linux-kernel - Re: [PATCH 3/3] drm/pl111: depend on CONFIG_VEXPRESS

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Date:   Thu, 3 Jun 2021 13:42:54 -0500
From:   Rob Herring <robh@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Dave Airlie <airlied@...hat.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Arnd Bergmann <arnd@...nel.org>,
        kernel test robot <lkp@...el.com>,
        Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Emma Anholt <emma@...olt.net>, Rob Clark <robdclark@...il.com>,
        Sean Paul <sean@...rly.run>,
        Sharat Masetty <smasetty@...eaurora.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Sam Ravnborg <sam@...nborg.org>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org
Subject: Re: [PATCH 3/3] drm/pl111: depend on CONFIG_VEXPRESS_CONFIG

On Wed, Jun 2, 2021 at 4:53 PM Kees Cook <keescook@...omium.org> wrote:
>
> Avoid randconfig build failures by requiring VEXPRESS_CONFIG:
>
> aarch64-linux-gnu-ld: drivers/gpu/drm/pl111/pl111_versatile.o: in function `pl111_vexpress_clcd_init':
> pl111_versatile.c:(.text+0x220): undefined reference to `devm_regmap_init_vexpress_config'

pl111_vexpress_clcd_init() starts with:

if (!IS_ENABLED(CONFIG_VEXPRESS_CONFIG))
                return -ENODEV;

Isn't that supposed to be enough to avoid an undefined reference?

Making the whole file depend on VEXPRESS_CONFIG is not right either.
Not all platforms need it.

>
> Fixes: 826fc86b5903 ("drm: pl111: Move VExpress setup into versatile init")
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  drivers/gpu/drm/pl111/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/pl111/Kconfig b/drivers/gpu/drm/pl111/Kconfig
> index 80f6748055e3..c5210a5bef1b 100644
> --- a/drivers/gpu/drm/pl111/Kconfig
> +++ b/drivers/gpu/drm/pl111/Kconfig
> @@ -2,7 +2,7 @@
>  config DRM_PL111
>         tristate "DRM Support for PL111 CLCD Controller"
>         depends on DRM
> -       depends on ARM || ARM64 || COMPILE_TEST
> +       depends on VEXPRESS_CONFIG
>         depends on COMMON_CLK
>         select DRM_KMS_HELPER
>         select DRM_KMS_CMA_HELPER
> --
> 2.25.1
>