[kbuild-all] [dm:for-next 5/8] drivers/md/persistent-data/dm-btree.c:702:5: warning: no previous prototype for function 'shadow_child'

tree: https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git for-next head: 68040817337fda98196974401391f2d1b9f87e49 commit: d69e2e7e28bd1d13ad2ac1f2e9ea6184567d1587 [5/8] dm btree: improve btree residency config: x86_64-randconfig-a013-20210520 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project bf9ef3efaa99c02e7bfc4c57207301b8de39a278) 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/device-mapper/linux-dm.gi... git remote add dm https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git git fetch --no-tags dm for-next git checkout d69e2e7e28bd1d13ad2ac1f2e9ea6184567d1587 # 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 >>): int shadow_child(struct dm_btree_info *info, struct dm_btree_value_type *vt, ^ drivers/md/persistent-data/dm-btree.c:702:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int shadow_child(struct dm_btree_info *info, struct dm_btree_value_type *vt, ^ static 1 warning generated. vim +/shadow_child +702 drivers/md/persistent-data/dm-btree.c 696 697 /* 698 * We often need to modify a sibling node. This function shadows a particular 699 * child of the given parent node. Making sure to update the parent to point 700 * to the new shadow. 701 */ 703 struct btree_node *parent, unsigned index, struct dm_block **result) 704 { 705 int r, inc; 706 dm_block_t root; 707 struct btree_node *node; 708 709 root = value64(parent, index); 710 711 r = dm_tm_shadow_block(info->tm, root, &btree_node_validator, 712 result, &inc); 713 if (r) 714 return r; 715 716 node = dm_block_data(*result); 717 718 if (inc) 719 inc_children(info->tm, node, vt); 720 721 *((__le64 *) value_ptr(parent, index)) = 722 cpu_to_le64(dm_block_location(*result)); 723 724 return 0; 725 } 726 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org