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Date:   Thu, 12 Jul 2018 09:35:38 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Chen-Yu Tsai <wens@...e.org>, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [v3] drm/sun4i: fix build failure with
 CONFIG_DRM_SUN8I_MIXER=m

On Wed, Jul 11, 2018 at 04:43:10PM +0200, Arnd Bergmann wrote:
> Having DRM_SUN4I built-in but DRM_SUN8I_MIXER as a loadable module results in
> a link error, as we try to access a symbol from the sun8i_tcon_top.ko module:
> 
> ERROR: "sun8i_tcon_top_of_table" [drivers/gpu/drm/sun4i/sun8i-drm-hdmi.ko] undefined!
> ERROR: "sun8i_tcon_top_of_table" [drivers/gpu/drm/sun4i/sun4i-drm.ko] undefined!
> 
> This solves the problem by adding a silent symbol for the tcon_top module,
> building it as a separate module in exactly the cases that we need it,
> but in a way that it is reachable by the other modules.
> 
> Fixes: 57e23de02f48 ("drm/sun4i: DW HDMI: Expand algorithm for possible crtcs")
> Fixes: ef0cf6441fbb ("drm/sun4i: Add support for traversing graph with TCON TOP")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Applied, thanks!
Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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