From: Mikulas Patocka <mpatocka@redhat.com>
Date: Fri, 21 Dec 2012 20:23:33 +0000 (+0000)
Subject: dm snapshot: optimize track_chunk
X-Git-Tag: v3.8-rc1~3^2~25
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9aa0c0e60ffc2594acaad23127dbea9f3b61821c;p=platform%2Fkernel%2Flinux-exynos.git

dm snapshot: optimize track_chunk

track_chunk is always called with interrupts enabled. Consequently, we
do not need to save and restore interrupt state in "flags" variable.
This patch changes spin_lock_irqsave to spin_lock_irq and
spin_unlock_irqrestore to spin_unlock_irq.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
---

diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c
index a143921..223e7eb 100644
--- a/drivers/md/dm-snap.c
+++ b/drivers/md/dm-snap.c
@@ -198,14 +198,13 @@ static struct dm_snap_tracked_chunk *track_chunk(struct dm_snapshot *s,
 {
 	struct dm_snap_tracked_chunk *c = mempool_alloc(s->tracked_chunk_pool,
 							GFP_NOIO);
-	unsigned long flags;
 
 	c->chunk = chunk;
 
-	spin_lock_irqsave(&s->tracked_chunk_lock, flags);
+	spin_lock_irq(&s->tracked_chunk_lock);
 	hlist_add_head(&c->node,
 		       &s->tracked_chunk_hash[DM_TRACKED_CHUNK_HASH(chunk)]);
-	spin_unlock_irqrestore(&s->tracked_chunk_lock, flags);
+	spin_unlock_irq(&s->tracked_chunk_lock);
 
 	return c;
 }