[kbuild-all] [toke:xdp-queueing-02 5/11] kernel/bpf/pifomap.c:197:6: warning: no previous prototype for function 'pifo_set_bit'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git xdp-queueing-02 head: 26dde94b299bc277f7a99a99ba64b4363964e833 commit: 34cc5abfbae0dfcb6967c54cb80f7595bc9c5c37 [5/11] Add a PIFO map type for queueing packets config: i386-randconfig-a002 (https://download.01.org/0day-ci/archive/20220214/202202140517.jN2jJhHH-lk...) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project ea071884b0cc7210b3cc5fe858f0e892a779a23b) 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/toke/linux.git/commit/?id... git remote add toke https://git.kernel.org/pub/scm/linux/kernel/git/toke/linux.git git fetch --no-tags toke xdp-queueing-02 git checkout 34cc5abfbae0dfcb6967c54cb80f7595bc9c5c37 # 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 kernel/bpf/ 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 pifo_set_bit(struct bpf_pifo_queue *queue, u32 rank) ^ kernel/bpf/pifomap.c:197:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void pifo_set_bit(struct bpf_pifo_queue *queue, u32 rank) ^ static void pifo_clear_bit(struct bpf_pifo_queue *queue, u32 rank) ^ kernel/bpf/pifomap.c:208:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void pifo_clear_bit(struct bpf_pifo_queue *queue, u32 rank) ^ static 2 warnings generated. vim +/pifo_set_bit +197 kernel/bpf/pifomap.c 196 198 { 199 u32 i; 200 201 for (i = queue->levels; i > 0; i--) { 202 unsigned long *bitmap = queue->lvl_bitmap[i-1]; 203 set_bit(rank, bitmap); 204 rank /= BITS_PER_TYPE(long); 205 } 206 } 207 209 { 210 u32 i; 211 212 for (i = queue->levels; i > 0; i--) { 213 unsigned long *bitmap = queue->lvl_bitmap[i-1]; 214 clear_bit(rank, bitmap); 215 rank /= BITS_PER_TYPE(long); 216 217 // another bit is set in this word, don't clear bit in higher 218 // level 219 if (*(bitmap + rank)) 220 break; 221 } 222 } 223 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org