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[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>
This commit is contained in:
Jesper Juhl 2006-01-09 20:54:44 -08:00 committed by Linus Torvalds
parent 3795e1616f
commit 352d768b19
1 changed files with 4 additions and 3 deletions
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7
drivers/md/multipath.c
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@ -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);