tree: https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git sched/lazymm head: 99fb3a295f7820ed503d08d5e2941aaf9425fc74 commit: 5c406afe577fdcdfd4432ef87f994055629233cf [7/9] membarrier: Rewrite sync_core_before_usermode() and improve documentation config: arm-randconfig-r026-20210618 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 64720f57bea6a6bf033feef4a5751ab9c0c3b401) 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 # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git/commit/?id... git remote add luto https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git git fetch --no-tags luto sched/lazymm git checkout 5c406afe577fdcdfd4432ef87f994055629233cf # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm 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 >>): #include <asm/membarrier.h> ^~~~~~~~~~~~~~~~~~ 1 error generated. vim +9 kernel/sched/membarrier.c 10 #endif 11 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org