linux-kernel - Re: panel-samsung-s6e3ha2.c:undefined reference to `backlight_device

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Date:   Tue, 30 May 2017 14:13:20 +0900
From:   Hoegeun Kwon <hoegeun.kwon@...sung.com>
To:     Thierry Reding <treding@...dia.com>
Cc:     Arnd Bergmann <arnd@...db.de>, kbuild-all@...org,
        linux-kernel@...r.kernel.org, Donghwa Lee <dh09.lee@...sung.com>,
        Hyungwon Hwang <human.hwang@...sung.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Hoegeun Kwon <hoegeun.kwon@...sung.com>
Subject: Re: panel-samsung-s6e3ha2.c:undefined reference to
 `backlight_device_unregister'

Dear Thierry,

This problem need to [1] patch.

[1] https://patchwork.kernel.org/patch/9688585/

Best regards,
Hoegeun

On 05/28/2017 11:52 AM, kbuild test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   249f1efd8e3d58f86469fc305b0eda39db18d7ce
> commit: ed29f9426d9bf1b5ec7e79dfb28f39de7b3a0069 drm/panel: Add support for S6E3HA2 panel driver on TM2 board
> date:   7 weeks ago
> config: x86_64-randconfig-s3-05280946 (attached as .config)
> compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
> reproduce:
>          git checkout ed29f9426d9bf1b5ec7e79dfb28f39de7b3a0069
>          # save the attached .config to linux build tree
>          make ARCH=x86_64
>
> All errors (new ones prefixed by >>):
>
>     drivers/built-in.o: In function `s6e3ha2_remove':
>>> panel-samsung-s6e3ha2.c:(.text+0x1cc45f): undefined reference to `backlight_device_unregister'
>     drivers/built-in.o: In function `s6e3ha2_probe':
>>> panel-samsung-s6e3ha2.c:(.text+0x1cd24c): undefined reference to `backlight_device_register'
>     panel-samsung-s6e3ha2.c:(.text+0x1cd34d): undefined reference to `backlight_device_unregister'
>
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation