as case.
>      Example::
> @@ -691,6 +783,8 @@ Indentation and Line Breaks
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#indentation
>  
> +  .. _long-line:
> +
>    **LONG_LINE**
>      The line has exceeded the specified maximum length.
>      To use a different maximum line length, the --max-line-length=n option
> @@ -703,6 +797,8 @@ Indentation and Line Breaks
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#breaking-long-lines-and-strings
>  
> +  .. _long-line-string:
> +
>    **LONG_LINE_STRING**
>      A string starts before but extends beyond the maximum line length.
>      To use a different maximum line length, the --max-line-length=n option
> @@ -710,6 +806,8 @@ Indentation and Line Breaks
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#breaking-long-lines-and-strings
>  
> +  .. _long-line-comment:
> +
>    **LONG_LINE_COMMENT**
>      A comment starts before but extends beyond the maximum line length.
>      To use a different maximum line length, the --max-line-length=n option
> @@ -717,12 +815,16 @@ Indentation and Line Breaks
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#breaking-long-lines-and-strings
>  
> +  .. _split-string:
> +
>    **SPLIT_STRING**
>      Quoted strings that appear as messages in userspace and can be
>      grepped, should not be split across multiple lines.
>  
>      See: https://lore.kernel.org/lkml/20120203052727.GA15035@leaf/
>  
> +  .. _multiline-dereference:
> +
>    **MULTILINE_DEREFERENCE**
>      A single dereferencing identifier spanned on multiple lines like::
>  
> @@ -750,6 +852,8 @@ Indentation and Line Breaks
>      violation because it is much easier to read a dereferencing identifier
>      on a single line.
>  
> +  .. _trailing-statements:
> +
>    **TRAILING_STATEMENTS**
>      Trailing statements (for example after any conditional) should be
>      on the next line.
> @@ -766,6 +870,8 @@ Indentation and Line Breaks
>  Macros, Attributes and Symbols
>  ------------------------------
>  
> +  .. _array-size:
> +
>    **ARRAY_SIZE**
>      The ARRAY_SIZE(foo) macro should be preferred over
>      sizeof(foo)/sizeof(foo[0]) for finding number of elements in an
> @@ -775,10 +881,14 @@ Macros, Attributes and Symbols
>  
>        #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
>  
> +  .. _avoid-externs:
> +
>    **AVOID_EXTERNS**
>      Function prototypes don't need to be declared extern in .h
>      files.  It's assumed by the compiler and is unnecessary.
>  
> +  .. _avoid-l-prefix:
> +
>    **AVOID_L_PREFIX**
>      Local symbol names that are prefixed with `.L` should be avoided,
>      as this has special meaning for the assembler; a symbol entry will
> @@ -791,12 +901,16 @@ Macros, Attributes and Symbols
>      the beginning or end of code regions via
>      `SYM_CODE_START_LOCAL`/`SYM_CODE_END`
>  
> +  .. _bit-macro:
> +
>    **BIT_MACRO**
>      Defines like: 1 << <digit> could be BIT(digit).
>      The BIT() macro is defined via include/linux/bits.h::
>  
>        #define BIT(nr)         (1UL << (nr))
>  
> +  .. _const-read-mostly:
> +
>    **CONST_READ_MOSTLY**
>      When a variable is tagged with the __read_mostly annotation, it is a
>      signal to the compiler that accesses to the variable will be mostly
> @@ -805,6 +919,8 @@ Macros, Attributes and Symbols
>      const __read_mostly does not make any sense as const data is already
>      read-only.  The __read_mostly annotation thus should be removed.
>  
> +  .. _date-time:
> +
>    **DATE_TIME**
>      It is generally desirable that building the same source code with
>      the same set of tools is reproducible, i.e. the output is always
> @@ -816,6 +932,8 @@ Macros, Attributes and Symbols
>  
>      See: https://www.kernel.org/doc/html/latest/kbuild/reproducible-builds.html#timestamps
>  
> +  .. _define-arch-has:
> +
>    **DEFINE_ARCH_HAS**
>      The ARCH_HAS_xyz and ARCH_HAVE_xyz patterns are wrong.
>  
> @@ -827,9 +945,13 @@ Macros, Attributes and Symbols
>  
>      See: https://lore.kernel.org/lkml/CA+55aFycQ9XJvEOsiM3txHL5bjUc8CeKWJNR_H+MiicaddB42Q@mail.gmail.com/
>  
> +  .. _do-while-macro-with-trailing-semicolon:
> +
>    **DO_WHILE_MACRO_WITH_TRAILING_SEMICOLON**
>      do {} while(0) macros should not have a trailing semicolon.
>  
> +  .. _init-attribute:
> +
>    **INIT_ATTRIBUTE**
>      Const init definitions should use __initconst instead of
>      __initdata.
> @@ -837,6 +959,8 @@ Macros, Attributes and Symbols
>      Similarly init definitions without const require a separate
>      use of const.
>  
> +  .. _inline-location:
> +
>    **INLINE_LOCATION**
>      The inline keyword should sit between storage class and type.
>  
> @@ -854,6 +978,8 @@ Macros, Attributes and Symbols
>                ...
>        }
>  
> +  .. _misplaced-init:
> +
>    **MISPLACED_INIT**
>      It is possible to use section markers on variables in a way
>      which gcc doesn't understand (or at least not the way the
> @@ -868,6 +994,8 @@ Macros, Attributes and Symbols
>  
>      See: https://lore.kernel.org/lkml/1377655732.3619.19.camel@joe-AO722/
>  
> +  .. _multistatement-macro-use-do-while:
> +
>    **MULTISTATEMENT_MACRO_USE_DO_WHILE**
>      Macros with multiple statements should be enclosed in a
>      do - while block.  Same should also be the case for macros
> @@ -881,10 +1009,14 @@ Macros, Attributes and Symbols
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#macros-enums-and-rtl
>  
> +  .. _prefer-fallthrough:
> +
>    **PREFER_FALLTHROUGH**
>      Use the `fallthrough;` pseudo keyword instead of
>      `/* fallthrough */` like comments.
>  
> +  .. _trailing-semicolon:
> +
>    **TRAILING_SEMICOLON**
>      Macro definition should not end with a semicolon. The macro
>      invocation style should be consistent with function calls.
> @@ -906,6 +1038,8 @@ Macros, Attributes and Symbols
>  
>      See: https://lore.kernel.org/lkml/1399671106.2912.21.camel@joe-AO725/
>  
> +  .. _single-statement-do-while-macro:
> +
>    **SINGLE_STATEMENT_DO_WHILE_MACRO**
>      For the multi-statement macros, it is necessary to use the do-while
>      loop to avoid unpredictable code paths. The do-while loop helps to
> @@ -917,6 +1051,8 @@ Macros, Attributes and Symbols
>      the do-while loop is redundant. So remove the do-while loop for single
>      statement macros.
>  
> +  .. _weak-declaration:
> +
>    **WEAK_DECLARATION**
>      Using weak declarations like __attribute__((weak)) or __weak
>      can have unintended link defects.  Avoid using them.
> @@ -925,15 +1061,21 @@ Macros, Attributes and Symbols
>  Functions and Variables
>  -----------------------
>  
> +  .. _camelcase:
> +
>    **CAMELCASE**
>      Avoid CamelCase Identifiers.
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#naming
>  
> +  .. _const-const:
> +
>    **CONST_CONST**
>      Using `const <type> const *` is generally meant to be
>      written `const <type> * const`.
>  
> +  .. _const-struct:
> +
>    **CONST_STRUCT**
>      Using const is generally a good idea.  Checkpatch reads
>      a list of frequently used structs that are always or
> @@ -944,6 +1086,8 @@ Functions and Variables
>  
>      See: https://lore.kernel.org/lkml/alpine.DEB.2.10.1608281509480.3321@hadrien/
>  
> +  .. _embedded-function-name:
> +
>    **EMBEDDED_FUNCTION_NAME**
>      Embedded function names are less appropriate to use as
>      refactoring can cause function renaming.  Prefer the use of
> @@ -952,6 +1096,8 @@ Functions and Variables
>      Note that this does not work with -f (--file) checkpatch option
>      as it depends on patch context providing the function name.
>  
> +  .. _function-arguments:
> +
>    **FUNCTION_ARGUMENTS**
>      This warning is emitted due to any of the following reasons:
>  
> @@ -972,6 +1118,8 @@ Functions and Variables
>  
>           All arguments should have identifier names.
>  
> +  .. _function-without-args:
> +
>    **FUNCTION_WITHOUT_ARGS**
>      Function declarations without arguments like::
>  
> @@ -981,22 +1129,30 @@ Functions and Variables
>  
>        int foo(void)
>  
> +  .. _global-initialisers:
> +
>    **GLOBAL_INITIALISERS**
>      Global variables should not be initialized explicitly to
>      0 (or NULL, false, etc.).  Your compiler (or rather your
>      loader, which is responsible for zeroing out the relevant
>      sections) automatically does it for you.
