From: Jens Axboe <jens.axboe@oracle.com>
Date: Tue, 29 Apr 2008 19:31:27 +0000 (+0200)
Subject: Improve queue_is_locked()
X-Git-Tag: v3.12-rc1~21234
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=7663c1e2792a9662b23dec6e19bfcd3d55360b8f;p=kernel%2Fkernel-generic.git

Improve queue_is_locked()

spin_is_locked() doesn't work on UP without spinlock debugging. Make it
safer and just return 1 on UP, so we don't get false positives. The plan
is to kill this debug function during the -rc cycle.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 95864b3..d2a1b71 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -412,8 +412,12 @@ struct request_queue
 
 static inline int queue_is_locked(struct request_queue *q)
 {
+#ifdef CONFIG_SMP
 	spinlock_t *lock = q->queue_lock;
 	return lock && spin_is_locked(lock);
+#else
+	return 1;
+#endif
 }
 
 static inline void queue_flag_set_unlocked(unsigned int flag,