linux-kernel - Re: [PATCH] [RESEND] drm: fb_helper: fix CONFIG

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Date:   Mon, 27 Sep 2021 09:23:45 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     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@...db.de>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RESEND] drm: fb_helper: fix CONFIG_FB dependency

On Mon, Sep 27, 2021 at 04:28:02PM +0200, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> With CONFIG_FB=m and CONFIG_DRM=y, we get a link error in the fb helper:
> 
> aarch64-linux-ld: drivers/gpu/drm/drm_fb_helper.o: in function `drm_fb_helper_alloc_fbi':
> (.text+0x10cc): undefined reference to `framebuffer_alloc'
> 
> Tighten the dependency so it is only allowed in the case that DRM can
> link against FB.
> 
> Fixes: f611b1e7624c ("drm: Avoid circular dependencies for CONFIG_FB")
> Link: https://lore.kernel.org/all/20210721152211.2706171-1-arnd@kernel.org/
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Thanks for fixing this!

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook