[PATCH 12/17] block, rcu: convert call_rcu(cfq_cfqd_free) to kfree_rcu()

[Lai Jiangshan <laijs-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>]

The rcu callback cfq_cfqd_free() just calls a kfree(),
so we use kfree_rcu() instead of the call_rcu(cfq_cfqd_free).

Signed-off-by: Lai Jiangshan <laijs-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>
---
 block/cfq-iosched.c |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index ea83a4f..32fe43e 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -3812,11 +3812,6 @@ static void cfq_put_async_queues(struct cfq_data *cfqd)
 		cfq_put_queue(cfqd->async_idle_cfqq);
 }
 
-static void cfq_cfqd_free(struct rcu_head *head)
-{
-	kfree(container_of(head, struct cfq_data, rcu));
-}
-
 static void cfq_exit_queue(struct elevator_queue *e)
 {
 	struct cfq_data *cfqd = e->elevator_data;
@@ -3850,7 +3845,7 @@ static void cfq_exit_queue(struct elevator_queue *e)
 	spin_unlock(&cic_index_lock);
 
 	/* Wait for cfqg->blkg->key accessors to exit their grace periods. */
-	call_rcu(&cfqd->rcu, cfq_cfqd_free);
+	kfree_rcu(cfqd, rcu);
 }
 
 static int cfq_alloc_cic_index(void)
-- 
1.7.4