[kbuild-all] [linux-stable-rc:linux-5.4.y 3729/7049] arch/riscv/include/asm/processor.h:68:2: error: implicit declaration of function 'barrier'

Hi Arvind, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.4.y head: 3909e2374335335c9504467caabc906d3f7487e4 commit: c2c5dc84ac51da90cadcb12554c69bdd5ac7aeeb [3729/7049] compiler.h: fix barrier_data() on clang config: riscv-allmodconfig (attached as .config) compiler: riscv64-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/stable/linux-stable-rc.gi... git remote add linux-stable-rc https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git git fetch --no-tags linux-stable-rc linux-5.4.y git checkout c2c5dc84ac51da90cadcb12554c69bdd5ac7aeeb # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=riscv 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/prefetch.h:15, from drivers/net/ethernet/intel/i40e/i40e_txrx.c:4: arch/riscv/include/asm/processor.h: In function 'cpu_relax': 68 | barrier(); | ^~~~~~~ cc1: some warnings being treated as errors vim +/barrier +68 arch/riscv/include/asm/processor.h 7db91e57a0acde Palmer Dabbelt 2017-07-10 59 7db91e57a0acde Palmer Dabbelt 2017-07-10 60 7db91e57a0acde Palmer Dabbelt 2017-07-10 61 static inline void cpu_relax(void) 7db91e57a0acde Palmer Dabbelt 2017-07-10 62 { 7db91e57a0acde Palmer Dabbelt 2017-07-10 63 #ifdef __riscv_muldiv 7db91e57a0acde Palmer Dabbelt 2017-07-10 64 int dummy; 7db91e57a0acde Palmer Dabbelt 2017-07-10 65 /* In lieu of a halt instruction, induce a long-latency stall. */ 7db91e57a0acde Palmer Dabbelt 2017-07-10 66 __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy)); 7db91e57a0acde Palmer Dabbelt 2017-07-10 67 #endif 7db91e57a0acde Palmer Dabbelt 2017-07-10 @68 barrier(); 7db91e57a0acde Palmer Dabbelt 2017-07-10 69 } 7db91e57a0acde Palmer Dabbelt 2017-07-10 70 :::::: The code at line 68 was first introduced by commit :::::: 7db91e57a0acde126a162ababfb1e0ab190130cb RISC-V: Task implementation :::::: TO: Palmer Dabbelt <palmer(a)dabbelt.com&gt; :::::: CC: Palmer Dabbelt <palmer(a)dabbelt.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org