[patch V4 40/68] locking/ww_mutex: Split up ww_mutex_unlock()

[Thomas Gleixner]

From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>

Split the ww related part out into a helper function so it can be reused
for a rtmutex based ww_mutex implementation.

Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>

---
 kernel/locking/mutex.c |   26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)
---
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -750,19 +750,7 @@ EXPORT_SYMBOL(mutex_unlock);
  */
 void __sched ww_mutex_unlock(struct ww_mutex *lock)
 {
-	/*
-	 * The unlocking fastpath is the 0->1 transition from 'locked'
-	 * into 'unlocked' state:
-	 */
-	if (lock->ctx) {
-#ifdef CONFIG_DEBUG_MUTEXES
-		DEBUG_LOCKS_WARN_ON(!lock->ctx->acquired);
-#endif
-		if (lock->ctx->acquired > 0)
-			lock->ctx->acquired--;
-		lock->ctx = NULL;
-	}
-
+	__ww_mutex_unlock(lock);
 	mutex_unlock(&lock->base);
 }
 EXPORT_SYMBOL(ww_mutex_unlock);
@@ -915,6 +903,18 @@ static inline int __sched
 	return 0;
 }
 
+static void __ww_mutex_unlock(struct ww_mutex *lock)
+{
+	if (lock->ctx) {
+#ifdef CONFIG_DEBUG_MUTEXES
+		DEBUG_LOCKS_WARN_ON(!lock->ctx->acquired);
+#endif
+		if (lock->ctx->acquired > 0)
+			lock->ctx->acquired--;
+		lock->ctx = NULL;
+	}
+}
+
 /*
  * Lock a mutex (possibly interruptible), slowpath:
  */