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

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Date:   Thu, 3 Jun 2021 18:32:54 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Daniel Vetter <daniel@...ll.ch>
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

On Fri, Jun 04, 2021 at 12:30:00AM +0200, Daniel Vetter wrote:
> [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

Ah-ha! So it is:

drm/Kconfig:    depends on (AGP || AGP=n) && !EMULATED_CMPXCHG && HAS_DMA
drm/Kconfig:    depends on FB_SIS || FB_SIS=n
drm/msm/Kconfig:        depends on QCOM_OCMEM || QCOM_OCMEM=n
drm/msm/Kconfig:        depends on QCOM_LLCC || QCOM_LLCC=n
drm/msm/Kconfig:        depends on QCOM_COMMAND_DB || QCOM_COMMAND_DB=n

I'll resping and retest. Thanks for the pointer!

-Kees

-- 
Kees Cook