tree: https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git kspp/memcpy/next-20210618/v0 head: fd2aa2a169de8bde9502e7a2fc48cd03d4bfd996 commit: 823c220f26ba7c2fe612e2ecb3e012e807baeab4 [55/82] fortify: Move remaining fortify helpers into fortify-string.h config: x86_64-randconfig-a001-20210618 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project d1baf2895467735ab14f4b3415fce204c0cc8e7f) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git/commit/?id... git remote add kees https://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git git fetch --no-tags kees kspp/memcpy/next-20210618/v0 git checkout 823c220f26ba7c2fe612e2ecb3e012e807baeab4 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 >>): void fortify_panic(const char *name) ^ lib/string_helpers.c:882:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void fortify_panic(const char *name) ^ static 1 warning generated. vim +/fortify_panic +882 lib/string_helpers.c 245fccabb57777 Kees Cook 2021-06-18 881 245fccabb57777 Kees Cook 2021-06-18 @882 void fortify_panic(const char *name) :::::: The code at line 882 was first introduced by commit :::::: 245fccabb5777708f67afa04fc6b99a3f794986f lib/string: Move helper functions out of string.c :::::: TO: Kees Cook <keescook(a)chromium.org&gt; :::::: CC: Kees Cook <keescook(a)chromium.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org