tree: https://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux.git for-next head: 44ab661dd29db5956b73ae7553865604f9d725fa commit: 3507bc4811771fea6e063d5a2f1685c515002a5b [9/11] riscv: Remove the 'riscv_' prefix of function name config: riscv-randconfig-r026-20200601 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 2388a096e7865c043e83ece4e26654bd3d1a20d5) 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 git checkout 3507bc4811771fea6e063d5a2f1685c515002a5b # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=riscv If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>, old ones prefixed by <<): int __kprobes patch_text_nosync(void *addr, const void *insns, size_t len) ^ arch/riscv/kernel/patch.c:78:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __kprobes patch_text_nosync(void *addr, const void *insns, size_t len) ^ static int __kprobes patch_text(void *addr, u32 insn) ^ arch/riscv/kernel/patch.c:110:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __kprobes patch_text(void *addr, u32 insn) ^ static 2 warnings generated. vim +/patch_text_nosync +78 arch/riscv/kernel/patch.c 77 79 { 80 u32 *tp = addr; 81 int ret; 82 83 ret = patch_insn_write(tp, insns, len); 84 85 if (!ret) 86 flush_icache_range((uintptr_t) tp, (uintptr_t) tp + len); 87 88 return ret; 89 } 90 91 static int __kprobes patch_text_cb(void *data) 92 { 93 struct patch_insn *patch = data; 94 int ret = 0; 95 96 if (atomic_inc_return(&patch->cpu_count) == 1) { 97 ret = 98 patch_text_nosync(patch->addr, &patch->insn, 99 GET_INSN_LENGTH(patch->insn)); 100 atomic_inc(&patch->cpu_count); 101 } else { 102 while (atomic_read(&patch->cpu_count) <= num_online_cpus()) 103 cpu_relax(); 104 smp_mb(); 105 } 106 107 return ret; 108 } 109 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org