Hi Cai, Thank you for the patch! Yet something to improve: [auto build test ERROR on tip/perf/core] [also build test ERROR on rdma/for-next rostedt-trace/for-next v5.15 next-20211109] [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/Cai-Huoqing/kthread-Add-the-help... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 26da4abfb38201c3cbe127daeded76d4c2bc9077 config: x86_64-rhel-8.3 (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/a4b7e969d5a4960e35916c7f05463e1f3... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Cai-Huoqing/kthread-Add-the-helper-function-kthread_run_on_cpu/20211022-110201 git checkout a4b7e969d5a4960e35916c7f05463e1f32c23598 # 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 >>, old ones prefixed by <<): --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org