tree: https://github.com/zen-kernel/zen-kernel 5.9/clearlinux head: 2a08e6bb06ef6a673a88475b7697cba9d8a39c9d commit: 23c73dec0e7b76f8ff212d93e6b0698b3de678b9 [9/26] raid6: add Kconfig option to skip raid6 benchmarking config: i386-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://github.com/zen-kernel/zen-kernel/commit/23c73dec0e7b76f8ff212d93e... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.9/clearlinux git checkout 23c73dec0e7b76f8ff212d93e6b0698b3de678b9 # save the attached .config to linux build tree make W=1 ARCH=i386 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): lib/raid6/algos.c: In function 'raid6_select_algo': 130 | const struct raid6_calls *gen_fallback; | ^~~~~~~~~~~~ vim +/gen_fallback +130 lib/raid6/algos.c 123 124 #ifdef CONFIG_RAID6_FORCE_ALGO 125 /* TODO don't compile in algos that will never be used */ 126 int __init raid6_select_algo(void) 127 { 128 const struct raid6_recov_calls *recov_fallback = &raid6_recov_intx1; 129 const struct raid6_recov_calls *recov_algo; 131 const struct raid6_calls *gen_algo; 132 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org