Hi Zhen, Thank you for the patch! Yet something to improve: [auto build test ERROR on tip/sched/core] [also build test ERROR on linus/master kees/for-next/pstore v5.17-rc3 next-20220211] [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/0day-ci/linux/commits/Zhen-Ni/sched-move-deadline_peri... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git c8eaf6ac76f40f6c59fc7d056e2e08c4a57ea9c7 config: arm-randconfig-c002-20220213 (https://download.01.org/0day-ci/archive/20220213/202202132047.Oh4JMFtB-lk...) compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0 reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/0day-ci/linux/commit/c785b6fd90f2f1a7dc49c7fcbd30ad54e... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Zhen-Ni/sched-move-deadline_period-sysctls-to-deadline-c/20220211-150312 git checkout c785b6fd90f2f1a7dc49c7fcbd30ad54ecff0e75 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arm SHELL=/bin/bash 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 >>): 49 | static void __init sched_dl_sysctl_init(void) | ^~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +/sched_dl_sysctl_init +49 kernel/sched/deadline.c 48 50 { 51 register_sysctl_init("kernel", sched_dl_sysctls); 52 } 53 #else 54 #define sched_dl_sysctl_init() do { } while (0) 55 #endif 56 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org