Hi Alexei, I love your patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Alexei-Starovoitov/bpf-Misc-improvements/20210206-150251 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: openrisc-randconfig-p001-20210206 (attached as .config) compiler: or1k-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://github.com/0day-ci/linux/commit/8d71f0650d2551940d9fc39a723d6595ab604715 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Alexei-Starovoitov/bpf-Misc-improvements/20210206-150251 git checkout 8d71f0650d2551940d9fc39a723d6595ab604715 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=openrisc If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>): kernel/bpf/syscall.c: In function 'bpf_prog_get_stats': >> kernel/bpf/syscall.c:1740:21: warning: variable 'tmisses' set but not used [-Wunused-but-set-variable] 1740 | u64 tnsecs, tcnt, tmisses; | ^~~~~~~ vim +/tmisses +1740 kernel/bpf/syscall.c 1730 1731 static void bpf_prog_get_stats(const struct bpf_prog *prog, 1732 struct bpf_prog_stats *stats) 1733 { 1734 u64 nsecs = 0, cnt = 0, misses = 0; 1735 int cpu; 1736 1737 for_each_possible_cpu(cpu) { 1738 const struct bpf_prog_stats *st; 1739 unsigned int start; > 1740 u64 tnsecs, tcnt, tmisses; 1741 1742 st = per_cpu_ptr(prog->stats, cpu); 1743 do { 1744 start = u64_stats_fetch_begin_irq(&st->syncp); 1745 tnsecs = st->nsecs; 1746 tcnt = st->cnt; 1747 tmisses = st->misses; 1748 } while (u64_stats_fetch_retry_irq(&st->syncp, start)); 1749 nsecs += tnsecs; 1750 cnt += tcnt; 1751 misses += misses; 1752 } 1753 stats->nsecs = nsecs; 1754 stats->cnt = cnt; 1755 stats->misses = misses; 1756 } 1757 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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