Hi Vasily, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: eb5f95f1593f7c22dac681b19e815828e2af3efd commit: f0cbd3b83ed47803df941865f720934c69abb803 s390/atomic: circumvent gcc 10 build regression date: 6 weeks ago config: s390-randconfig-r011-20200920 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed79827aea444e6995fb3d36abc2bfd36331773c) 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 s390 cross compiling tool for clang build # apt-get install binutils-s390x-linux-gnu git checkout f0cbd3b83ed47803df941865f720934c69abb803 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=s390 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 drivers/tty/tty_buffer.c:8: In file included from include/linux/tty.h:5: In file included from include/linux/fs.h:6: In file included from include/linux/wait_bit.h:8: In file included from include/linux/wait.h:7: In file included from include/linux/list.h:9: In file included from include/linux/kernel.h:12: In file included from include/linux/bitops.h:29: In file included from arch/s390/include/asm/bitops.h:39: __ATOMIC_CONST_OPS(__atomic_add_const, int, "asi") ^ 1 error generated. # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout f0cbd3b83ed47803df941865f720934c69abb803 vim +/i +56 arch/s390/include/asm/atomic_ops.h 126b30c3cb476c Martin Schwidefsky 2016-11-11 51 eb3b7b848fb3dd Martin Schwidefsky 2017-03-24 52 #define __ATOMIC_CONST_OPS(op_name, op_type, op_string) \ eb3b7b848fb3dd Martin Schwidefsky 2017-03-24 53 __ATOMIC_CONST_OP(op_name, op_type, op_string, "\n") \ eb3b7b848fb3dd Martin Schwidefsky 2017-03-24 54 __ATOMIC_CONST_OP(op_name##_barrier, op_type, op_string, "bcr 14,0\n") eb3b7b848fb3dd Martin Schwidefsky 2017-03-24 55 eb3b7b848fb3dd Martin Schwidefsky 2017-03-24 @56 __ATOMIC_CONST_OPS(__atomic_add_const, int, "asi") eb3b7b848fb3dd Martin Schwidefsky 2017-03-24 57 __ATOMIC_CONST_OPS(__atomic64_add_const, long, "agsi") eb3b7b848fb3dd Martin Schwidefsky 2017-03-24 58 :::::: The code at line 56 was first introduced by commit :::::: eb3b7b848fb3dd00f7a57d633d4ae4d194aa7865 s390/rwlock: introduce rwlock wait queueing :::::: TO: Martin Schwidefsky <schwidefsky(a)de.ibm.com&gt; :::::: CC: Martin Schwidefsky <schwidefsky(a)de.ibm.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org