Commit Graph

1381932 Commits

Author SHA1 Message Date
Mauro Carvalho Chehab
2bd22194b2 kernel-doc: output source file name at SEE ALSO
for man pages, it is helpful to know from where the man page
were generated.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <ac25496a27a0c90494a634d342207ef1ff6216e9.1759327966.git.mchehab+huawei@kernel.org>
2025-10-01 09:06:06 -06:00
Mauro Carvalho Chehab
0a4cd1c65e docs: Makefile: use PYTHONPYCACHEPREFIX
Previous cleanup patches ended dropping it when sphinx-build-wrapper
were added. Also, sphinx-pre-install can also generate caches.

So, re-add it for both.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <8c37576342994ea0e3466eec2602a8d989d9a5f0.1759328070.git.mchehab+huawei@kernel.org>
2025-10-01 08:51:10 -06:00
Mauro Carvalho Chehab
5401f971f5 tools/docs: sphinx-build-wrapper: pdflatex is needed only for pdf
Fix the logic which checks for pdflatex. Currently, it complains
for both pdfdocs and latexdocs, but for the latter, all it is
needed is Sphinx.

Reported-by: Akira Yokosawa <akiyks@gmail.com>
Closes: https://lore.kernel.org/linux-doc/cover.1758881658.git.mchehab+huawei@kernel.org/T/#ma81ff2e11b8579e5edc23e4381e464081ae668b7
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <313df7b4aab653e8fc40c30120c0dbebf8a0bcb1.1759328070.git.mchehab+huawei@kernel.org>
2025-10-01 08:51:10 -06:00
Mauro Carvalho Chehab
ff1354edb3 docs: Makefile: avoid a warning when using without texlive
As reported by Randy, running make htmldocs on a machine
without textlive now produce warnings:

    $ make O=DOCS htmldocs
    ../Documentation/Makefile:70: warning: overriding recipe for target 'pdfdocs'
    ../Documentation/Makefile:61: warning: ignoring old recipe for target 'pdfdocs'

That's because the code has now two definitions for pdfdocs in
case $PDFLATEX command is not found. With the new script, such
special case is not needed anymore, as the script checks it.

Drop the special case. Even after dropping it, on a machine
without LaTeX, it will still produce an error as expected,
as running:

    $ ./tools/docs/sphinx-build-wrapper pdfdocs
    Error: pdflatex or latexmk required for PDF generation

does the check. After applying the patch we have:

    $ make SPHINXDIRS=peci htmldocs
    Using alabaster theme
    Using Python kernel-doc

    $ make SPHINXDIRS=peci pdfdocs
    Error: pdflatex or latexmk required for PDF generation
    make[2]: *** [Documentation/Makefile:64: pdfdocs] Error 1
    make[1]: *** [/root/Makefile:1808: pdfdocs] Error 2
    make: *** [Makefile:248: __sub-make] Error 2

Which is the expected behavior.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/linux-doc/e7c29532-71de-496b-a89f-743cef28736e@infradead.org/
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <cd16a7436a510116ef87cd4abbb1f3cfe358012f.1759328070.git.mchehab+huawei@kernel.org>
2025-10-01 08:51:10 -06:00
Mauro Carvalho Chehab
4c6ece9180 tools/docs/sphinx-build-wrapper: allow skipping sphinx-build step
Most targets have two steps:
- step 1: run sphinx-build;
- step 2: run a post-build logic.

The second step can be as simple as copying static files like CSS,
but may may also envolve running make. allowing to skip the first
step helps debugging what's broken, and also allows using make
command line arguments like --ignore-errors.

Add an option to skip step 1.

