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: um-allmodconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # 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 make W=1 ARCH=um 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 >>): 702 | int shadow_child(struct dm_btree_info *info, struct dm_btree_value_type *vt, | ^~~~~~~~~~~~ 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