tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: 4e78c578cb987725eef1cec7d11b6437109e9a49 commit: b9de06783f01100a2d2fb2864e6f2a802b7bc57f [2035/2472] compiler.h: fix barrier_data() on clang config: alpha-defconfig (attached as .config) compiler: alpha-linux-gcc (GCC) 9.3.0 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://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commi... git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git git fetch --no-tags linux-next master git checkout b9de06783f01100a2d2fb2864e6f2a802b7bc57f # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=alpha 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 arch/alpha/include/asm/barrier.h:21, from arch/alpha/include/asm/atomic.h:6, from include/linux/atomic.h:7, from include/linux/dcache.h:5, from fs/nfs/export.c:7: arch/alpha/include/asm/atomic.h: In function 'atomic_add_return_relaxed': 78 | #define smp_mb() barrier() | ^~~~~~~ arch/alpha/include/asm/atomic.h:72:2: note: in expansion of macro 'smp_mb' 72 | smp_mb(); \ | ^~~~~~ arch/alpha/include/asm/atomic.h:149:2: note: in expansion of macro 'ATOMIC_OP_RETURN' 149 | ATOMIC_OP_RETURN(op, op##l) \ | ^~~~~~~~~~~~~~~~ arch/alpha/include/asm/atomic.h:155:1: note: in expansion of macro 'ATOMIC_OPS' 155 | ATOMIC_OPS(add) | ^~~~~~~~~~ cc1: some warnings being treated as errors vim +/barrier +78 include/asm-generic/barrier.h 0890a264794f33d Linus Torvalds 2015-07-01 76 470c27e4695add2 Vineet Gupta 2015-03-11 77 #ifndef smp_mb 885df91ca3571af David Howells 2012-03-28 @78 #define smp_mb() barrier() 470c27e4695add2 Vineet Gupta 2015-03-11 79 #endif 470c27e4695add2 Vineet Gupta 2015-03-11 80 :::::: The code at line 78 was first introduced by commit :::::: 885df91ca3571afd4b3f50f3391329bbf3c9e262 Create asm-generic/barrier.h :::::: TO: David Howells <dhowells(a)redhat.com&gt; :::::: CC: David Howells <dhowells(a)redhat.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org