Requested-by: Akira Yokosawa <akiyks@gmail.com>
Link: https://lore.kernel.org/linux-doc/5031e0c4-f17e-41b8-8955-959989e797f2@gmail.com/
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <30dae295606ae1735f3bbeef4ca041a76dcd4540.1758539031.git.mchehab+huawei@kernel.org>
2025-09-25 11:07:18 -06:00
Mauro Carvalho Chehab
683dd3f79a docs: Makefile: fix rustdoc detection
During cleanups, the logic checking if .config exists were dropped,
but removing it causes false-positives. So, re-add it.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <f414ff9b21eeb770ca1f57eb1496cc064c9bab15.1758539031.git.mchehab+huawei@kernel.org>
2025-09-25 11:07:18 -06:00
Mauro Carvalho Chehab
35b9d338e4 tools/docs: sphinx-build-wrapper: fix compat with recent Tumbleweed
On recent versions of openSUSE Tumbleweed, sphinx-buildis is no longer
a Python script, but something else. Such change is due to how
it now handles alternatives:

    https://en.opensuse.org/openSUSE:Migrating_to_libalternatives_with_alts

The most common approach that distros use for alternatives is via
symlinks:

    lrwxrwxrwx 1 root root 22 out 31  2024 /usr/bin/java -> /etc/alternatives/java
    lrwxrwxrwx 1 root root 37 mar  5  2025 /etc/alternatives/java -> /usr/lib/jvm/java-21-openjdk/bin/java

With such approach, one can sun the script with either:

    <sphinx>
    python3 <script>

However, openSUSE's implementation uses an ELF binary (/usr/bin/alts),
which breaks the latter format.

It is needed to allow users to specify the Python version to be
used while building docs, as some distros like Leap 15.x are
shipped with:

- older, unsupported python3/python3-sphinx packages;
- more modern python3xx/python3xx-sphinx packages that work
  properly.

On such distros, building docs require running make with:

    make PYTHON3=python3.11 htmldocs

Heh, even on more moderen distros where python3-sphinx
is supported, one may still want to use a newer package,
for instance, due to performance issues, as:

    - with Python < 3.11, kernel-doc is 3 times slower;
    - while building htmldocs with Python 3.13/Sphinx 8.x
      takes about 3 minutes on a modern machine, using
      Sphinx < 8.0 can take up to 16 minutes to build docs
      (7.x are the worse ones and require lots of RAM).

So, even with not too old distros, one still may want to use
for instance PYTHON3=python3.11.

To acommodate using PYTHON3 without breaking on Tumbleweed,
add a workaround that will only use:

    $(PYTHON3) sphinx-build

if PYTHON3 env var is not default.

While here, drop the special check for venv, as, with venv,
we can just call sphinx-build directly without any extra
checks.

Reported-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/all/883df949-0281-4a39-8745-bcdcce3a5594@infradead.org/
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <8917f862e0b8484c68408c274129c9f37a7aefb4.1758539031.git.mchehab+huawei@kernel.org>
2025-09-25 11:07:18 -06:00
Mauro Carvalho Chehab
72603d73fa docs: conf.py: get rid of load_config.py
The code here was meant to handle 3 functions:
1. allow having a separate conf.py file, per subdir;
2. generate a list of latex documents.
3. set "subproject" tag if SPHINXDIRS points to a subdir.

We don't have (1) anymore, and (3) is now properly handled
entirely inside conf.py.

So, only (3) is still needed, and this is a single-line change
at conf.py.

So, drop it, moving the remaining code to conf.py.

While here, drop a duplicated $(RUSTDOC) command-line argument.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <ec998f9f268a401ca6aa36e3221d39c97efeccaa.1758361087.git.mchehab+huawei@kernel.org>
2025-09-21 16:40:37 -06:00
Mauro Carvalho Chehab
c2381e8a61 scripts: remove sphinx-build-wrapper from scripts/
Commit 8a298579cdfc ("scripts: sphinx-build-wrapper: get rid of uapi/media Makefile")
accidentally added scripts/sphinx-build-wrapper, probably due
to some rebase issues.

