tree: https://github.com/esmil/linux visionfive head: e46c3a7e373e6faa03399f1a41c29cf7546c37cb commit: 7c451b4efc456af4a20559eb4108b7f21b4c98b2 [19/80] riscv: optimized memcpy config: riscv-randconfig-r042-20220118 (https://download.01.org/0day-ci/archive/20220119/202201191007.pTfIzJYE-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project f7b7138a62648f4019c55e4671682af1f851f295) 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/esmil/linux/commit/7c451b4efc456af4a20559eb4108b7f21b4... git remote add esmil https://github.com/esmil/linux git fetch --no-tags esmil visionfive git checkout 7c451b4efc456af4a20559eb4108b7f21b4c98b2 # 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 mm/kasan/ 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 >>): void *memcpy(void *dest, const void *src, size_t len) ^ mm/kasan/shadow.c:63:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void *memcpy(void *dest, const void *src, size_t len) ^ static 1 warning generated. vim +/memcpy +63 mm/kasan/shadow.c bb359dbcb70085 Andrey Konovalov 2020-12-22 61 bb359dbcb70085 Andrey Konovalov 2020-12-22 62 #undef memcpy bb359dbcb70085 Andrey Konovalov 2020-12-22 @63 void *memcpy(void *dest, const void *src, size_t len) bb359dbcb70085 Andrey Konovalov 2020-12-22 64 { f00748bfa0246c Andrey Konovalov 2021-02-24 65 if (!kasan_check_range((unsigned long)src, len, false, _RET_IP_) || f00748bfa0246c Andrey Konovalov 2021-02-24 66 !kasan_check_range((unsigned long)dest, len, true, _RET_IP_)) bb359dbcb70085 Andrey Konovalov 2020-12-22 67 return NULL; bb359dbcb70085 Andrey Konovalov 2020-12-22 68 bb359dbcb70085 Andrey Konovalov 2020-12-22 69 return __memcpy(dest, src, len); bb359dbcb70085 Andrey Konovalov 2020-12-22 70 } bb359dbcb70085 Andrey Konovalov 2020-12-22 71 :::::: The code at line 63 was first introduced by commit :::::: bb359dbcb70085a63e8bdbf14837a900750f0cf7 kasan: split out shadow.c from common.c :::::: TO: Andrey Konovalov <andreyknvl(a)google.com&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org