md/raid5: Don't read ->active_stripes if it's not needed
The atomic_read() is not needed in many cases so only do
the read after the first checks are done.
Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Song Liu <song@kernel.org>
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 84f9418..e0514bd 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -789,15 +789,14 @@ struct stripe_request_ctx {
*/
static bool is_inactive_blocked(struct r5conf *conf, int hash)
{
- int active = atomic_read(&conf->active_stripes);
-
if (list_empty(conf->inactive_list + hash))
return false;
if (!test_bit(R5_INACTIVE_BLOCKED, &conf->cache_state))
return true;
- return active < (conf->max_nr_stripes * 3 / 4);
+ return (atomic_read(&conf->active_stripes) <
+ (conf->max_nr_stripes * 3 / 4));
}
struct stripe_head *raid5_get_active_stripe(struct r5conf *conf,
