tree: https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git for-5.18/apple head: c5f09b1b45cbb90147846f82ec0489789c99667e commit: 9018eacbe623b2c3535da37035e5f22d3d70b6ce [6/8] HID: apple: Add support for keyboard backlight on certain T2 Macs. config: um-i386_defconfig (https://download.01.org/0day-ci/archive/20220217/202202170548.gIIZ5R9W-lkp@xxxxxxxxx/config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git/commit/?id=9018eacbe623b2c3535da37035e5f22d3d70b6ce git remote add hid https://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git git fetch --no-tags hid for-5.18/apple git checkout 9018eacbe623b2c3535da37035e5f22d3d70b6ce # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=um SUBARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): /usr/bin/ld: drivers/hid/hid-apple.o: in function `apple_probe': >> hid-apple.c:(.text+0x785): undefined reference to `devm_led_classdev_register_ext' collect2: error: ld returned 1 exit status --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
