tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master head: fb57b1fabcb28f358901b2df90abd2b48abc1ca8 commit: 58f6902a2eba7313d37d30bce18a331460f19699 [8923/10701] dm zoned: metadata version 2 config: arm64-randconfig-r005-20200520 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project e6658079aca6d971b4e9d7137a3a2ecbc9c34aec) reproduce: 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 git checkout 58f6902a2eba7313d37d30bce18a331460f19699 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 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 <<): unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone) ^ drivers/md/dm-zoned-metadata.c:224:1: note: declare 'static' if the function is not intended to be used outside of this translation unit unsigned int dmz_dev_zone_id(struct dmz_metadata *zmd, struct dm_zone *zone) ^ static drivers/md/dm-zoned-metadata.c:2656:6: warning: no previous prototype for function 'dmz_print_dev' [-Wmissing-prototypes] void dmz_print_dev(struct dmz_metadata *zmd, int num) ^ drivers/md/dm-zoned-metadata.c:2656:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void dmz_print_dev(struct dmz_metadata *zmd, int num) ^ static 2 warnings generated. vim +/dmz_dev_zone_id +224 drivers/md/dm-zoned-metadata.c 209 210 #define dmz_zmd_info(zmd, format, args...) \ 211 DMINFO("(%s): " format, (zmd)->label, ## args) 212 213 #define dmz_zmd_err(zmd, format, args...) \ 214 DMERR("(%s): " format, (zmd)->label, ## args) 215 216 #define dmz_zmd_warn(zmd, format, args...) \ 217 DMWARN("(%s): " format, (zmd)->label, ## args) 218 219 #define dmz_zmd_debug(zmd, format, args...) \ 220 DMDEBUG("(%s): " format, (zmd)->label, ## args) 221 /* 222 * Various accessors 223 */ 225 { 226 unsigned int zone_id; 227 228 if (WARN_ON(!zone)) 229 return 0; 230 231 zone_id = zone->id; 232 if (zmd->nr_devs > 1 && 233 (zone_id >= zmd->dev[1].zone_offset)) 234 zone_id -= zmd->dev[1].zone_offset; 235 return zone_id; 236 } 237 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org