panel-samsung-s6e3ha2.c:undefined reference to `backlight_device_unregister'

panel-samsung-s6e3ha2.c:undefined reference to `backlight_device_unregister'

[kbuild test robot]

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Hi Hoegeun,

FYI, the error/warning still remains.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   ea094f3c830a67f252677aacba5d04ebcf55c4d9
commit: ed29f9426d9bf1b5ec7e79dfb28f39de7b3a0069 drm/panel: Add support for S6E3HA2 panel driver on TM2 board
date:   8 weeks ago
config: i386-randconfig-x0-06041640 (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=i386 

All errors (new ones prefixed by >>):

   drivers/built-in.o: In function `s6e3ha2_remove':
>> panel-samsung-s6e3ha2.c:(.text+0x156ba0): undefined reference to `backlight_device_unregister'
   drivers/built-in.o: In function `s6e3ha2_probe':
>> panel-samsung-s6e3ha2.c:(.text+0x15768b): undefined reference to `backlight_device_register'
   panel-samsung-s6e3ha2.c:(.text+0x157728): undefined reference to `backlight_device_unregister'

---
0-DAY kernel test infrastructure                Open Source Technology Center
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panel-samsung-s6e3ha2.c:undefined reference to `backlight_device_unregister'

[kbuild test robot]

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Hi Dave,

It's probably a bug fix that unveils the link errors.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   32c1431eea4881a6b17bd7c639315010aeefa452
commit: ab6eb211b07a42a6346e284056422fd9a8576a99 Merge tag 'drm/panel/for-4.12-rc1' of git://anongit.freedesktop.org/tegra/linux into drm-next
date:   9 weeks ago
config: x86_64-randconfig-h0-06120933 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
        git checkout ab6eb211b07a42a6346e284056422fd9a8576a99
        # 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+0x1a238e): undefined reference to `backlight_device_unregister'
   drivers/built-in.o: In function `s6e3ha2_probe':
>> panel-samsung-s6e3ha2.c:(.text+0x1a257d): undefined reference to `backlight_device_register'
   panel-samsung-s6e3ha2.c:(.text+0x1a2672): undefined reference to `backlight_device_unregister'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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Re: panel-samsung-s6e3ha2.c:undefined reference to `backlight_device_unregister'

[Hoegeun Kwon]

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

panel-samsung-s6e3ha2.c:undefined reference to `backlight_device_unregister'

[kbuild test robot]

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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

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