The file was added on a separate patch series, at tools/docs,
and has other patches on the top of it, so drop this extra
version.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <d26137d908dc7813fafcded2c728ec837e4df073.1758361087.git.mchehab+huawei@kernel.org>
2025-09-21 16:40:37 -06:00
Mauro Carvalho Chehab
0aa9c0395e tools/docs: sphinx-build-wrapper: handle sphinx-build errors
If sphinx-build returns an error, exit the script.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <b7e152291fadd91694cbb6b086caefa4b6470fdd.1758361087.git.mchehab+huawei@kernel.org>
2025-09-21 16:40:37 -06:00
Mauro Carvalho Chehab
42180ada39 tools/docs: sphinx-build-wrapper: add support to run inside venv
Sometimes, it is desired to run Sphinx from a virtual environment.
Add a command line parameter to automatically build Sphinx from
such environment.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <e34fa63a61e75a0ec86b37c9b5fafa6677f44c6c.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:20:48 -06:00
Mauro Carvalho Chehab
62ea383b44 tools/docs: sphinx-* break documentation bulds on openSUSE
Before this patch, building htmldocs on opensuseLEAP works
fine:

    # make htmldocs
    Available Python versions:
      /usr/bin/python3.11

    Python 3.6.15 not supported. Changing to /usr/bin/python3.11
    Python 3.6.15 not supported. Changing to /usr/bin/python3.11
    Using alabaster theme
    Using Python kernel-doc

    ...

As the logic detects that Python 3.6 is too old and recommends
intalling python311-Sphinx. If installed, documentation builds
work like a charm.

Yet, some develpers complained that running python3.11 instead
of python3 should not happen. So, let's break the build to make
them happier:

    $ make htmldocs
    Python 3.6.15 not supported. Bailing out
    You could run, instead:
      /usr/bin/python3.11 tools/docs/sphinx-build-wrapper htmldocs \
        --sphinxdirs=. --conf=conf.py --builddir=Documentation/output --theme= --css= \
        --paper=

    Python 3.6.15 not supported. Bailing out
    make[2]: *** [Documentation/Makefile:76: htmldocs] Error 1
    make[1]: *** [Makefile:1806: htmldocs] Error 2
    make: *** [Makefile:248: __sub-make] Error 2

It should be noticed that:

1. after this change, sphinx-pre-install needs to be called
   by hand:

    $ /usr/bin/python3.11 tools/docs/sphinx-pre-install
    Detected OS: openSUSE Leap 15.6.
    Sphinx version: 7.2.6

    All optional dependencies are met.
    Needed package dependencies are met.

2. sphinx-build-wrapper will auto-detect python3.11 and
   suggest a way to build the docs using the parameters passed
   via make variables. In this specific example:

   /usr/bin/python3.11 tools/docs/sphinx-build-wrapper htmldocs --sphinxdirs=. --conf=conf.py --theme= --css= --paper=

3. As this needs to be executed outside docs Makefile, it won't run
   the validation check scripts nor build Rust documentation if
   enabled, as the extra scripts are part of the docs Makefile.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <0635c311295300e9fb48c0ea607e2408910036e3.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:20:48 -06:00
Mauro Carvalho Chehab
2118ba7da6 tools/docs: sphinx-build-wrapper: move rust doc builder to wrapper
Simplify even further the docs Makefile by moving rust build logic
to the wrapper.

After this change, running make on an environment with rust enabled
works as expected.

With CONFIG_RUST:

    $ make O=/tmp/foo LLVM=1 SPHINXDIRS=peci htmldocs
    make[1]: Entrando no diretório '/tmp/foo'

    Using alabaster theme
    Using Python kernel-doc
      GEN     Makefile
      DESCEND objtool
      CC      arch/x86/kernel/asm-offsets.s
      INSTALL libsubcmd_headers
      CALL    /new_devel/docs/scripts/checksyscalls.sh
      RUSTC L rust/core.o
      BINDGEN rust/bindings/bindings_generated.rs
      BINDGEN rust/bindings/bindings_helpers_generated.rs
    ...

Without it:
    $ make SPHINXDIRS=peci htmldocs
    Using alabaster theme
    Using Python kernel-doc

Both work as it is it is supposed to do.

