tree: https://github.com/c-sky/csky-linux riscv_compat_v2_sv48_v3_mmind_pbmt head: b28a50c03a72c48d3895320bdd0757e0a8acb881 commit: 414a3c26e45780d9f957d3721666dfe099b8643c [40/44] riscv: add cpufeature handling via alternatives config: riscv-randconfig-r026-20220116 (https://download.01.org/0day-ci/archive/20220119/202201190211.LvmwaVLe-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c10cbb243cafc0cf42c3e922cb29183279444432) 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/414a3c26e45780d9f957d3721666df... git remote add csky-linux https://github.com/c-sky/csky-linux git fetch --no-tags csky-linux riscv_compat_v2_sv48_v3_mmind_pbmt git checkout 414a3c26e45780d9f957d3721666dfe099b8643c # 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