Hi Theodore, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on tip/perf/core] [also build test WARNING on v5.8-rc5 next-20200717] [cannot apply to ext4/dev] [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/Theodore-Ts-o/ex4-block-bitmap-p... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git c085fb8774671e83f6199a8e838fbc0e57094029 config: arm64-randconfig-r036-20200718 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project ed6b578040a85977026c93bf4188f996148f3218) 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 # 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 >>): ignore_locked ? REQ_RAHEAD : 0, bh); ~~~~~~~~~~~~~ ^ fs/ext4/balloc.c:501:19: note: place parentheses around the '|' expression to silence this warning ignore_locked ? REQ_RAHEAD : 0, bh); ~~~~~~~~~~~~~ ^ fs/ext4/balloc.c:501:19: note: place parentheses around the '?:' expression to evaluate it first ignore_locked ? REQ_RAHEAD : 0, bh); ^ ( ) 1 warning generated. vim +501 fs/ext4/balloc.c 404 405 /** 406 * ext4_read_block_bitmap_nowait() 407 * @sb: super block 408 * @block_group: given block group 409 * 410 * Read the bitmap for a given block_group,and validate the 411 * bits for block/inode/inode tables are set in the bitmaps 412 * 413 * Return buffer_head on success or an ERR_PTR in case of failure. 414 */ 415 struct buffer_head * 416 ext4_read_block_bitmap_nowait(struct super_block *sb, ext4_group_t block_group, 417 bool ignore_locked) 418 { 419 struct ext4_group_desc *desc; 420 struct ext4_sb_info *sbi = EXT4_SB(sb); 421 struct buffer_head *bh; 422 ext4_fsblk_t bitmap_blk; 423 int err; 424 425 desc = ext4_get_group_desc(sb, block_group, NULL); 426 if (!desc) 427 return ERR_PTR(-EFSCORRUPTED); 428 bitmap_blk = ext4_block_bitmap(sb, desc); 429 if ((bitmap_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) || 430 (bitmap_blk >= ext4_blocks_count(sbi->s_es))) { 431 ext4_error(sb, "Invalid block bitmap block %llu in " 432 "block_group %u", bitmap_blk, block_group); 433 ext4_mark_group_bitmap_corrupted(sb, block_group, 434 EXT4_GROUP_INFO_BBITMAP_CORRUPT); 435 return ERR_PTR(-EFSCORRUPTED); 436 } 437 bh = sb_getblk(sb, bitmap_blk); 438 if (unlikely(!bh)) { 439 ext4_warning(sb, "Cannot get buffer for block bitmap - " 440 "block_group = %u, block_bitmap = %llu", 441 block_group, bitmap_blk); 442 return ERR_PTR(-ENOMEM); 443 } 444 445 if (ignore_locked && buffer_locked(bh)) { 446 /* buffer under IO already, return if called for prefetching */ 447 put_bh(bh); 448 return NULL; 449 } 450 451 if (bitmap_uptodate(bh)) 452 goto verify; 453 454 lock_buffer(bh); 455 if (bitmap_uptodate(bh)) { 456 unlock_buffer(bh); 457 goto verify; 458 } 459 ext4_lock_group(sb, block_group); 460 if (ext4_has_group_desc_csum(sb) && 461 (desc->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) { 462 if (block_group == 0) { 463 ext4_unlock_group(sb, block_group); 464 unlock_buffer(bh); 465 ext4_error(sb, "Block bitmap for bg 0 marked " 466 "uninitialized"); 467 err = -EFSCORRUPTED; 468 goto out; 469 } 470 err = ext4_init_block_bitmap(sb, bh, block_group, desc); 471 set_bitmap_uptodate(bh); 472 set_buffer_uptodate(bh); 473 set_buffer_verified(bh); 474 ext4_unlock_group(sb, block_group); 475 unlock_buffer(bh); 476 if (err) { 477 ext4_error(sb, "Failed to init block bitmap for group " 478 "%u: %d", block_group, err); 479 goto out; 480 } 481 goto verify; 482 } 483 ext4_unlock_group(sb, block_group); 484 if (buffer_uptodate(bh)) { 485 /* 486 * if not uninit if bh is uptodate, 487 * bitmap is also uptodate 488 */ 489 set_bitmap_uptodate(bh); 490 unlock_buffer(bh); 491 goto verify; 492 } 493 /* 494 * submit the buffer_head for reading 495 */ 496 set_buffer_new(bh); 497 trace_ext4_read_block_bitmap_load(sb, block_group); 498 bh->b_end_io = ext4_end_bitmap_read; 499 get_bh(bh); 500 submit_bh(REQ_OP_READ, REQ_META | REQ_PRIO | 502 return bh; 503 verify: 504 err = ext4_validate_block_bitmap(sb, desc, block_group, bh); 505 if (err) 506 goto out; 507 return bh; 508 out: 509 put_bh(bh); 510 return ERR_PTR(err); 511 } 512 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org