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

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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'

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

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panel-samsung-s6e3ha2.c:undefined reference to  `backlight_device_unregister' kbuild test robot <fengguang.wu@intel.com> - 2017-05-28 05:00 +0200
  Re: panel-samsung-s6e3ha2.c:undefined reference to  `backlight_device_unregister' Hoegeun Kwon <hoegeun.kwon@samsung.com> - 2017-05-30 07:20 +0200

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