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btrfs: drop redundant bflags initialization when allocating extent buffer

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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: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2022-10-11 13:16:58 +01:00 committed by David Sterba
parent b98c6cd59e
commit 206c1d32f3
1 changed files with 0 additions and 1 deletions
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fs/btrfs/extent_io.c
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@ -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);