Hi Chandan, [auto build test ERROR on tip/perf/core] [also build test ERROR on v4.6-rc3 next-20160414] [cannot apply to btrfs/next] [if your patch is applied to the wrong git tree, please drop us a note to help improving the system] url: https://github.com/0day-ci/linux/commits/Chandan-Rajendra/Allow-I-O-on-blocks-whose-size-is-less-than-page-size/20160414-214339 config: arm-allyesconfig (attached as .config) reproduce: wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # save the attached .config to linux build tree make.cross ARCH=arm Note: the linux-review/Chandan-Rajendra/Allow-I-O-on-blocks-whose-size-is-less-than-page-size/20160414-214339 HEAD cb75f40d8b4d47c9133c24f3cc01b3eef831bf19 builds fine. It only hurts bisectibility. All error/warnings (new ones prefixed by >>): fs/btrfs/file.c: In function 'btrfs_punch_hole': >> fs/btrfs/file.c:2435:29: error: 'PAGE_CACHE_SHIFT' undeclared (first use in this function) start_index = lockstart >> PAGE_CACHE_SHIFT; ^ fs/btrfs/file.c:2435:29: note: each undeclared identifier is reported only once for each function it appears in >> fs/btrfs/file.c:2449:20: error: 'PAGE_CACHE_SIZE' undeclared (first use in this function) if (lockstart & (PAGE_CACHE_SIZE - 1)) { ^ >> fs/btrfs/file.c:2464:6: error: implicit declaration of function 'page_cache_release' [-Werror=implicit-function-declaration] page_cache_release(start_page); ^ In file included from include/linux/list.h:8:0, from include/linux/wait.h:6, from include/linux/fs.h:5, from fs/btrfs/file.c:19: include/linux/kernel.h:735:17: warning: comparison of distinct pointer types lacks a cast (void) (&_min1 == &_min2); \ ^ >> fs/btrfs/file.c:2491:5: note: in expansion of macro 'min' min(lockstart + PAGE_CACHE_SIZE - 1, lockend), 0)) && ^ cc1: some warnings being treated as errors vim +/PAGE_CACHE_SHIFT +2435 fs/btrfs/file.c 2429 2430 if (lockend < lockstart) { 2431 ret = 0; 2432 goto out_only_mutex; 2433 } 2434 > 2435 start_index = lockstart >> PAGE_CACHE_SHIFT; 2436 end_index = lockend >> PAGE_CACHE_SHIFT; 2437 2438 same_page = lockstart >> PAGE_CACHE_SHIFT 2439 == lockend >> PAGE_CACHE_SHIFT; 2440 2441 while (1) { 2442 struct btrfs_ordered_extent *ordered; 2443 struct page *start_page = NULL; 2444 struct page *end_page = NULL; 2445 u64 nr_pages; 2446 2447 truncate_pagecache_range(inode, lockstart, lockend); 2448 > 2449 if (lockstart & (PAGE_CACHE_SIZE - 1)) { 2450 start_page = find_or_create_page(mapping, start_index, 2451 GFP_NOFS); 2452 if (!start_page) { 2453 mutex_unlock(&inode->i_mutex); 2454 return -ENOMEM; 2455 } 2456 } 2457 2458 if (!same_page && ((lockend + 1) & (PAGE_CACHE_SIZE - 1))) { 2459 end_page = find_or_create_page(mapping, end_index, 2460 GFP_NOFS); 2461 if (!end_page) { 2462 if (start_page) { 2463 unlock_page(start_page); > 2464 page_cache_release(start_page); 2465 } 2466 mutex_unlock(&inode->i_mutex); 2467 return -ENOMEM; 2468 } 2469 } 2470 2471 2472 lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, 2473 &cached_state); 2474 ordered = btrfs_lookup_first_ordered_extent(inode, lockend); 2475 2476 /* 2477 * We need to make sure we have no ordered extents in this range 2478 * and nobody raced in and read a page in this range, if we did 2479 * we need to try again. 2480 */ 2481 nr_pages = round_up(lockend, PAGE_CACHE_SIZE) 2482 - round_down(lockstart, PAGE_CACHE_SIZE); 2483 nr_pages >>= PAGE_CACHE_SHIFT; 2484 2485 if ((!ordered || 2486 (ordered->file_offset + ordered->len <= lockstart || 2487 ordered->file_offset > lockend)) && 2488 (!(start_page && PagePrivate(start_page) && 2489 test_page_blks_state(start_page, 1 << BLK_STATE_UPTODATE, 2490 lockstart, > 2491 min(lockstart + PAGE_CACHE_SIZE - 1, lockend), 0)) && 2492 !(end_page && PagePrivate(end_page) && 2493 test_page_blks_state(end_page, 1 << BLK_STATE_UPTODATE, 2494 page_offset(end_page), lockend, 0)) && --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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