linux-kernel - [PATCH tip/core/rcu 26/28] sysctl,rcu: Convert call_rcu(free

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Message-Id: <1307561407-13809-26-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Wed,  8 Jun 2011 12:30:05 -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>
Subject: [PATCH tip/core/rcu 26/28] sysctl,rcu: Convert call_rcu(free_head) to kfree

The RCU callback free_head just calls kfree(), so we can use kfree_rcu()
instead of call_rcu().

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Reviewed-by: Josh Triplett <josh@...htriplett.org>
---
 kernel/sysctl.c |   11 +++--------
 1 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index c0bb324..39dbad0 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -1574,16 +1574,11 @@ void sysctl_head_get(struct ctl_table_header *head)
 	spin_unlock(&sysctl_lock);
 }
 
-static void free_head(struct rcu_head *rcu)
-{
-	kfree(container_of(rcu, struct ctl_table_header, rcu));
-}
-
 void sysctl_head_put(struct ctl_table_header *head)
 {
 	spin_lock(&sysctl_lock);
 	if (!--head->count)
-		call_rcu(&head->rcu, free_head);
+		kfree_rcu(head, rcu);
 	spin_unlock(&sysctl_lock);
 }
 
@@ -1955,10 +1950,10 @@ void unregister_sysctl_table(struct ctl_table_header * header)
 	start_unregistering(header);
 	if (!--header->parent->count) {
 		WARN_ON(1);
-		call_rcu(&header->parent->rcu, free_head);
+		kfree_rcu(header->parent, rcu);
 	}
 	if (!--header->count)
-		call_rcu(&header->rcu, free_head);
+		kfree_rcu(header, rcu);
 	spin_unlock(&sysctl_lock);
 }
 
-- 
1.7.3.2

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