There is but a single user and the previous patch mandates slowfn must
be rt_mutex_slowunlock(), so fold the lot together and save a few
lines.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 kernel/locking/rtmutex.c |   29 ++++++++++-------------------
 1 file changed, 10 insertions(+), 19 deletions(-)

--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -1377,24 +1377,6 @@ rt_mutex_fasttrylock(struct rt_mutex *lo
 	return slowfn(lock);
 }
 
-static inline void
-rt_mutex_fastunlock(struct rt_mutex *lock,
-		    bool (*slowfn)(struct rt_mutex *lock,
-				   struct wake_q_head *wqh))
-{
-	WAKE_Q(wake_q);
-
-	if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) {
-		rt_mutex_deadlock_account_unlock(current);
-
-	} else {
-		bool deboost = slowfn(lock, &wake_q);
-
-		rt_mutex_postunlock(&wake_q, deboost);
-	}
-}
-
-
 /*
  * Undo pi boosting (if necessary) and wake top waiter.
  */
@@ -1501,7 +1483,16 @@ EXPORT_SYMBOL_GPL(rt_mutex_trylock);
  */
 void __sched rt_mutex_unlock(struct rt_mutex *lock)
 {
-	rt_mutex_fastunlock(lock, rt_mutex_slowunlock);
+	WAKE_Q(wake_q);
+
+	if (likely(rt_mutex_cmpxchg_release(lock, current, NULL))) {
+		rt_mutex_deadlock_account_unlock(current);
+
+	} else {
+		bool deboost = rt_mutex_slowunlock(lock, &wake_q);
+
+		rt_mutex_postunlock(&wake_q, deboost);
+	}
 }
 EXPORT_SYMBOL_GPL(rt_mutex_unlock);