Randy's fix got picked up: https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git/commit/?h=fixes&id=f52c08ea5fc8e2057a5913b1f6bfd534e1fb7e4c We're going to need to ensure that this gets backported to stable along with commit: 3347acc6fcd4ee71ad18a9ff9d9dac176b517329 compiler.h: fix barrier_data() on clang On Sat, Nov 21, 2020 at 10:39 AM kernel test robot <lkp@xxxxxxxxx> wrote: > > 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 -- Thanks, ~Nick Desaulniers
