locking/qrwlock: Rename ->lock to ->wait_lock

... trivial, but reads a little nicer when we name our
actual primitive 'lock'.

Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Waiman Long <Waiman.Long@hpe.com>
Link: http://lkml.kernel.org/r/1442216244-4409-1-git-send-email-dave@stgolabs.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

include/asm-generic/qrwlock_types.h

@@ -10,12 +10,12 @@
 
 typedef struct qrwlock {
 	atomic_t		cnts;
-	arch_spinlock_t		lock;
+	arch_spinlock_t		wait_lock;
 } arch_rwlock_t;
 
 #define	__ARCH_RW_LOCK_UNLOCKED {		\
 	.cnts = ATOMIC_INIT(0),			\
-	.lock = __ARCH_SPIN_LOCK_UNLOCKED,	\
+	.wait_lock = __ARCH_SPIN_LOCK_UNLOCKED,	\
 }
 
 #endif /* __ASM_GENERIC_QRWLOCK_TYPES_H */

kernel/locking/qrwlock.c

@@ -86,7 +86,7 @@ void queued_read_lock_slowpath(struct qrwlock *lock, u32 cnts)
 	/*
 	 * Put the reader into the wait queue
 	 */
-	arch_spin_lock(&lock->lock);
+	arch_spin_lock(&lock->wait_lock);
 
 	/*
 	 * The ACQUIRE semantics of the following spinning code ensure
@@ -99,7 +99,7 @@ void queued_read_lock_slowpath(struct qrwlock *lock, u32 cnts)
 	/*
 	 * Signal the next one in queue to become queue head
 	 */
-	arch_spin_unlock(&lock->lock);
+	arch_spin_unlock(&lock->wait_lock);
 }
 EXPORT_SYMBOL(queued_read_lock_slowpath);
 
@@ -112,7 +112,7 @@ void queued_write_lock_slowpath(struct qrwlock *lock)
 	u32 cnts;
 
 	/* Put the writer into the wait queue */
-	arch_spin_lock(&lock->lock);
+	arch_spin_lock(&lock->wait_lock);
 
 	/* Try to acquire the lock directly if no reader is present */
 	if (!atomic_read(&lock->cnts) &&
@@ -144,6 +144,6 @@ void queued_write_lock_slowpath(struct qrwlock *lock)
 		cpu_relax_lowlatency();
 	}
 unlock:
-	arch_spin_unlock(&lock->lock);
+	arch_spin_unlock(&lock->wait_lock);
 }
 EXPORT_SYMBOL(queued_write_lock_slowpath);