linux-kernel - Re: [PATCH] drm/todo: Add entry for using kunit in the subsystem

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Date:   Wed, 4 May 2022 16:16:19 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Javier Martinez Canillas <javierm@...hat.com>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Jonathan Corbet <corbet@....net>,
        David Airlie <airlied@...ux.ie>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/todo: Add entry for using kunit in the subsystem

On Wed, May 04, 2022 at 10:34:39AM +0200, Javier Martinez Canillas wrote:
> Hello Maxime,
> 
> Thanks for your feedback.
> 
> On 5/4/22 10:10, Maxime Ripard wrote:
> > Hi,
> > 
> > On Wed, May 04, 2022 at 10:02:12AM +0200, Javier Martinez Canillas wrote:
> >> The Kernel Unit Testing (KUnit) framework provides a common framework for
> >> unit tests within the Linux kernel. Having a test suite would allow to
> >> identify regressions earlier.
> >>
> >> Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
> >> ---
> >>
> >>  Documentation/gpu/todo.rst | 14 ++++++++++++++
> >>  1 file changed, 14 insertions(+)
> >>
> >> diff --git a/Documentation/gpu/todo.rst b/Documentation/gpu/todo.rst
> >> index 127e76ee0b2d..10bfb50908d1 100644
> >> --- a/Documentation/gpu/todo.rst
> >> +++ b/Documentation/gpu/todo.rst
> >> @@ -603,6 +603,20 @@ Level: Advanced
> >>  Better Testing
> >>  ==============
> >>  
> >> +Add unit tests using the Kernel Unit Testing (KUnit) framework
> >> +--------------------------------------------------------------
> >> +
> >> +The `KUnit <https://www.kernel.org/doc/html/latest/dev-tools/kunit/index.html>`_
> >> +provides a common framework for unit tests within the Linux kernel. Having a
> >> +test suite would allow to identify regressions earlier.
> >> +
> >> +A good candidate for the first unit tests are the format-conversion helpers in
> >> +``drm_format_helper.c``.
> >> +
> >> +Contact: Javier Martinez Canillas <javierm@...hat.com>
> >> +
> >> +Level: Intermediate
> > 
> > Kunit is fairly easy to grasp if you have some knowledge of other unit
> > testing frameworks already (pytest, cmocka, etc.)
> >
> 
> Yes, I didn't set to intermediate due kunit but rather due the format
> conversions, since the functions are not easy to read and understand.
> 
> And the person writing the unit tests will have to get familiar with
> the different formats to verify that conversions are done correctly.
>  
> > Another good candidate would be to convert (some ?) selftests to kunit.
> > I'm not sure the others, but at least test-drm_cmdline_parser should be
> > fairly easy to convert.
> >
> 
> Indeed. Maybe I would add it as a separate entr though, as a follow-up.

Yeah, that works for me

Acked-by: Maxime Ripard <maxime@...no.tech>

Maxime

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