linux-kernel - Re: [PATCH v2 13/33] drm/client: Add some tests for drm_connector_pick_cmdline

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Message-ID: <875yhe47z8.fsf@intel.com>
Date:   Fri, 23 Sep 2022 14:59:23 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Maxime Ripard <maxime@...no.tech>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Maxime Ripard <mripard@...nel.org>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Emma Anholt <emma@...olt.net>,
        Karol Herbst <kherbst@...hat.com>,
        Samuel Holland <samuel@...lland.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>, Lyude Paul <lyude@...hat.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Chen-Yu Tsai <wens@...e.org>
Cc:     Hans de Goede <hdegoede@...hat.com>, nouveau@...ts.freedesktop.org,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Phil Elwell <phil@...pberrypi.com>,
        intel-gfx@...ts.freedesktop.org,
        Noralf Trønnes <noralf@...nnes.org>,
        Dom Cobley <dom@...pberrypi.com>, linux-sunxi@...ts.linux.dev,
        Maxime Ripard <maxime@...no.tech>,
        Mateusz Kwiatkowski <kfyatek+publicgit@...il.com>,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 13/33] drm/client: Add some tests for
 drm_connector_pick_cmdline_mode()

On Thu, 22 Sep 2022, Maxime Ripard <maxime@...no.tech> wrote:
> drm_connector_pick_cmdline_mode() is in charge of finding a proper
> drm_display_mode from the definition we got in the video= command line
> argument.
>
> Let's add some unit tests to make sure we're not getting any regressions
> there.
>
> Signed-off-by: Maxime Ripard <maxime@...no.tech>
>
> diff --git a/drivers/gpu/drm/drm_client_modeset.c b/drivers/gpu/drm/drm_client_modeset.c
> index bbc535cc50dd..d553e793e673 100644
> --- a/drivers/gpu/drm/drm_client_modeset.c
> +++ b/drivers/gpu/drm/drm_client_modeset.c
> @@ -1237,3 +1237,7 @@ int drm_client_modeset_dpms(struct drm_client_dev *client, int mode)
>  	return ret;
>  }
>  EXPORT_SYMBOL(drm_client_modeset_dpms);
> +
> +#ifdef CONFIG_DRM_KUNIT_TEST
> +#include "tests/drm_client_modeset_test.c"
> +#endif
> diff --git a/drivers/gpu/drm/tests/drm_client_modeset_test.c b/drivers/gpu/drm/tests/drm_client_modeset_test.c
> new file mode 100644
> index 000000000000..46335de7bc6b
> --- /dev/null
> +++ b/drivers/gpu/drm/tests/drm_client_modeset_test.c

[snip]

> +MODULE_AUTHOR("Maxime Ripard <mripard@...nel.org>");
> +MODULE_LICENSE("GPL");

I think these annotations are incompatible with including the unit test,
and, in this case, affect drm.ko.

And we'll have two kinds of tests, those that get built via
tests/Makefile, and those that get included, like this one, which should
not be mentioned in tests/Makefile.

BR,
Jani.

-- 
Jani Nikula, Intel Open Source Graphics Center