linux-kernel - Re: [PATCH v4 0/4] Don't create Python bytecode when building the kernel

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Message-ID: <87v7qtzg59.fsf@trenco.lwn.net>
Date: Thu, 24 Apr 2025 10:19:14 -0600
From: Jonathan Corbet <corbet@....net>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>, Linux Doc Mailing
 List <linux-doc@...r.kernel.org>
Cc: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
 linux-kernel@...r.kernel.org, David Airlie <airlied@...il.com>, Jani
 Nikula <jani.nikula@...ux.intel.com>, Joonas Lahtinen
 <joonas.lahtinen@...ux.intel.com>, Maarten Lankhorst
 <maarten.lankhorst@...ux.intel.com>, Masahiro Yamada
 <masahiroy@...nel.org>, Maxime Ripard <mripard@...nel.org>, Nathan
 Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas.schier@...ux.dev>,
 Rodrigo Vivi <rodrigo.vivi@...el.com>, Simona Vetter <simona@...ll.ch>,
 Thomas Zimmermann <tzimmermann@...e.de>, Tvrtko Ursulin
 <tursulin@...ulin.net>, dri-devel@...ts.freedesktop.org,
 intel-gfx@...ts.freedesktop.org, linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v4 0/4] Don't create Python bytecode when building the
 kernel

Mauro Carvalho Chehab <mchehab+huawei@...nel.org> writes:

> As reported by Andy, the Kernel build system runs kernel-doc script for DRM,
> when W=1. Due to Python's normal behavior, its JIT compiler will create
> a bytecode and store it under scripts/lib/*/__pycache__.  As one may be using
> O= and even having the sources on a read-only mount point, disable its
> creation during build time.
>
> This is done by adding PYTHONDONTWRITEBYTECODE=1 on every place
> where the script is called within Kbuild and when called via another script.
>  
> This only solves half of the issue though, as one may be manually running
> the script by hand, without asking Python to not store any bytecode.
> This should be OK, but afterwards, git status will list the __pycache__ as
> not committed. To prevent that, add *.pyc to .gitignore.
>
> This series contain 4 patches:
>
> - patch 1 adjusts a variable that pass extra data to scripts/kerneldoc.py;
> - patch 2moves scripts/kernel-doc location to the main makefile
>   and exports it, as scripts/Makefile.build will need it;
> - patch 3 disables __pycache__ generation and ensure that the entire Kbuild
>   will use KERNELDOC var for the location of kernel-doc;
> - patch 4 adds *.pyc at the list of object files to be ignored.

I've applied the set, thanks.

jon