Thansk,I know.
------------------
kedacomkernel
2012-03-14
-------------------------------------------------------------
发件人：NeilBrown
发送日期：2012-03-14 10:06:35
收件人：majianpeng
抄送：linux-raid
主题：Re: md:Add break if find.
On Tue, 13 Mar 2012 13:28:12 +0800 "majianpeng" <majianpeng@xxxxxxxxx> wrote:
> >From 6e04c2374db7fc34ccbf9f37f85e735a349c816c Mon Sep 17 00:00:00 2001
> From: majianpeng <majianpeng@xxxxxxxxx>
> Date: Tue, 13 Mar 2012 13:26:25 +0800
> Subject: [PATCH] md:Add break if find.
>
>
> Signed-off-by: majianpeng <majianpeng@xxxxxxxxx>
> ---
> drivers/md/raid5.c | 4 +++-
> 1 files changed, 3 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
> index 360f2b9..e05d9e5 100644
> --- a/drivers/md/raid5.c
> +++ b/drivers/md/raid5.c
> @@ -4369,8 +4369,10 @@ static inline sector_t sync_request(struct mddev *mddev, sector_t sector_nr, int
> * recovery aborts.
> */
> for (i = 0; i < conf->raid_disks; i++)
> - if (conf->disks[i].rdev == NULL)
> + if (conf->disks[i].rdev == NULL) {
> still_degraded = 1;
> + break;
> + }
>
> bitmap_start_sync(mddev->bitmap, sector_nr, &sync_blocks, still_degraded);
>
Thanks - however I don't think I'll apply this one.
It is a micro optimisation which only improve an uncommon case a little,
but it makes the source code long and the generated machine code longer (by
32 bytes on x86_64).
So I don't really think it is a win.
Thanks,
NeilBrown
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