tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 27bba9c532a8d21050b94224ffd310ad0058c353 commit: 3347acc6fcd4ee71ad18a9ff9d9dac176b517329 compiler.h: fix barrier_data() on clang date: 7 days ago config: riscv-randconfig-r003-20201121 (attached as .config) compiler: riscv32-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/torvalds/linux.git/commit/?id=3347acc6fcd4ee71ad18a9ff9d9dac176b517329 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 3347acc6fcd4ee71ad18a9ff9d9dac176b517329 # 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@xxxxxxxxx> All errors (new ones prefixed by >>): In file included from include/vdso/processor.h:10, from arch/riscv/include/asm/processor.h:11, from include/linux/prefetch.h:15, from drivers/net/ethernet/intel/ixgb/ixgb_main.c:6: arch/riscv/include/asm/vdso/processor.h: In function 'cpu_relax': >> arch/riscv/include/asm/vdso/processor.h:14:2: error: implicit declaration of function 'barrier' [-Werror=implicit-function-declaration] 14 | barrier(); | ^~~~~~~ cc1: some warnings being treated as errors vim +/barrier +14 arch/riscv/include/asm/vdso/processor.h ad5d1122b82fbd6 Vincent Chen 2020-06-09 6 ad5d1122b82fbd6 Vincent Chen 2020-06-09 7 static inline void cpu_relax(void) ad5d1122b82fbd6 Vincent Chen 2020-06-09 8 { ad5d1122b82fbd6 Vincent Chen 2020-06-09 9 #ifdef __riscv_muldiv ad5d1122b82fbd6 Vincent Chen 2020-06-09 10 int dummy; ad5d1122b82fbd6 Vincent Chen 2020-06-09 11 /* In lieu of a halt instruction, induce a long-latency stall. */ ad5d1122b82fbd6 Vincent Chen 2020-06-09 12 __asm__ __volatile__ ("div %0, %0, zero" : "=r" (dummy)); ad5d1122b82fbd6 Vincent Chen 2020-06-09 13 #endif ad5d1122b82fbd6 Vincent Chen 2020-06-09 @14 barrier(); ad5d1122b82fbd6 Vincent Chen 2020-06-09 15 } ad5d1122b82fbd6 Vincent Chen 2020-06-09 16 :::::: The code at line 14 was first introduced by commit :::::: ad5d1122b82fbd6a816d1b9d26ee01a6dbc2d757 riscv: use vDSO common flow to reduce the latency of the time-related functions :::::: TO: Vincent Chen <vincent.chen@xxxxxxxxxx> :::::: CC: Palmer Dabbelt <palmerdabbelt@xxxxxxxxxx> --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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