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btrfs: switch cached fs_info::csum_size from u16 to u32

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The fs_info value is 32bit, switch also the local u16 variables. This
leads to a better assembly code generated due to movzwl.

This simple change will shave some bytes on x86_64 and release config:

   text    data     bss     dec     hex filename
1090000   17980   14912 1122892  11224c pre/btrfs.ko
1089794   17980   14912 1122686  11217e post/btrfs.ko

DELTA: -206

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2020-07-02 11:27:30 +02:00
parent 55fc29bed8
commit 223486c27b
9 changed files with 18 additions and 20 deletions
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2
fs/btrfs/disk-io.c
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@ -454,7 +454,7 @@ static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page)
u64 start = page_offset(page);
u64 found_start;
u8 result[BTRFS_CSUM_SIZE];
const u16 csum_size = fs_info->csum_size;
const u32 csum_size = fs_info->csum_size;
struct extent_buffer *eb;
int ret;