Hi, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on kdave/for-next] [also build test WARNING on v5.7 next-20200608] [cannot apply to btrfs/next] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/fdmanana-kernel-org/Btrfs-remove... base: https://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next config: nios2-allyesconfig (attached as .config) compiler: nios2-linux-gcc (GCC) 9.3.0 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 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=nios2 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 >>, old ones prefixed by <<): In file included from fs/btrfs/relocation.c:13: fs/btrfs/ctree.h:2216:8: warning: type qualifiers ignored on function return type [-Wignored-qualifiers] 2216 | size_t __const btrfs_get_num_csums(void); | ^~~~~~~ fs/btrfs/relocation.c: In function 'prealloc_file_extent_cluster': 2587 | u64 cur_offset; | ^~~~~~~~~~ vim +/cur_offset +2587 fs/btrfs/relocation.c 5d4f98a28c7d33 Yan Zheng 2009-06-10 2574 efa56464562991 Yan, Zheng 2010-05-16 2575 static noinline_for_stack efa56464562991 Yan, Zheng 2010-05-16 2576 int prealloc_file_extent_cluster(struct inode *inode, efa56464562991 Yan, Zheng 2010-05-16 2577 struct file_extent_cluster *cluster) efa56464562991 Yan, Zheng 2010-05-16 2578 { efa56464562991 Yan, Zheng 2010-05-16 2579 u64 alloc_hint = 0; efa56464562991 Yan, Zheng 2010-05-16 2580 u64 start; efa56464562991 Yan, Zheng 2010-05-16 2581 u64 end; efa56464562991 Yan, Zheng 2010-05-16 2582 u64 offset = BTRFS_I(inode)->index_cnt; efa56464562991 Yan, Zheng 2010-05-16 2583 u64 num_bytes; efa56464562991 Yan, Zheng 2010-05-16 2584 int nr = 0; efa56464562991 Yan, Zheng 2010-05-16 2585 int ret = 0; dcb40c196fc85c Wang Xiaoguang 2016-07-25 2586 u64 prealloc_start = cluster->start - offset; 18513091af9483 Wang Xiaoguang 2016-07-25 @2587 u64 cur_offset; eb4d9ef455539b Filipe Manana 2020-06-09 2588 u64 allocated = 0; efa56464562991 Yan, Zheng 2010-05-16 2589 efa56464562991 Yan, Zheng 2010-05-16 2590 BUG_ON(cluster->start != cluster->boundary[0]); 5955102c9984fa Al Viro 2016-01-22 2591 inode_lock(inode); efa56464562991 Yan, Zheng 2010-05-16 2592 8fa95e39f0371b Filipe Manana 2020-06-09 2593 ret = btrfs_alloc_data_chunk_ondemand(BTRFS_I(inode), eb4d9ef455539b Filipe Manana 2020-06-09 2594 cluster->total_bytes); efa56464562991 Yan, Zheng 2010-05-16 2595 if (ret) efa56464562991 Yan, Zheng 2010-05-16 2596 goto out; efa56464562991 Yan, Zheng 2010-05-16 2597 18513091af9483 Wang Xiaoguang 2016-07-25 2598 cur_offset = prealloc_start; efa56464562991 Yan, Zheng 2010-05-16 2599 while (nr < cluster->nr) { efa56464562991 Yan, Zheng 2010-05-16 2600 start = cluster->boundary[nr] - offset; efa56464562991 Yan, Zheng 2010-05-16 2601 if (nr + 1 < cluster->nr) efa56464562991 Yan, Zheng 2010-05-16 2602 end = cluster->boundary[nr + 1] - 1 - offset; efa56464562991 Yan, Zheng 2010-05-16 2603 else efa56464562991 Yan, Zheng 2010-05-16 2604 end = cluster->end - offset; efa56464562991 Yan, Zheng 2010-05-16 2605 d0082371cf086e Jeff Mahoney 2012-03-01 2606 lock_extent(&BTRFS_I(inode)->io_tree, start, end); efa56464562991 Yan, Zheng 2010-05-16 2607 num_bytes = end + 1 - start; efa56464562991 Yan, Zheng 2010-05-16 2608 ret = btrfs_prealloc_file_range(inode, 0, start, efa56464562991 Yan, Zheng 2010-05-16 2609 num_bytes, num_bytes, efa56464562991 Yan, Zheng 2010-05-16 2610 end + 1, &alloc_hint); 18513091af9483 Wang Xiaoguang 2016-07-25 2611 cur_offset = end + 1; eb4d9ef455539b Filipe Manana 2020-06-09 2612 allocated += num_bytes; d0082371cf086e Jeff Mahoney 2012-03-01 2613 unlock_extent(&BTRFS_I(inode)->io_tree, start, end); efa56464562991 Yan, Zheng 2010-05-16 2614 if (ret) efa56464562991 Yan, Zheng 2010-05-16 2615 break; efa56464562991 Yan, Zheng 2010-05-16 2616 nr++; efa56464562991 Yan, Zheng 2010-05-16 2617 } eb4d9ef455539b Filipe Manana 2020-06-09 2618 if (allocated < cluster->total_bytes) 8fa95e39f0371b Filipe Manana 2020-06-09 2619 btrfs_free_reserved_data_space_noquota(inode, eb4d9ef455539b Filipe Manana 2020-06-09 2620 cluster->total_bytes - allocated); efa56464562991 Yan, Zheng 2010-05-16 2621 out: 5955102c9984fa Al Viro 2016-01-22 2622 inode_unlock(inode); efa56464562991 Yan, Zheng 2010-05-16 2623 return ret; efa56464562991 Yan, Zheng 2010-05-16 2624 } efa56464562991 Yan, Zheng 2010-05-16 2625 :::::: The code at line 2587 was first introduced by commit :::::: 18513091af9483ba84328d42092bd4d42a3c958f btrfs: update btrfs_space_info's bytes_may_use timely :::::: TO: Wang Xiaoguang <wangxg.fnst(a)cn.fujitsu.com&gt; :::::: CC: Chris Mason <clm(a)fb.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org