After the change, it is also possible to build directly with the script
by passing "--rustodoc".

if CONFIG_RUST, this works fine:

    $ ./tools/docs/sphinx-build-wrapper --sphinxdirs peci --rustdoc -- htmldocs
    Using alabaster theme
    Using Python kernel-doc
      SYNC    include/config/auto.conf
    ...
      RUSTC L rust/core.o
    ...

If not, it will produce a warning that RUST may be disabled:

    $ ./tools/docs/sphinx-build-wrapper --sphinxdirs peci --rustdoc -- htmldocs
    Using alabaster theme
    Using Python kernel-doc
    ***
    *** Configuration file ".config" not found!
    ***
    *** Please run some configurator (e.g. "make oldconfig" or
    *** "make menuconfig" or "make xconfig").
    ***
    make[1]: *** [/new_devel/docs/Makefile:829: .config] Error 1
    make: *** [Makefile:248: __sub-make] Error 2
    Ignored errors when building rustdoc: Command '['make', 'LLVM=1', 'rustdoc']' returned non-zero exit status 2.. Is RUST enabled?

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <fa1235ccf859f6ebfeef7ffba0ebde2015a75042.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:20:46 -06:00
Mauro Carvalho Chehab
ade9b9576e scripts: kdoc_parser.py: warn about Python version only once
When running kernel-doc over multiple documents, it emits
one error message per file with is not what we want:

	$ python3.6 scripts/kernel-doc.py . --none
	...
	Warning: ./include/trace/events/swiotlb.h:0 Python 3.7 or later is required for correct results
	Warning: ./include/trace/events/iommu.h:0 Python 3.7 or later is required for correct results
	Warning: ./include/trace/events/sock.h:0 Python 3.7 or later is required for correct results
	...

Change the logic to warn it only once at the library:

	$ python3.6 scripts/kernel-doc.py . --none
	Warning: Python 3.7 or later is required for correct results
	Warning: ./include/cxl/features.h:0 Python 3.7 or later is required for correct results

When running from command line, it warns twice, but that sounds
ok.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <68e54cf8b1201d1f683aad9bc710a99421910356.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:19:59 -06:00
Mauro Carvalho Chehab
104e0a682e tools: kernel-doc: add a see also section at man pages
While cross-references are complex, as related ones can be on
different files, we can at least correlate the ones that belong
to the same file, adding a SEE ALSO section for them.

The result is not bad. See for instance:

	$ tools/docs/sphinx-build-wrapper --sphinxdirs driver-api/media -- mandocs
	$ man Documentation/output/driver-api/man/edac_pci_add_device.9

	edac_pci_add_device(9)  Kernel Hacker's Manual  edac_pci_add_device(9)

	NAME
	       edac_pci_add_device  - Insert the 'edac_dev' structure into the
	       edac_pci global list and create sysfs entries  associated  with
	       edac_pci structure.

	SYNOPSIS
	       int  edac_pci_add_device  (struct  edac_pci_ctl_info *pci , int
	       edac_idx );

	ARGUMENTS
	       pci         pointer to the edac_device structure to be added to
	                   the list

	       edac_idx    A unique numeric identifier to be assigned to the

	RETURN
	       0 on Success, or an error code on failure

	SEE ALSO
	       edac_pci_alloc_ctl_info(9),          edac_pci_free_ctl_info(9),
	       edac_pci_alloc_index(9),  edac_pci_del_device(9), edac_pci_cre‐
	       ate_generic_ctl(9),            edac_pci_release_generic_ctl(9),
	       edac_pci_create_sysfs(9), edac_pci_remove_sysfs(9)

	August 2025               edac_pci_add_device   edac_pci_add_device(9)

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <fba25efb41eadad17a54e6275a6191173d702f00.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:19:58 -06:00
Mauro Carvalho Chehab
7e8a8143ec docs: add support to build manpages from kerneldoc output
Generating man files currently requires running a separate
script. The target also doesn't appear at the docs Makefile.

