diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2012-12-21 20:23:33 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-12-21 20:23:33 +0000 |
| commit | 9aa0c0e60ffc2594acaad23127dbea9f3b61821c (patch) | |
| tree | 4464d72c53cc977dea9ddf071ed8d88ee6c312d9 /drivers/md/dm-snap.c | |
| parent | 19cbbc60c680e2e404bf55458ad2c4ff60d16076 (diff) | |
| download | lwn-9aa0c0e60ffc2594acaad23127dbea9f3b61821c.tar.gz lwn-9aa0c0e60ffc2594acaad23127dbea9f3b61821c.zip | |
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>
Diffstat (limited to 'drivers/md/dm-snap.c')
| -rw-r--r-- | drivers/md/dm-snap.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/md/dm-snap.c b/drivers/md/dm-snap.c index a143921feaf6..223e7ebf24f7 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; } |