linux-kernel - [PATCH tip/core/rcu 18/28] jbd2,rcu: Convert call_rcu(free_devcache) to kfree

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Message-Id: <1307561407-13809-18-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Wed,  8 Jun 2011 12:29:57 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	patches@...aro.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Jan Kara <jack@...e.cz>
Subject: [PATCH tip/core/rcu 18/28] jbd2,rcu: Convert call_rcu(free_devcache) to kfree_rcu()

From: Lai Jiangshan <laijs@...fujitsu.com>

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

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Jan Kara <jack@...e.cz>
Reviewed-by: Josh Triplett <josh@...htriplett.org>
---
 fs/jbd2/journal.c |    7 +------
 1 files changed, 1 insertions(+), 6 deletions(-)

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index e0ec3db..13fb464 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -2390,11 +2390,6 @@ struct devname_cache {
 static struct devname_cache *devcache[1 << CACHE_SIZE_BITS];
 static DEFINE_SPINLOCK(devname_cache_lock);
 
-static void free_devcache(struct rcu_head *rcu)
-{
-	kfree(rcu);
-}
-
 const char *jbd2_dev_to_name(dev_t device)
 {
 	int	i = hash_32(device, CACHE_SIZE_BITS);
@@ -2423,7 +2418,7 @@ const char *jbd2_dev_to_name(dev_t device)
 			spin_unlock(&devname_cache_lock);
 			return ret;
 		}
-		call_rcu(&devcache[i]->rcu, free_devcache);
+		kfree_rcu(devcache[i], rcu);
 	}
 	devcache[i] = new_dev;
 	devcache[i]->device = device;
-- 
1.7.3.2

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