On Mon, Nov 09, 2015 at 10:31:22PM +0800, Jia He wrote:
> If there is any non zero bit in a long bitmap, it can jump out of the for
> loop and finish the function as soon as possible.
>
> Signed-off-by: Jia He <hejianet@xxxxxxxxx>
> Cc: Dave Chinner <david@xxxxxxxxxxxxx>
> Cc: Brian Foster <bfoster@xxxxxxxxxx>
> ---
> fs/xfs/libxfs/xfs_bit.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/fs/xfs/libxfs/xfs_bit.c b/fs/xfs/libxfs/xfs_bit.c
> index 0e8885a..84614b0 100644
> --- a/fs/xfs/libxfs/xfs_bit.c
> +++ b/fs/xfs/libxfs/xfs_bit.c
> @@ -36,6 +36,8 @@ xfs_bitmap_empty(uint *map, uint size)
>
> for (i = 0; i < size; i++) {
> ret |= map[i];
> + if (ret != 0)
> + return 0;
> }
>
Seems Ok to me, but if we're going to do this, why not just kill ret
entirely? For example, check 'if (map[i] != 0) return 0;' in the loop
and unconditionally return 1 if we make it to the end.
Brian
> return (ret == 0);
> --
> 2.5.0
>
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