ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.ko] undefined!

[kbuild test robot]

Hi Andy,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   b19e8c68470385dd2c5440876591fddb02c8c402
commit: 4a34a9dcec9405e29a0ad7f56400581fbd780691 drm/drm_panel: Fix EXPORT of drm_panel_of_backlight() one more time
date:   8 weeks ago
config: i386-randconfig-f003-20200214 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-4) 7.5.0
reproduce:
        git checkout 4a34a9dcec9405e29a0ad7f56400581fbd780691
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

>> ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.ko] undefined!
>> ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-seiko-43wvf1g.ko] undefined!
>> ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-raydium-rm68200.ko] undefined!
>> ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-panasonic-vvx10f034n00.ko] undefined!
>> ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-ilitek-ili9881c.ko] undefined!
>> ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-simple.ko] undefined!

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

Attachment: .config.gz
Description: application/gzip