On 12/15/19 9:22 PM, Stephen Rothwell wrote:
> Hi all,
> 
> Changes since 20191213:
> 

on x86_64:

ld: drivers/gpu/drm/drm_panel.o: in function `drm_panel_of_backlight':
(.text+0x2ee): undefined reference to `devm_of_find_backlight'

ld: drivers/gpu/drm/i915/display/intel_panel.o: in function `intel_backlight_device_register':
intel_panel.c:(.text+0x593e): undefined reference to `backlight_device_register'
ld: drivers/gpu/drm/i915/display/intel_panel.o: in function `intel_backlight_device_unregister':
intel_panel.c:(.text+0x5a04): undefined reference to `backlight_device_unregister'

CONFIG_DRM_PANEL=y
CONFIG_BACKLIGHT_CLASS_DEVICE=m
CONFIG_DRM_I915=y

Full randconfig file is attached.

-- 
~Randy
Reported-by: Randy Dunlap <rdunlap@infradead.org>