>  
> +  .. _initialised-static:
> +
>    **INITIALISED_STATIC**
>      Static variables should not be initialized explicitly to zero.
>      Your compiler (or rather your loader) automatically does
>      it for you.
>  
> +  .. _multiple-assignments:
> +
>    **MULTIPLE_ASSIGNMENTS**
>      Multiple assignments on a single line makes the code unnecessarily
>      complicated. So on a single line assign value to a single variable
>      only, this makes the code more readable and helps avoid typos.
>  
> +  .. _return-parentheses:
> +
>    **RETURN_PARENTHESES**
>      return is not a function and as such doesn't need parentheses::
>  
> @@ -1010,6 +1166,8 @@ Functions and Variables
>  Permissions
>  -----------
>  
> +  .. _device-attr-perms:
> +
>    **DEVICE_ATTR_PERMS**
>      The permissions used in DEVICE_ATTR are unusual.
>      Typically only three permissions are used - 0644 (RW), 0444 (RO)
> @@ -1017,10 +1175,14 @@ Permissions
>  
>      See: https://www.kernel.org/doc/html/latest/filesystems/sysfs.html#attributes
>  
> +  .. _execute-permissions:
> +
>    **EXECUTE_PERMISSIONS**
>      There is no reason for source files to be executable.  The executable
>      bit can be removed safely.
>  
> +  .. _exported-world-writable:
> +
>    **EXPORTED_WORLD_WRITABLE**
>      Exporting world writable sysfs/debugfs files is usually a bad thing.
>      When done arbitrarily they can introduce serious security bugs.
> @@ -1030,10 +1192,14 @@ Permissions
>  
>      See: https://lore.kernel.org/linux-arm-kernel/cover.1296818921.git.segoon@openwall.com/
>  
> +  .. _non-octal-permissions:
> +
>    **NON_OCTAL_PERMISSIONS**
>      Permission bits should use 4 digit octal permissions (like 0700 or 0444).
>      Avoid using any other base like decimal.
>  
> +  .. _symbolic-perms:
> +
>    **SYMBOLIC_PERMS**
>      Permission bits in the octal form are more readable and easier to
>      understand than their symbolic counterparts because many command-line
> @@ -1049,10 +1215,14 @@ Permissions
>  Spacing and Brackets
>  --------------------
>  
> +  .. _assignment-continuations:
> +
>    **ASSIGNMENT_CONTINUATIONS**
>      Assignment operators should not be written at the start of a
>      line but should follow the operand at the previous line.
>  
> +  .. _braces:
> +
>    **BRACES**
>      The placement of braces is stylistically incorrect.
>      The preferred way is to put the opening brace last on the line,
> @@ -1073,6 +1243,8 @@ Spacing and Brackets
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#placing-braces-and-spaces
>  
> +  .. _bracket-space:
> +
>    **BRACKET_SPACE**
>      Whitespace before opening bracket '[' is prohibited.
>      There are some exceptions:
> @@ -1089,6 +1261,8 @@ Spacing and Brackets
>  
>          = { [0...10] = 5 }
>  
> +  .. _concatenated-string:
> +
>    **CONCATENATED_STRING**
>      Concatenated elements should have a space in between.
>      Example::
> @@ -1099,17 +1273,23 @@ Spacing and Brackets
>  
>        printk(KERN_INFO "bar");
>  
> +  .. _else-after-brace:
> +
>    **ELSE_AFTER_BRACE**
>      `else {` should follow the closing block `}` on the same line.
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#placing-braces-and-spaces
>  
> +  .. _line-spacing:
> +
>    **LINE_SPACING**
>      Vertical space is wasted given the limited number of lines an
>      editor window can display when multiple blank lines are used.
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#spaces
>  
> +  .. _open-brace:
> +
>    **OPEN_BRACE**
>      The opening brace should be following the function definitions on the
>      next line.  For any non-functional block it should be on the same line
> @@ -1117,6 +1297,8 @@ Spacing and Brackets
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#placing-braces-and-spaces
>  
> +  .. _pointer-location:
> +
>    **POINTER_LOCATION**
>      When using pointer data or a function that returns a pointer type,
>      the preferred use of * is adjacent to the data name or function name
> @@ -1129,11 +1311,15 @@ Spacing and Brackets
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#spaces
>  
> +  .. _spacing:
> +
>    **SPACING**
>      Whitespace style used in the kernel sources is described in kernel docs.
