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	Mon, 22 Sep 2025 13:28:13 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: "Jonathan Corbet" <corbet@lwn.net>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
	"Mauro Carvalho Chehab" <mchehab+huawei@kernel.org>,
	linux-kernel@vger.kernel.org,
	Randy Dunlap <rdunlap@infradead.org>
Subject: [PATCH v2 1/3] tools/docs: sphinx-build-wrapper: fix compat with
 recent Tumbleweed
Date: Mon, 22 Sep 2025 13:27:38 +0200
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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/alternativ=
es/java
    lrwxrwxrwx 1 root root 37 mar  5  2025 /etc/alternatives/java -> /usr/l=
ib/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=3Dpython3.11 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=3Dpython3.11.

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@infr=
adead.org/
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
---
 tools/docs/sphinx-build-wrapper | 25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

diff --git a/tools/docs/sphinx-build-wrapper b/tools/docs/sphinx-build-wrap=
per
index bd8e2ed746e7..98c4db5b7c47 100755
--- a/tools/docs/sphinx-build-wrapper
+++ b/tools/docs/sphinx-build-wrapper
@@ -185,6 +185,19 @@ class SphinxBuilder:
         self.kernelrelease =3D os.environ.get("KERNELRELEASE", "unknown")
         self.pdflatex =3D os.environ.get("PDFLATEX", "xelatex")
=20
+        #
+        # Kernel main Makefile defines a PYTHON3 variable whose default is
+        # "python3". When set to a different value, it allows running a
+        # diferent version than the default official python3 package.
+        # Several distros package python3xx-sphinx packages with newer
+        # versions of Python and sphinx-build.
+        #
+        # Honor such variable different than default
+        #
+        self.python =3D os.environ.get("PYTHON3")
+        if self.python =3D=3D "python3":
+            self.python =3D None
+
         if not interactive:
             self.latexopts =3D os.environ.get("LATEXOPTS", "-interaction=
=3Dbatchmode -no-shell-escape")
         else:
@@ -272,10 +285,16 @@ class SphinxBuilder:
             if self.n_jobs:
                 n_jobs =3D str(self.n_jobs)
=20
-            if self.venv:
-                cmd =3D ["python"]
+            #
+            # We can't simply call python3 sphinx-build, as OpenSUSE
+            # Tumbleweed uses an ELF binary file (/usr/bin/alts) to switch
+            # between different versions of sphinx-build. So, only call it
+            # prepending "python3.xx" when PYTHON3 variable is not default.
+            #
+            if self.python:
+                cmd =3D [self.python]
             else:
-                cmd =3D [sys.executable]
+                cmd =3D []
=20
             cmd +=3D [sphinx_build]
             cmd +=3D [f"-j{n_jobs}"]
--=20
2.51.0
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	Mon, 22 Sep 2025 13:28:13 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: "Jonathan Corbet" <corbet@lwn.net>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
	"Mauro Carvalho Chehab" <mchehab+huawei@kernel.org>,
	linux-kernel@vger.kernel.org
Subject: [PATCH v2 2/3] docs: Makefile: fix rustdoc detection
Date: Mon, 22 Sep 2025 13:27:39 +0200
Message-ID: 
 <f414ff9b21eeb770ca1f57eb1496cc064c9bab15.1758539031.git.mchehab+huawei@kernel.org>
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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>
---
 Documentation/Makefile | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/Makefile b/Documentation/Makefile
index cc4ee55c75ed..c60db1038c9c 100644
--- a/Documentation/Makefile
+++ b/Documentation/Makefile
@@ -42,8 +42,10 @@ FONTS_CONF_DENY_VF ?=3D $(HOME)/deny-vf
 # User-friendly check for sphinx-build
 HAVE_SPHINX :=3D $(shell if which $(SPHINXBUILD) >/dev/null 2>&1; then ech=
