[kbuild-all] [andersson-kernel:wip/c630-5.8 5/14] drivers/gpu/drm/bridge/ti-sn65dsi86.c:987: undefined reference to `devm_backlight_device_register'

tree: https://github.com/andersson/kernel wip/c630-5.8 head: ec3ba39ec298706d7661256cd9bcfa8d35f752dc commit: 8b62fc5e193970502a05db475a5c7842005821ca [5/14] sn65dsi86: backlight config: i386-randconfig-a011-20200713 (attached as .config) compiler: gcc-9 (Debian 9.3.0-14) 9.3.0 reproduce (this is a W=1 build): git checkout 8b62fc5e193970502a05db475a5c7842005821ca # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: drivers/gpu/drm/bridge/ti-sn65dsi86.o: in function `ti_sn_backlight_init': vim +987 drivers/gpu/drm/bridge/ti-sn65dsi86.c 966 967 static int ti_sn_backlight_init(struct ti_sn_bridge *pdata) 968 { 969 struct backlight_properties props = {}; 970 struct backlight_device *bl; 971 struct device *dev = pdata->dev; 972 struct device_node *np = dev->of_node; 973 int ret; 974 975 ret = of_property_read_u32(np, "max-brightness", &pdata->max_brightness); 976 if (ret == -EINVAL) { 977 DRM_ERROR("max-brightness omitted\n"); 978 return 0; 979 } 980 else if (ret || pdata->max_brightness >= 0xffff) { 981 DRM_ERROR("invalid max-brightness\n"); 982 return -EINVAL; 983 } 984 985 props.type = BACKLIGHT_RAW; 986 props.max_brightness = pdata->max_brightness; 988 &ti_sn_backlight_ops, &props); 989 if (IS_ERR(bl)) { 990 DRM_ERROR("failed to register backlight device\n"); 991 return PTR_ERR(bl); 992 } 993 994 return 0; 995 } 996 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org