mirrors/linux
2
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-13 18:49:22 -04:00
Code Issues Packages Projects Releases Wiki Activity

btrfs: avoid double slot decrement at btrfs_convert_free_space_to_extents()

Browse Source 
There's no need to subtract 1 from path->slots[0] and then decrement the
slot, we can reduce the generated assembly code by decrementing the slot
and then use it.

Module size before:

  $ size fs/btrfs/btrfs.ko
     text	   data	    bss	    dec	    hex	filename
  1846220	 162998	  16136	2025354	 1ee78a	fs/btrfs/btrfs.ko

Module size after:

  $ size fs/btrfs/btrfs.ko
     text	   data	    bss	    dec	    hex	filename
  1846204	 162998	  16136	2025338	 1ee77a	fs/btrfs/btrfs.ko

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana
2025-06-11 23:04:45 +01:00
committed by David Sterba
parent a8da443c9b
commit 497c726ff8
1 changed files with 2 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
fs/btrfs/free-space-tree.c
View File

@@ -406,12 +406,12 @@ int btrfs_convert_free_space_to_extents(struct btrfs_trans_handle *trans,
data_size = free_space_bitmap_size(fs_info,
found_key.offset);
ptr = btrfs_item_ptr_offset(leaf, path->slots[0] - 1);
path->slots[0]--;
ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
read_extent_buffer(leaf, bitmap_cursor, ptr,
data_size);
nr++;
path->slots[0]--;
} else {
ASSERT(0);
}