Hi Paul, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 5714ee50bb4375bd586858ad800b1d9772847452 commit: 21e3134b3ec09e722cbcda69788f206adc8db1f4 MIPS: barrier: Clean up rmb() & wmb() definitions date: 10 months ago config: mips-randconfig-c004-20200720 (attached as .config) compiler: mips-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 git checkout 21e3134b3ec09e722cbcda69788f206adc8db1f4 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 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 >>): {standard input}: Assembler messages: {standard input}:1428: Error: found '(', expected: ')' {standard input}:1428: Error: found '(', expected: ')' {standard input}:1428: Error: non-constant expression in ".if" statement {standard input}:1493: Error: found '(', expected: ')' {standard input}:1493: Error: found '(', expected: ')' {standard input}:1493: Error: non-constant expression in ".if" statement {standard input}:1493: Error: junk at end of line, first unrecognized character is `(' {standard input}:1567: Error: found '(', expected: ')' {standard input}:1567: Error: found '(', expected: ')' {standard input}:1567: Error: non-constant expression in ".if" statement {standard input}:1567: Error: junk at end of line, first unrecognized character is `(' {standard input}:7280: Error: found '(', expected: ')' {standard input}:7280: Error: found '(', expected: ')' {standard input}:7280: Error: non-constant expression in ".if" statement {standard input}:7280: Error: junk at end of line, first unrecognized character is `(' {standard input}:7611: Error: found '(', expected: ')' {standard input}:7611: Error: found '(', expected: ')' {standard input}:7611: Error: non-constant expression in ".if" statement {standard input}:7611: Error: junk at end of line, first unrecognized character is `(' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org