diff options
| author | Jesper Juhl <jesper.juhl@gmail.com> | 2006-01-09 20:54:44 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-10 08:02:01 -0800 |
| commit | 352d768b19408d3c019a3fa09fd5bfed99a55bc6 (patch) | |
| tree | 1e3aee2364e1a9a610b05cab8c468f4647c1df31 | |
| parent | 3795e1616f16905889761536cdc266ebc51855e5 (diff) | |
| download | op-kernel-dev-352d768b19408d3c019a3fa09fd5bfed99a55bc6.zip op-kernel-dev-352d768b19408d3c019a3fa09fd5bfed99a55bc6.tar.gz | |
[PATCH] Decrease number of pointer derefs in multipath.c
Decrease the number of pointer derefs in drivers/md/multipath.c
Benefits of the patch:
- Fewer pointer dereferences should make the code slightly faster.
- Size of generated code is smaller
- improved readability
Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: Alasdair G Kergon <agk@redhat.com>
Acked-by: NeilBrown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | drivers/md/multipath.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/md/multipath.c b/drivers/md/multipath.c index e6aa309..96f7af4 100644 --- a/drivers/md/multipath.c +++ b/drivers/md/multipath.c @@ -303,6 +303,7 @@ static void print_multipath_conf (multipath_conf_t *conf) static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) { multipath_conf_t *conf = mddev->private; + struct request_queue *q; int found = 0; int path; struct multipath_info *p; @@ -311,8 +312,8 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) for (path=0; path<mddev->raid_disks; path++) if ((p=conf->multipaths+path)->rdev == NULL) { - blk_queue_stack_limits(mddev->queue, - rdev->bdev->bd_disk->queue); + q = rdev->bdev->bd_disk->queue; + blk_queue_stack_limits(mddev->queue, q); /* as we don't honour merge_bvec_fn, we must never risk * violating it, so limit ->max_sector to one PAGE, as @@ -320,7 +321,7 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev) * (Note: it is very unlikely that a device with * merge_bvec_fn will be involved in multipath.) */ - if (rdev->bdev->bd_disk->queue->merge_bvec_fn && + if (q->merge_bvec_fn && mddev->queue->max_sectors > (PAGE_SIZE>>9)) blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9); |
