4 files changed, 16 insertions, 18 deletions

diff --git a/include/asm-generic/qrwlock.h b/include/asm-generic/qrwlock.h
index 0f7062bd55e5..36254d2da8e0 100644
--- a/include/asm-generic/qrwlock.h
+++ b/include/asm-generic/qrwlock.h
@@ -71,8 +71,8 @@ static inline int queued_write_trylock(struct qrwlock *lock)
 	if (unlikely(cnts))
 		return 0;
 
-	return likely(atomic_cmpxchg_acquire(&lock->cnts,
-					     cnts, cnts | _QW_LOCKED) == cnts);
+	return likely(atomic_try_cmpxchg_acquire(&lock->cnts, &cnts,
+				_QW_LOCKED));
 }
 /**
  * queued_read_lock - acquire read lock of a queue rwlock
@@ -96,8 +96,9 @@ static inline void queued_read_lock(struct qrwlock *lock)
  */
 static inline void queued_write_lock(struct qrwlock *lock)
 {
+	u32 cnts = 0;
 	/* Optimize for the unfair lock case where the fair flag is 0. */
-	if (atomic_cmpxchg_acquire(&lock->cnts, 0, _QW_LOCKED) == 0)
+	if (likely(atomic_try_cmpxchg_acquire(&lock->cnts, &cnts, _QW_LOCKED)))
 		return;
 
 	queued_write_lock_slowpath(lock);
diff --git a/include/asm-generic/qspinlock.h b/include/asm-generic/qspinlock.h
index 9cc457597ddf..7541fa707f5b 100644
--- a/include/asm-generic/qspinlock.h
+++ b/include/asm-generic/qspinlock.h
@@ -66,10 +66,12 @@ static __always_inline int queued_spin_is_contended(struct qspinlock *lock)
  */
 static __always_inline int queued_spin_trylock(struct qspinlock *lock)
 {
-	if (!atomic_read(&lock->val) &&
-	   (atomic_cmpxchg_acquire(&lock->val, 0, _Q_LOCKED_VAL) == 0))
-		return 1;
-	return 0;
+	u32 val = atomic_read(&lock->val);
+
+	if (unlikely(val))
+		return 0;
+
+	return likely(atomic_try_cmpxchg_acquire(&lock->val, &val, _Q_LOCKED_VAL));
 }
 
 extern void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val);
@@ -80,11 +82,11 @@ extern void queued_spin_lock_slowpath(struct qspinlock *lock, u32 val);
  */
 static __always_inline void queued_spin_lock(struct qspinlock *lock)
 {
-	u32 val;
+	u32 val = 0;
 
-	val = atomic_cmpxchg_acquire(&lock->val, 0, _Q_LOCKED_VAL);
-	if (likely(val == 0))
+	if (likely(atomic_try_cmpxchg_acquire(&lock->val, &val, _Q_LOCKED_VAL)))
 		return;
+
 	queued_spin_lock_slowpath(lock, val);
 }
 
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index b0d0b51c4d85..1fd82ff99c65 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -99,13 +99,8 @@ struct lock_class {
 	 */
 	unsigned int			version;
 
-	/*
-	 * Statistics counter:
-	 */
-	unsigned long			ops;
-
-	const char			*name;
 	int				name_version;
+	const char			*name;
 
 #ifdef CONFIG_LOCK_STAT
 	unsigned long			contention_point[LOCKSTAT_POINTS];
diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index ab93b6eae696..67dbb57508b1 100644
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -45,10 +45,10 @@ struct rw_semaphore {
 };
 
 /*
- * Setting bit 0 of the owner field with other non-zero bits will indicate
+ * Setting bit 1 of the owner field but not bit 0 will indicate
  * that the rwsem is writer-owned with an unknown owner.
  */
-#define RWSEM_OWNER_UNKNOWN	((struct task_struct *)-1L)
+#define RWSEM_OWNER_UNKNOWN	((struct task_struct *)-2L)
 
 extern struct rw_semaphore *rwsem_down_read_failed(struct rw_semaphore *sem);
 extern struct rw_semaphore *rwsem_down_read_failed_killable(struct rw_semaphore *sem);