tree: https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git ata-trace.v3 head: d973dee7af0328b9176e4a1710fb73093c334698 commit: 41c489a28ae800ac33f419ad83135261e9eba85c [2/73] libata: Add ata_port_classify() helper config: i386-randconfig-r021-20211207 (https://download.01.org/0day-ci/archive/20211209/202112090629.8XnsDIKk-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 097a1cb1d5ebb3a0ec4bcaed8ba3ff6a8e33c00a) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git/commi... git remote add hare-scsi-devel https://git.kernel.org/pub/scm/linux/kernel/git/hare/scsi-devel.git git fetch --no-tags hare-scsi-devel ata-trace.v3 git checkout 41c489a28ae800ac33f419ad83135261e9eba85c # 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=i386 SHELL=/bin/bash arch/x86/kernel/ drivers/ata/ 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 >>): const char *ata_dev_class_string(unsigned int class) ^ drivers/ata/libata-core.c:972:7: note: declare 'static' if the function is not intended to be used outside of this translation unit const char *ata_dev_class_string(unsigned int class) ^ static 1 warning generated. vim +/ata_dev_class_string +972 drivers/ata/libata-core.c 971 973 { 974 static const char * const class_str[] = { 975 "unknown", 976 "ATA", 977 "ATA (unsupported)", 978 "ATAPI", 979 "ATAPI (unsupported", 980 "PMP", 981 "PMP (unsupported)", 982 "SEMB", 983 "SEMB (unsupported)", 984 "ZAC", 985 "ZAC (unsupported)", 986 "none", 987 }; 988 if (class == 0 || (class - 1) >= ARRAY_SIZE(class_str)) 989 return "unknown"; 990 return class_str[class - 1]; 991 } 992 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org