tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   d4f309ca411887cd61ea389c7abfb70c2eb1e532
commit: 22164fbe274c2dd96d2887fe121896d321000a61 Merge drm/drm-next into drm-misc-next
date:   5 weeks ago
config: x86_64-randconfig-f001-20200209 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
reproduce:
        git checkout 22164fbe274c2dd96d2887fe121896d321000a61
        # save the attached .config to linux build tree
        make ARCH=x86_64 

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

All errors (new ones prefixed by >>):

   ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-sitronix-st7701.ko] undefined!
   ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-sharp-lq101r1sx01.ko] undefined!
   ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-ronbo-rb070d30.ko] undefined!
   ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-rocktech-jh057n00900.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-osd-osd101t2587-53ts.ko] undefined!
   ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-olimex-lcd-olinuxino.ko] undefined!
>> ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-leadtek-ltk500hd1829.ko] undefined!
   ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-kingdisplay-kd097d04.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!
   ERROR: "drm_panel_of_backlight" [drivers/gpu/drm/panel/panel-lvds.ko] undefined!

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