linux-kernel - [PATCH tip/core/rcu 16/28] block,rcu: Convert call_rcu(disk_free_ptbl_rcu_cb) to kfree

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Message-Id: <1307561407-13809-16-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Wed,  8 Jun 2011 12:29:55 -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>,
	Jens Axboe <axboe@...nel.dk>
Subject: [PATCH tip/core/rcu 16/28] block,rcu: Convert call_rcu(disk_free_ptbl_rcu_cb) to kfree_rcu()

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

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

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Jens Axboe <axboe@...nel.dk>
Reviewed-by: Josh Triplett <josh@...htriplett.org>
---
 block/genhd.c |   10 +---------
 1 files changed, 1 insertions(+), 9 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 2dd9887..f076b5b 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -1018,14 +1018,6 @@ static const struct attribute_group *disk_attr_groups[] = {
 	NULL
 };
 
-static void disk_free_ptbl_rcu_cb(struct rcu_head *head)
-{
-	struct disk_part_tbl *ptbl =
-		container_of(head, struct disk_part_tbl, rcu_head);
-
-	kfree(ptbl);
-}
-
 /**
  * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way
  * @disk: disk to replace part_tbl for
@@ -1046,7 +1038,7 @@ static void disk_replace_part_tbl(struct gendisk *disk,
 
 	if (old_ptbl) {
 		rcu_assign_pointer(old_ptbl->last_lookup, NULL);
-		call_rcu(&old_ptbl->rcu_head, disk_free_ptbl_rcu_cb);
+		kfree_rcu(old_ptbl, rcu_head);
 	}
 }
 
-- 
1.7.3.2

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