linux-kernel - Re: [PATCH] drm/pl111: Actually fix CONFIG_VEXPRESS

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Message-ID: <CAKMK7uG7tDVUV3cVmtYMFdwVx1SuEWh6i+VsQ3nLP0Rb=-f0aw@mail.gmail.com>
Date:   Fri, 4 Jun 2021 00:30:00 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Kees Cook <keescook@...omium.org>
Cc:     Emma Anholt <emma@...olt.net>, David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Rob Herring <robh@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/pl111: Actually fix CONFIG_VEXPRESS_CONFIG depends

[gmail is funny]

On Thu, Jun 3, 2021 at 11:58 PM Kees Cook <keescook@...omium.org> wrote:
>
> VEXPRESS_CONFIG needs to either be missing, built-in, or modular when
> pl111 is modular. Update the Kconfig to reflect the need.
>
> Cc: Emma Anholt <emma@...olt.net>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: dri-devel@...ts.freedesktop.org
> Fixes: 4dc7c97d04dc ("drm/pl111: depend on CONFIG_VEXPRESS_CONFIG")
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  drivers/gpu/drm/pl111/Kconfig | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/pl111/Kconfig b/drivers/gpu/drm/pl111/Kconfig
> index c5210a5bef1b..b84879ca430d 100644
> --- a/drivers/gpu/drm/pl111/Kconfig
> +++ b/drivers/gpu/drm/pl111/Kconfig
> @@ -2,7 +2,8 @@
>  config DRM_PL111
>         tristate "DRM Support for PL111 CLCD Controller"
>         depends on DRM
> -       depends on VEXPRESS_CONFIG
> +       depends on ARM || ARM64 || COMPILE_TEST
> +       depends on !VEXPRESS_CONFIG || VEXPRESS_CONFIG=DRM

I thought the canonical way to represent optional dependencies was
depends on FOO || FOO=n

Since we don't really care whether it's the same as DRM (that's
sufficient, but a bit too much), it needs to match DRM_PL111, or be
disabled. It's at least the pattern various drm drivers use for AGP.
If that still works in testing, can you pls respin?
-Daniel

>         depends on COMMON_CLK
>         select DRM_KMS_HELPER
>         select DRM_KMS_CMA_HELPER
> --
> 2.25.1
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch