linux-kernel - Re: [PATCH v4 3/3] drm/format-helper: Add KUnit tests for drm_fb_xrgb8888_to

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Date:   Mon, 19 Sep 2022 10:25:19 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     José Expósito <jose.exposito89@...il.com>
Cc:     javierm@...hat.com, davidgow@...gle.com, dlatypov@...gle.com,
        tzimmermann@...e.de, daniel@...ll.ch, airlied@...ux.ie,
        maarten.lankhorst@...ux.intel.com, jani.nikula@...ux.intel.com,
        maira.canal@....br, isabbasso@...eup.net, magalilemes00@...il.com,
        tales.aparecida@...il.com, geert@...ux-m68k.org,
        dri-devel@...ts.freedesktop.org, kunit-dev@...glegroups.com,
        linux-kernel@...r.kernel.org,
        Maíra Canal <mairacanal@...eup.net>
Subject: Re: [PATCH v4 3/3] drm/format-helper: Add KUnit tests for
 drm_fb_xrgb8888_to_gray8()

On Mon, Sep 19, 2022 at 10:18:01AM +0200, José Expósito wrote:
> Hi Maxime,
> 
> Thanks for looking into the patches.
> 
> On Mon, Sep 19, 2022 at 09:36:45AM +0200, Maxime Ripard wrote:
> > Hi,
> > 
> > On Mon, Sep 19, 2022 at 09:15:31AM +0200, José Expósito wrote:
> > > Extend the existing test cases to test the conversion from XRGB8888 to
> > > grayscale.
> > > 
> > > Tested-by: Maíra Canal <mairacanal@...eup.net>
> > > Reviewed-by: David Gow <davidgow@...gle.com>
> > > Signed-off-by: José Expósito <jose.exposito89@...il.com>
> > > ---
> > >  .../gpu/drm/tests/drm_format_helper_test.c    | 62 +++++++++++++++++++
> > >  1 file changed, 62 insertions(+)
> > > 
> > > diff --git a/drivers/gpu/drm/tests/drm_format_helper_test.c b/drivers/gpu/drm/tests/drm_format_helper_test.c
> > > index 09d358b54da0..71722e828abe 100644
> > > --- a/drivers/gpu/drm/tests/drm_format_helper_test.c
> > > +++ b/drivers/gpu/drm/tests/drm_format_helper_test.c
> > > @@ -37,6 +37,11 @@ struct convert_to_xrgb2101010_result {
> > >  	const u32 expected[TEST_BUF_SIZE];
> > >  };
> > >  
> > > +struct convert_to_gray8_result {
> > > +	unsigned int dst_pitch;
> > > +	const u8 expected[TEST_BUF_SIZE];
> > > +};
> > > +
> > >
> > > [...]
> > >
> > >  static struct kunit_case drm_format_helper_test_cases[] = {
> > >  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb332, convert_xrgb8888_gen_params),
> > >  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb565, convert_xrgb8888_gen_params),
> > >  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_rgb888_test, convert_xrgb8888_gen_params),
> > >  	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_xrgb2101010_test, convert_xrgb8888_gen_params),
> > > +	KUNIT_CASE_PARAM(drm_test_fb_xrgb8888_to_gray8_test, convert_xrgb8888_gen_params),
> > 
> > The trailing test feels redundant,
> 
> Why do you feel like it is redundant? Under the hood, most conversion
> functions reuse the same code, but the *_line() function is unique and
> I think that it is worth testing it.

Sure, I wasn't commenting on the code itself, but the trailing "test" in
the test name: drm_test_fb_xrgb8888_to_gray8_test
                                             ^

Which is redundant since we already have "test" in the prefix.

Maxime