tree: https://github.com/zen-kernel/zen-kernel 5.10/clearlinux head: f913bdc4bdb24521c1309755d426d7bac427ad2f commit: f32b62caf790b6f63e5b447108b90febb9c009eb [9/25] raid6: add Kconfig option to skip raid6 benchmarking config: x86_64-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/f32b62caf790b6f63e5b44710... git remote add zen-kernel-zen-kernel https://github.com/zen-kernel/zen-kernel git fetch --no-tags zen-kernel-zen-kernel 5.10/clearlinux git checkout f32b62caf790b6f63e5b447108b90febb9c009eb # save the attached .config to linux build tree make W=1 ARCH=x86_64 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