Hi Maximilian, I love your patch! Yet something to improve: [auto build test ERROR on sre-power-supply/for-next] [also build test ERROR on hid/for-next linus/master v5.18 next-20220526] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/intel-lab-lkp/linux/commits/Maximilian-Luz/platform-surface-aggregator-Add-support-for-client-hot-removal/20220521-024312 base: https://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply.git for-next config: i386-randconfig-r014-20220516 (https://download.01.org/0day-ci/archive/20220527/202205270727.ZHBcTahI-lkp@xxxxxxxxx/config) compiler: gcc-11 (Debian 11.3.0-1) 11.3.0 reproduce (this is a W=1 build): # https://github.com/intel-lab-lkp/linux/commit/314a7da4f5af820a0475695017585a83226b05b5 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Maximilian-Luz/platform-surface-aggregator-Add-support-for-client-hot-removal/20220521-024312 git checkout 314a7da4f5af820a0475695017585a83226b05b5 # save the config file mkdir build_dir && cp config build_dir/.config make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): ld: drivers/hid/surface-hid/surface_hid_core.o: in function `surface_hid_is_hot_removed.isra.0': >> surface_hid_core.c:(.text+0x1e9): undefined reference to `ssam_device_type' -- 0-DAY CI Kernel Test Service https://01.org/lkp