tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 8ab774587903771821b59471cc723bba6d893942 commit: 1cbdf60bd1b74e397d48aa877367cfc621f45ffe kasan: arm64: support specialized outlined tag mismatch checks date: 6 months ago config: arm64-randconfig-r032-20211116 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project fbe72e41b99dc7994daac300d208a955be3e4a0a) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 1cbdf60bd1b74e397d48aa877367cfc621f45ffe # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=arm64 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 kasan_tag_mismatch(unsigned long addr, unsigned long access_info, ^ mm/kasan/sw_tags.c:211:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void kasan_tag_mismatch(unsigned long addr, unsigned long access_info, ^ static 1 warning generated. vim +/kasan_tag_mismatch +211 mm/kasan/sw_tags.c 210 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org