tree: https://git.kernel.org/pub/scm/linux/kernel/git/luto/linux.git sched/lazymm head: ecc3992c36cb88087df9c537e2326efb51c95e31 commit: 9f81d011fbe6ff333c5a68e317d7ed7835db699d [2/10] x86/mm: Handle unlazying membarrier core sync in the arch code config: i386-randconfig-r016-20210617 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # 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 9f81d011fbe6ff333c5a68e317d7ed7835db699d # save the attached .config to linux build tree make W=1 ARCH=i386 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 include/linux/init.h:5, from arch/x86/mm/tlb.c:2: arch/x86/mm/tlb.c: In function 'sync_core_if_membarrier_enabled': 425 | if (unlikely(atomic_read(&next->membarrier_state) & | ^~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ 426 | MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE)) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ arch/x86/mm/tlb.c:426:8: note: each undeclared identifier is reported only once for each function it appears in 426 | MEMBARRIER_STATE_PRIVATE_EXPEDITED_SYNC_CORE)) | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' 78 | # define unlikely(x) __builtin_expect(!!(x), 0) | ^ vim +425 arch/x86/mm/tlb.c 422 423 static void sync_core_if_membarrier_enabled(struct mm_struct *next) 424 { 427 sync_core_before_usermode(); 428 } 429 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org