linux-kernel - [PATCH] kernel/user.c: add lock release annotation on free

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Date:	Mon, 27 Sep 2010 17:01:42 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Dhaval Giani <dhaval.giani@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] kernel/user.c: add lock release annotation on free_user()

free_user() releases uidhash_lock but was missing annotation.
Add it. This removes following sparse warnings:

 include/linux/spinlock.h:339:9: warning: context imbalance in 'free_user' - unexpected unlock
 kernel/user.c:120:6: warning: context imbalance in 'free_uid' - wrong count at exit

Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
 kernel/user.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/user.c b/kernel/user.c
index 7e72614..2c7d8d5 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -91,6 +91,7 @@ static struct user_struct *uid_hash_find(uid_t uid, struct hlist_head *hashent)
  * upon function exit.
  */
 static void free_user(struct user_struct *up, unsigned long flags)
+	__releases(&uidhash_lock)
 {
 	uid_hash_remove(up);
 	spin_unlock_irqrestore(&uidhash_lock, flags);
-- 
1.7.2.2

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