Add support for mandocs at the Makefile, adding the build
logic inside sphinx-build-wrapper, updating documentation
and dropping the ancillary script.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <3d248d724e7f3154f6e3a227e5923d7360201de9.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:19:57 -06:00
Mauro Carvalho Chehab
0d9abc7627 tools/docs: sphinx-build-wrapper: Fix output for duplicated names
When SPHINXDIRS is used, basename may be identical for different
files. If this happens, the summary and error detection won't be
accurate.

Fix it by using relative names from builddir.

While here, don't duplicate names. Report, instead:

- SUCCESS
    output PDF file was built
- FAILED
    latexmk/xelatex didn't build any PDF output
- FAILED: no .tex files were generated
    Sphinx didn't build any tex file for SPHINXDIRS directories
- FAILED ({python exception})
    When a concurrent.futures is catched. Usually indicates an
    internal error at the build logic.

With that, building multiple dirs with the same name is reported
properly:

    $ make V=1 SPHINXDIRS="admin-guide/media driver-api/media userspace-api/media" pdfdocs

    Summary
    =======
    admin-guide/media/pdf/media.pdf  : SUCCESS
    driver-api/media/pdf/media.pdf   : SUCCESS
    userspace-api/media/pdf/media.pdf: SUCCESS

And if at least one of them fails, return code will be 1.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <d4a4f16f6c0c423ad38531a490888be3bf01e574.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:18:39 -06:00
Mauro Carvalho Chehab
82c294d453 tools/docs,scripts: sphinx-*: prevent sphinx-build crashes
On a properly set system, LANG and LC_ALL is always defined.
However, some distros like Debian, Gentoo and their variants
start with those undefioned.

When Sphinx tries to set a locale with:

	locale.setlocale(locale.LC_ALL, '')

It raises an exception, making Sphinx fail. This is more likely
to happen with test containers.

Add a logic to detect and workaround such issue by setting
locale to C.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <1d0afad8fe3d83182be3a08eb00dd71322e23e69.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:18:39 -06:00
Mauro Carvalho Chehab
08e14bc17e tools/docs: sphinx-build-wrapper: allow building PDF files in parallel
Use POSIX jobserver when available or -j<number> to run PDF
builds in parallel, restoring pdf build performance. Yet,
running it when debugging troubles is a bad idea, so, when
calling directly via command line, except if "-j" is splicitly
requested, it will serialize the build.

With such change, a PDF doc builds now takes around 5 minutes
on a Ryzen 9 machine with 32 cpu threads:

	# Explicitly paralelize both Sphinx and LaTeX pdf builds
	$ make cleandocs; time scripts/sphinx-build-wrapper pdfdocs -j 33

	real	5m17.901s
	user	15m1.499s
	sys	2m31.482s

	# Use POSIX jobserver to paralelize both sphinx-build and LaTeX
	$ make cleandocs; time make pdfdocs

	real	5m22.369s
	user	15m9.076s
	sys	2m31.419s

	# Serializes PDF build, while keeping Sphinx parallelized.
	# it is equivalent of passing -jauto via command line
	$ make cleandocs; time scripts/sphinx-build-wrapper pdfdocs

	real	11m20.901s
	user	13m2.910s
	sys	1m44.553s

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <42eef319f9af6f9feb12bcd74ca6392c8119929d.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:18:39 -06:00
Mauro Carvalho Chehab
2f99b85e22 tools/docs: sphinx-build-wrapper: add an argument for LaTeX interactive mode
By default, we use LaTeX batch mode to build docs. This way, when
an error happens, the build fails. This is good for normal builds,
but when debugging problems with pdf generation, the best is to
use interactive mode.

We already support it via LATEXOPTS, but having a command line
argument makes it easier:

Interactive mode:
	./scripts/sphinx-build-wrapper pdfdocs --sphinxdirs peci -v -i
	...
	Running 'xelatex --no-pdf  -no-pdf -recorder  ".../Documentation/output/peci/latex/peci.tex"'
	...

