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docs: changes: better document Python needs

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Python is listed as an optional dependency, but this is not
true, as:

1) arm (multi_v7_defconfig and other defconfigs) and arm64 defconfig
   needs it due to DRM_MSM dependencies;

2) CONFIG_LTO_CLANG runs a python script at scripts/Makefile.vmlinux_o;

3) kernel-doc is called during compilation when some DRM options
   like CONFIG_DRM_I915_WERROR are enabled;

4) allyesconfig/allmodconfig will enable CONFIG_* dependencies
   that needs it;

5) besides DRM, other subsystems seem to have logic calling *.py
   scripts.

So, better document that and change the dependency from optional
to mandatory to reflect the current needs.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Akira Yokosawa <akiyks@gmail.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/b03b95b8d09358e81e4f27942839191f49b0ba80.1753806485.git.mchehab+huawei@kernel.org
This commit is contained in:
Mauro Carvalho Chehab 2025-07-29 18:43:04 +02:00 committed by Jonathan Corbet
parent fc973dcd73
commit bc20c56e98
1 changed files with 8 additions and 1 deletions
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9
Documentation/process/changes.rst
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@ -61,7 +61,7 @@ Sphinx\ [#f1]_ 3.4.3 sphinx-build --version
GNU tar 1.28 tar --version GNU tar 1.28 tar --version
gtags (optional) 6.6.5 gtags --version gtags (optional) 6.6.5 gtags --version
mkimage (optional) 2017.01 mkimage --version mkimage (optional) 2017.01 mkimage --version
Python (optional) 3.9.x python3 --version Python 3.9.x python3 --version
GNU AWK (optional) 5.1.0 gawk --version GNU AWK (optional) 5.1.0 gawk --version
====================== =============== ======================================== ====================== =============== ========================================
@ -154,6 +154,13 @@ Perl
You will need perl 5 and the following modules: ``Getopt::Long``, You will need perl 5 and the following modules: ``Getopt::Long``,
``Getopt::Std``, ``File::Basename``, and ``File::Find`` to build the kernel. ``Getopt::Std``, ``File::Basename``, and ``File::Find`` to build the kernel.
Python
------
Several config options require it: it is required for arm/arm64
default configs, CONFIG_LTO_CLANG, some DRM optional configs,
the kernel-doc tool, and docs build (Sphinx), among others.
BC BC
-- --