tree: https://github.com/c-sky/csky-linux riscv_compat_v6_svpbmt-v6 head: 54acb36c958fc990cc59889f79c8ddca7386c295 commit: 9a8cf89570e893738c501551591b03bd868c825c [10/35] riscv: add cpufeature handling via alternatives config: riscv-randconfig-c006-20220209 (https://download.01.org/0day-ci/archive/20220211/202202110127.FocCEukg-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project aa845d7a245d85c441d0bd44fc7b6c3be8f3de8d) 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 # install riscv cross compiling tool for clang build # apt-get install binutils-riscv64-linux-gnu # https://github.com/c-sky/csky-linux/commit/9a8cf89570e893738c501551591b03... git remote add csky-linux https://github.com/c-sky/csky-linux git fetch --no-tags csky-linux riscv_compat_v6_svpbmt-v6 git checkout 9a8cf89570e893738c501551591b03bd868c825c # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=riscv SHELL=/bin/bash arch/riscv/kernel/ 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 >>): u32 cpu_apply_feature = 0; ^ 1 warning generated. vim +/cpu_apply_feature +185 arch/riscv/kernel/cpufeature.c 180 181 void riscv_cpufeature_patch_func(struct alt_entry *begin, struct alt_entry *end, 182 unsigned int stage) 183 { 184 u32 cpu_req_feature = cpufeature_probe(stage); --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org