Default batch mode:
        ./scripts/sphinx-build-wrapper pdfdocs --sphinxdirs peci -v
	...
	Running 'xelatex --no-pdf  -no-pdf -interaction=batchmode -no-shell-escape -recorder  ".../Documentation/output/peci/latex/peci.tex"'
	...

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <9e5b9a8becc981b47ca3bf3ddce034f273400738.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:18:39 -06:00
Mauro Carvalho Chehab
c6879037a1 docs: Makefile: document FONTS_CONF_DENY_VF= parameter
This parameter is there for some time, but it doesn't have anything
documenting it at make help.

Add some documentation, pointing to the place where one can find
more details.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <a84680c8f6f34e57c51829242ebc98a609af94c1.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:18:39 -06:00
Mauro Carvalho Chehab
c514b13fd0 docs: Makefile: document latex/PDF PAPER= parameter
While the build system supports this for a long time, this was
never documented. Add a documentation for it.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <9c7b34db18642081d22c36a4203f341c1100341e.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:18:39 -06:00
Mauro Carvalho Chehab
2e1760999e docs: parallel-wrapper.sh: remove script
The only usage of this script was docs Makefile. Now that
it is using the new sphinx-build-wrapper, which has inside
the code from parallel-wrapper.sh, we can drop this script.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <c8ce0c78d0761370e4c9091a9423d9df9a357187.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:18:39 -06:00
Mauro Carvalho Chehab
819667bc3c tools/docs: sphinx-build-wrapper: add a wrapper for sphinx-build
There are too much magic inside docs Makefile to properly run
sphinx-build. Create an ancillary script that contains all
kernel-related sphinx-build call logic currently at Makefile.

Such script is designed to work both as an standalone command
and as part of a Makefile. As such, it properly handles POSIX
jobserver used by GNU make.

On a side note, there was a line number increase due to the
conversion (ignoring comments) is:

 Documentation/Makefile          |  131 +++----------
 tools/docs/sphinx-build-wrapper |  293 +++++++++++++++++++++++++++++++
 2 files changed, 323 insertions(+), 101 deletions(-)

Comments and descriptions adds:
 tools/docs/sphinx-build-wrapper | 261 +++++++++++++++++++++++++++++++-

So, about half of the script are comments/descriptions.

This is because some things are more verbosed on Python and because
it requires reading env vars from Makefile. Besides it, this script
has some extra features that don't exist at the Makefile:

- It can be called directly from command line;
- It properly return PDF build errors.

When running the script alone, it will only take handle sphinx-build
targets. On other words, it won't runn make rustdoc after building
htmlfiles, nor it will run the extra check scripts.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <80ae57b01fcfb1d338d93b8f8e26e57b69b5f16b.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:18:36 -06:00
Mauro Carvalho Chehab
adf9dc2592 tools/docs: python_version: move version check from sphinx-pre-install
The sphinx-pre-install code has some logic to deal with Python
version, which ensures that a minimal version will be enforced
for documentation build logic.

Move it to a separate library to allow re-using its code.

No functional changes.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <d134ace64b55c827565ce68f0527e20c735f0d2e.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:17:19 -06:00
Mauro Carvalho Chehab
3f835cb123 tools/docs: sphinx-pre-install: allow check for alternatives and bail out
The caller script may not want an automatic execution of the new
version. Add two parameters to allow showing alternatives and to
bail out if version is incompatible.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <19777bc710bf901ffbb0ad0f1bb57b18fc01b163.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:17:19 -06:00
Mauro Carvalho Chehab
4880eac5bc tools/docs: sphinx-pre-install: drop a debug print
The version print at the lib was added for debugging purposes.
Get rid of it.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <27f76a4df2b80c38d277d58a92c85c614544e013.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:17:18 -06:00
Mauro Carvalho Chehab
abd61d1ff8 scripts: sphinx-pre-install: move it to tools/docs
As we're reorganizing the place where doc scripts are located,
move this one to tools/docs.

No functional changes.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <5e2c40d3aebfd67b7ac7817f548bd1fa4ff661a8.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:17:18 -06:00
Mauro Carvalho Chehab
92ea342ff6 check-variable-fonts.py: add a helper to display instructions
Use lib docstring to output the comments via --help/-h. With
that, update the default instructions to recomment it instead
of asking the user to read the source code.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <577162cf4e07de74c4a783f16e3404f0040e5e0a.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:17:18 -06:00
Mauro Carvalho Chehab
4515ffdf3c tools/docs: check-variable-fonts.py: split into a lib and an exec file
As we'll be using the actual code inside sphinx-build-wrapper,
split the library from the executable, placing the exec at
the new place we've been using:

	tools/docs

No functional changes.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <8adbc22df1d43b1c5a673799d2333cc429ffe9fc.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:17:18 -06:00
Mauro Carvalho Chehab
75539bec27 scripts: check-variable-fonts.sh: convert to Python
This script handle errors when trying to build translations
with make pdfdocs.

As part of our cleanup work to remove hacks from docs Makefile,
convert this to python, preparing it to be part of a library
to be called by sphinx-build-wrapper.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <d438fb01d2c00e2c2b4ac16f999d9a8ce848251b.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:17:18 -06:00
Mauro Carvalho Chehab
a84a5d0b5a scripts/jobserver-exec: add a help message
Currently, calling it without an argument shows an ugly error
message. Instead, print a message using pythondoc as description.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <64b0339eac54ac0f2b3de3667a7f4f5becb1c6ae.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:17:18 -06:00
Mauro Carvalho Chehab
fce6df7e73 scripts/jobserver-exec: move its class to the lib directory
To make it easier to be re-used, move the JobserverExec class
to the library directory.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <6be7b161b6c005a9807162ebfd239af6a4e6fa47.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:17:18 -06:00
Mauro Carvalho Chehab
2a14f02121 scripts/jobserver-exec: move the code to a class
Convert the code inside jobserver-exec to a class and
properly document it.

Using a class allows reusing the jobserver logic on other
scripts.

While the main code remains unchanged, being compatible with
Python 2.6 and 3.0+, its coding style now follows a more
modern standard, having tabs replaced by a 4-spaces
indent, passing autopep8, black and pylint.

The code allows using a pythonic way to enter/exit a python
code, e.g. it now supports:

	with JobserverExec() as jobserver:
	    jobserver.run(sys.argv[1:])

With the new code, the __exit__() function should ensure
that the jobserver slot will be closed at the end, even if
something bad happens somewhere.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Message-ID: <4749921b75d4e0bd85a25d4d94aa2c940fad084e.1758196090.git.mchehab+huawei@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 11:17:18 -06:00
Marneni PoornaChandu
395107a7c9 docs: driver-api: fix spelling of "buses".
Replace incorrect plural form "busses" with "buses" in
multiple documentation files under "Documentation/driver-api".

Signed-off-by: Marneni PoornaChandu <Poornachandumarneni@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250917220430.5815-1-Poornachandumarneni@gmail.com>
2025-09-18 10:40:46 -06:00
Bagas Sanjaya
4eb018bd15 Documentation: fbcon: Use admonition directives
Use reST syntax for admonitions (notes and custom admonition
for gotcha).

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250909063744.30053-4-bagasdotme@gmail.com>
2025-09-18 10:36:52 -06:00
Bagas Sanjaya
cfa51cfdb5 Documentation: fbcon: Reindent 8th step of attach/detach/unload
Properly indent 8th step text (as enumerated list item) to be inline
with other steps.

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250909063744.30053-3-bagasdotme@gmail.com>
2025-09-18 10:36:52 -06:00
Bagas Sanjaya
78494f9e3b Documentation: fbcon: Add boot options and attach/detach/unload section headings
These last two enumerated sections headings are in normal paragraphs,
making both sections merged into "Loading" section instead.

