Hi, Thank you for the patch! Yet something to improve: [auto build test ERROR on char-misc/master] url: https://github.com/0day-ci/linux/commits/min-li-xe-renesas-com/misc-Add-R... base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git b3a9e3b9622ae10064826dccb4f7a52bd88c7407 config: x86_64-randconfig-r005-20210317 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/f1c28c63e2514eac89cce46df118039da... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review min-li-xe-renesas-com/misc-Add-Renesas-Synchronization-Management-Unit-SMU-support/20210318-052232 git checkout f1c28c63e2514eac89cce46df118039da7c21e47 # save the attached .config to linux build tree make W=1 ARCH=x86_64 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 >>): In file included from <command-line>:32: 14 | __u8 dpll; | ^~~~ ./usr/include/linux/rsmu.h:15:2: error: unknown type name '__u8' 15 | __u8 mode; | ^~~~ ./usr/include/linux/rsmu.h:20:2: error: unknown type name '__u8' 20 | __u8 dpll; | ^~~~ ./usr/include/linux/rsmu.h:21:2: error: unknown type name '__u8' 21 | __u8 state; | ^~~~ ./usr/include/linux/rsmu.h:26:2: error: unknown type name '__u8' 26 | __u8 dpll; | ^~~~ 27 | __s64 ffo; | ^~~~~ --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org