linux-kernel - ERROR: modpost: "drm_display_mode_to_videomode" [drivers/gpu/drm/bridge/lontium-lt8912b.ko] undefined!

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Date:   Tue, 4 May 2021 20:30:09 +0200
From:   Michal Suchánek <msuchanek@...e.de>
To:     Adrien Grassein <adrien.grassein@...il.com>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: ERROR: modpost: "drm_display_mode_to_videomode"
 [drivers/gpu/drm/bridge/lontium-lt8912b.ko] undefined!

Hello,

I get errors about missing symbol in the lontium-lt8912b module.

Is the problem self-evident or do you need the config as well?

I don't need the driver for anything, it was just auto-enabled because
it's new and the change has not been reviewed.

Thanks

Michal
> 
> Last output:
>   WRAP    arch/powerpc/boot/zImage.maple
>   WRAP    arch/powerpc/boot/zImage.pseries
> make[2]: *** Deleting file 'modules-only.symvers'
>   MODPOST modules-only.symvers
> ERROR: modpost: "drm_display_mode_to_videomode" [drivers/gpu/drm/bridge/lontium-lt8912b.ko] undefined!
> make[2]: *** [../scripts/Makefile.modpost:150: modules-only.symvers] Error 1
> make[1]: *** [/home/abuild/rpmbuild/BUILD/kernel-vanilla-5.12.0.13670.g5e321ded302d/linux-5.12-13670-g5e321ded302d/Makefile:1770: modules] Error 2
> make: *** [../Makefile:215: __sub-make] Error 2
> error: Bad exit status from /var/tmp/rpm-tmp.q1oSIp (%build)