Add the headings.

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250909063744.30053-2-bagasdotme@gmail.com>
2025-09-18 10:36:52 -06:00
Alex Tran
a3d13ec44a docs: filesystems: sysfs: add remaining top level sysfs directory descriptions
Finish top level sysfs directory descriptions for block, class, firmware,
hypervisor, kernel, and power. Did not write one for net directory. See
commit bc3a88431672 ("docs: filesystems: sysfs: remove top level sysfs net
 directory")

Signed-off-by: Alex Tran <alex.t.tran@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250902023039.1351270-1-alex.t.tran@gmail.com>
2025-09-18 10:33:28 -06:00
Alex Tran
63e6e9dde2 docs: filesystems: sysfs: clarify symlink destinations in dev and bus/devices descriptions
Change sysfs bus/devices and dev directory descriptions to
provide more verbose information about the specific symlink
destination the devices point to.

Signed-off-by: Alex Tran <alex.t.tran@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250902023039.1351270-2-alex.t.tran@gmail.com>
2025-09-18 10:33:28 -06:00
Alex Tran
a1d4416f86 docs: filesystems: sysfs: remove top level sysfs net directory
The net/ directory is not present as a top level sysfs directory
in standard Linux systems. Network interfaces can be accessible
via /sys/class/net instead.

Signed-off-by: Alex Tran <alex.t.tran@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250902023039.1351270-3-alex.t.tran@gmail.com>
2025-09-18 10:33:28 -06:00
Thorsten Blum
d725668ed2 docs: maintainer: Fix ambiguous subheading formatting
Add a newline after both subheadings to avoid any ambiguous formatting,
especially in htmldocs. Without the newline, subheadings are rendered as
part of the following paragraphs, which can be confusing to read.

Suggested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20250916222944.2547948-2-thorsten.blum@linux.dev>
2025-09-18 10:26:45 -06:00
Jonathan Corbet
c018784377 docs: kdoc: a few more dump_typedef() tweaks
Merge "typedef" into the typedef_type pattern rather than repeating it
later, and add some comments.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 10:19:54 -06:00
Jonathan Corbet
00fa9bc4e9 docs: kdoc: remove redundant comment stripping in dump_typedef()
By the time we get here, comments have long since been stripped out; there
is no need to do it again.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 10:19:54 -06:00
Jonathan Corbet
999a642d7e docs: kdoc: remove some dead code in dump_typedef()
The regex in this block of code makes no sense, and a quick test shows that
it never matches anything; simply delete the code.

No output changes.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 10:19:53 -06:00
Jonathan Corbet
3dff54410e docs: kdoc: final dump_function() cleanups
Add some more comments to dump_function(), add some comments, and trim out
an unneeded duplicate output_declaration() call.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 10:19:53 -06:00
Jonathan Corbet
370f430527 docs: kdoc: consolidate some of the macro-processing logic
The logic to handle macros is split in dump_function(); bring it all
together into a single place and add a comment saying what's going on.
Remove the unneeded is_define_proto variable, and tighten up the code
a bit.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 10:19:53 -06:00
Jonathan Corbet
ff1f2af341 docs: kdoc: Simplify the dump_function() prototype regexes
The regexes for the parsing of function prototypes were more complicated
than they needed to be and difficult to understand -- at least, I spent a
fair amount of time bashing my head against them.  Simplify them, and add
some documentation comments as well.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 10:19:53 -06:00
Jonathan Corbet
08b5228cf4 docs: kdoc: remove a useless empty capture group
The is_define_proto case in dump_function() uses a regex with an empty
capture group - () - that has no use; just take it out.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 10:19:53 -06:00
Jonathan Corbet
fee63c8f10 docs: kdoc: remove a couple of spurious regex characters
The "name" regex in dump_function() includes both the tilde and colon
characters, but neither has any place in function prototypes.  Remove the
characters, after which the regex simplifies to "\w+"

No output changes.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
2025-09-18 10:19:53 -06:00