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#spaces
>  
> +  .. _trailing-whitespace:
> +
>    **TRAILING_WHITESPACE**
>      Trailing whitespace should always be removed.
>      Some editors highlight the trailing whitespace and cause visual
> @@ -1141,6 +1327,8 @@ Spacing and Brackets
>  
>      See: https://www.kernel.org/doc/html/latest/process/coding-style.html#spaces
>  
> +  .. _unnecessary-parentheses:
> +
>    **UNNECESSARY_PARENTHESES**
>      Parentheses are not required in the following cases:
>  
> @@ -1172,6 +1360,8 @@ Spacing and Brackets
>            &foo->bar
>            *foo->bar
>  
> +  .. _while-after-brace:
> +
>    **WHILE_AFTER_BRACE**
>      while should follow the closing bracket on the same line::
>  
> @@ -1185,19 +1375,27 @@ Spacing and Brackets
>  Others
>  ------
>  
> +  .. _config-description:
> +
>    **CONFIG_DESCRIPTION**
>      Kconfig symbols should have a help text which fully describes
>      it.
>  
> +  .. _corrupted-patch:
> +
>    **CORRUPTED_PATCH**
>      The patch seems to be corrupted or lines are wrapped.
>      Please regenerate the patch file before sending it to the maintainer.
>  
> +  .. _cvs-keyword:
> +
>    **CVS_KEYWORD**
>      Since linux moved to git, the CVS markers are no longer used.
>      So, CVS style keywords ($Id$, $Revision$, $Log$) should not be
>      added.
>  
> +  .. _default-no-break:
> +
>    **DEFAULT_NO_BREAK**
>      switch default case is sometimes written as "default:;".  This can
>      cause new cases added below default to be defective.
> @@ -1205,16 +1403,22 @@ Others
>      A "break;" should be added after empty default statement to avoid
>      unwanted fallthrough.
>  
> +  .. _dos-line-endings:
> +
>    **DOS_LINE_ENDINGS**
>      For DOS-formatted patches, there are extra ^M symbols at the end of
>      the line.  These should be removed.
>  
> +  .. _dt-schema-binding-patch:
> +
>    **DT_SCHEMA_BINDING_PATCH**
>      DT bindings moved to a json-schema based format instead of
>      freeform text.
>  
>      See: https://www.kernel.org/doc/html/latest/devicetree/bindings/writing-schema.html
>  
> +  .. _dt-split-binding-patch:
> +
>    **DT_SPLIT_BINDING_PATCH**
>      Devicetree bindings should be their own patch.  This is because
>      bindings are logically independent from a driver implementation,
> @@ -1224,20 +1428,28 @@ Others
>  
>      See: https://www.kernel.org/doc/html/latest/devicetree/bindings/submitting-patches.html#i-for-patch-submitters
>  
> +  .. _embedded-filename:
> +
>    **EMBEDDED_FILENAME**
>      Embedding the complete filename path inside the file isn't particularly
>      useful as often the path is moved around and becomes incorrect.
>  
> +  .. _file-path-changes:
> +
>    **FILE_PATH_CHANGES**
>      Whenever files are added, moved, or deleted, the MAINTAINERS file
>      patterns can be out of sync or outdated.
>  
>      So MAINTAINERS might need updating in these cases.
>  
> +  .. _memset:
> +
>    **MEMSET**
>      The memset use appears to be incorrect.  This may be caused due to
>      badly ordered parameters.  Please recheck the usage.
>  
> +  .. _not-unified-diff:
> +
>    **NOT_UNIFIED_DIFF**
>      The patch file does not appear to be in unified-diff format.  Please
>      regenerate the patch file before sending it to the maintainer.
> @@ -1245,6 +1457,8 @@ Others
>    **PRINTF_0XDECIMAL**
>      Prefixing 0x with decimal output is defective and should be corrected.
>  
> +  .. _spdx-license-tag:
> +
>    **SPDX_LICENSE_TAG**
>      The source file is missing or has an improper SPDX identifier tag.
>      The Linux kernel requires the precise SPDX identifier in all source files,
> @@ -1252,5 +1466,7 @@ Others
>  
>      See: https://www.kernel.org/doc/html/latest/process/license-rules.html
>  
> +  .. _typo-spelling:
> +
>    **TYPO_SPELLING**
>      Some words may have been misspelled.  Consider reviewing them.

-- 
Jani Nikula, Intel

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