dm-snap: 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@xxxxxxxxxx>
---
drivers/md/dm-snap.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
Index: linux-3.6.2-fast/drivers/md/dm-snap.c
===================================================================
--- linux-3.6.2-fast.orig/drivers/md/dm-snap.c 2012-10-17 00:43:01.000000000 +0200
+++ linux-3.6.2-fast/drivers/md/dm-snap.c 2012-10-17 00:43:22.000000000 +0200
@@ -201,14 +201,13 @@ static struct dm_snap_tracked_chunk *tra
{
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;
}
--
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