Commit 206c1d32 authored by Filipe Manana's avatar Filipe Manana Committed by David Sterba
Browse files

btrfs: drop redundant bflags initialization when allocating extent buffer 



When allocating an extent buffer, at __alloc_extent_buffer(), there's no
point in explicitly assigning zero to the bflags field of the new extent
buffer because we allocated it with kmem_cache_zalloc().

So just remove the redundant initialization, it saves one mov instruction
in the generated assembly code for x86_64 ("movq $0x0,0x10(%rax)").

Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent b98c6cd5

fs/btrfs/extent_io.c

+0 −1
Original line number Diff line number Diff line
@@ -4266,7 +4266,6 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, 
	eb->start = start;

	eb->len = len;

	eb->fs_info = fs_info;

	eb->bflags = 0;

	init_rwsem(&eb->lock);



	btrfs_leak_debug_add_eb(eb);