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

From	kbuild test robot <fengguang.wu@intel.com>
Newsgroups	linux.kernel
Subject	panel-samsung-s6e3ha2.c:undefined reference to `backlight_device_unregister'
Date	2017-06-12 04:40 +0200
Message-ID	<tRnqN-4Ie-1@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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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panel-samsung-s6e3ha2.c:undefined reference to  `backlight_device_unregister' kbuild test robot <fengguang.wu@intel.com> - 2017-06-12 04:40 +0200

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