o 1; else echo 0; fi)
=20
+ifneq ($(wildcard $(srctree)/.config),)
 ifeq ($(CONFIG_RUST),y)
-	RUSTDOC=3D"--rustdoc"
+	RUSTDOC=3D--rustdoc
+endif
 endif
=20
 ifeq ($(HAVE_SPHINX),0)
--=20
2.51.0
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	Mon, 22 Sep 2025 13:28:13 +0200
From: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
To: "Jonathan Corbet" <corbet@lwn.net>,
	Linux Doc Mailing List <linux-doc@vger.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
	"Mauro Carvalho Chehab" <mchehab+huawei@kernel.org>,
	linux-kernel@vger.kernel.org,
	Akira Yokosawa <akiyks@gmail.com>
Subject: [PATCH v2 3/3] tools/docs/sphinx-build-wrapper: allow skipping
 sphinx-build step
Date: Mon, 22 Sep 2025 13:27:40 +0200
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 <30dae295606ae1735f3bbeef4ca041a76dcd4540.1758539031.git.mchehab+huawei@kernel.org>
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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-41b8-8955-959989e797f=
2@gmail.com/
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
 tools/docs/sphinx-build-wrapper | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/tools/docs/sphinx-build-wrapper b/tools/docs/sphinx-build-wrap=
per
index 98c4db5b7c47..cce985dced00 100755
--- a/tools/docs/sphinx-build-wrapper
+++ b/tools/docs/sphinx-build-wrapper
@@ -622,7 +622,8 @@ class SphinxBuilder:
         shutil.rmtree(self.builddir, ignore_errors=3DTrue)
=20
     def build(self, target, sphinxdirs=3DNone,
-              theme=3DNone, css=3DNone, paper=3DNone, deny_vf=3DNone, rust=
doc=3DFalse):
+              theme=3DNone, css=3DNone, paper=3DNone, deny_vf=3DNone, rust=
doc=3DFalse,
+              skip_sphinx=3DFalse):
         """
         Build documentation using Sphinx. This is the core function of this
         module. It prepares all arguments required by sphinx-build.
@@ -644,9 +645,10 @@ class SphinxBuilder:
         #
         # Other targets require sphinx-build, so check if it exists
         #
-        sphinxbuild =3D shutil.which(self.sphinxbuild, path=3Dself.env["PA=
TH"])
-        if not sphinxbuild and target !=3D "mandocs":
-            sys.exit(f"Error: {self.sphinxbuild} not found in PATH.\n")
+        if not skip_sphinx:
+            sphinxbuild =3D shutil.which(self.sphinxbuild, path=3Dself.env=
["PATH"])
+            if not sphinxbuild and target !=3D "mandocs":
+                sys.exit(f"Error: {self.sphinxbuild} not found in PATH.\n")
=20
         if builder =3D=3D "latex":
             if not self.pdflatex_cmd and not self.latexmk_cmd:
@@ -732,7 +734,7 @@ class SphinxBuilder:
=20
             if target =3D=3D "mandocs":
                 self.handle_man(kerneldoc, docs_dir, src_dir, output_dir)
-            else:
+            elif not skip_sphinx:
                 try:
                     result =3D self.run_sphinx(sphinxbuild, build_args,
                                              env=3Dself.env)
@@ -814,6 +816,9 @@ def main():
     parser.add_argument('-i', '--interactive', action=3D'store_true',
                         help=3D"Change latex default to run in interactive=
 mode")
=20
+    parser.add_argument('-s', '--skip-sphinx-build', action=3D'store_true',
+                        help=3D"Skip sphinx-build step")
+
     parser.add_argument("-V", "--venv", nargs=3D'?', const=3Df'{VENV_DEFAU=
LT}',
                         default=3DNone,
                         help=3Df'If used, run Sphinx from a venv dir (defa=
ult dir: {VENV_DEFAULT})')
@@ -829,7 +834,8 @@ def main():
=20
     builder.build(args.target, sphinxdirs=3Dargs.sphinxdirs,
                   theme=3Dargs.theme, css=3Dargs.css, paper=3Dargs.paper,
-                  rustdoc=3Dargs.rustdoc, deny_vf=3Dargs.deny_vf)
+                  rustdoc=3Dargs.rustdoc, deny_vf=3Dargs.deny_vf,
+                  skip_sphinx=3Dargs.skip_sphinx_build)
=20
 if __name__ =3D=3D "__main__":
     main()
--=20
2.51.0