linux-kernel - [PATCH 30/28] kernel/user.c: add lock release annotation on free

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Date:	Fri, 11 Feb 2011 07:07:01 +0100
From:	Mike Galbraith <efault@....de>
To:	Dhaval Giani <dhaval.giani@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 30/28] kernel/user.c: add lock release annotation on
 free_user()

On Thu, 2011-02-10 at 19:35 +0100, Dhaval Giani wrote:
> >
> > There were a few more patches after this which cleaned up a few things
> > as well. Let me search them out and let you know the commit IDs.
> >

> 571428be550fbe37160596995e96ad398873fcbd

From: Namhyung Kim <namhyung@...il.com>
Date: Tue, 26 Oct 2010 14:22:43 -0700
Subject: kernel/user.c: add lock release annotation on free_user()


commit 571428be550fbe37160596995e96ad398873fcbd upstream.

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>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Dhaval Giani <dhaval.giani@...il.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Mike Galbraith <efault@....de>

---
 kernel/user.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/user.c b/kernel/user.c
index 8e1c8c0..1b91701 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);


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