Hi Boris, I love your patch! Perhaps something to improve: [auto build test WARNING on kdave/for-next] [also build test WARNING on next-20210408] [cannot apply to v5.12-rc6] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Boris-Burkov/btrfs-support-fsver... base: https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next config: arm64-randconfig-r021-20210408 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 56ea2e2fdd691136d5e6631fa0e447173694b82c) 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 arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/0day-ci/linux/commit/dd118218fea47389631a62ec533207ba3... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Boris-Burkov/btrfs-support-fsverity/20210409-023606 git checkout dd118218fea47389631a62ec533207ba39e69b41 # 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: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): if (desc != NULL) { ^~~~~~~~~~~~ fs/btrfs/verity.c:468:9: note: uninitialized use occurs here return ret; ^~~ fs/btrfs/verity.c:432:2: note: remove the 'if' if its condition is always true if (desc != NULL) { ^~~~~~~~~~~~~~~~~~ fs/btrfs/verity.c:430:9: note: initialize the variable 'ret' to silence this warning int ret; ^ = 0 1 warning generated. vim +432 fs/btrfs/verity.c 415 416 /* 417 * fsverity op that ends enabling verity. 418 * fsverity calls this when it's done with all of the pages in the file 419 * and all of the merkle items have been inserted. We write the 420 * descriptor and update the inode in the btree to reflect its new life 421 * as a verity file. 422 */ 423 static int btrfs_end_enable_verity(struct file *filp, const void *desc, 424 size_t desc_size, u64 merkle_tree_size) 425 { 426 struct btrfs_trans_handle *trans; 427 struct inode *inode = file_inode(filp); 428 struct btrfs_root *root = BTRFS_I(inode)->root; 429 struct btrfs_verity_descriptor_item item; 430 int ret; 431 433 /* write out the descriptor item */ 434 memset(&item, 0, sizeof(item)); 435 btrfs_set_stack_verity_descriptor_size(&item, desc_size); 436 ret = write_key_bytes(BTRFS_I(inode), 437 BTRFS_VERITY_DESC_ITEM_KEY, 0, 438 (const char *)&item, sizeof(item)); 439 if (ret) 440 goto out; 441 /* write out the descriptor itself */ 442 ret = write_key_bytes(BTRFS_I(inode), 443 BTRFS_VERITY_DESC_ITEM_KEY, 1, 444 desc, desc_size); 445 if (ret) 446 goto out; 447 448 /* update our inode flags to include fs verity */ 449 trans = btrfs_start_transaction(root, 1); 450 if (IS_ERR(trans)) { 451 ret = PTR_ERR(trans); 452 goto out; 453 } 454 BTRFS_I(inode)->compat_flags |= BTRFS_INODE_VERITY; 455 btrfs_sync_inode_flags_to_i_flags(inode); 456 ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); 457 btrfs_end_transaction(trans); 458 } 459 460 out: 461 if (desc == NULL || ret) { 462 /* If we failed, drop all the verity items */ 463 drop_verity_items(BTRFS_I(inode), BTRFS_VERITY_DESC_ITEM_KEY); 464 drop_verity_items(BTRFS_I(inode), BTRFS_VERITY_MERKLE_ITEM_KEY); 465 } else 466 btrfs_set_fs_compat_ro(root->fs_info, VERITY); 467 clear_bit(BTRFS_INODE_VERITY_IN_PROGRESS, &BTRFS_I(inode)->runtime_flags); 468 return ret; 469 } 470 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org