[PATCH 1/2] locking/mutex: Clean up mutex.h

[Waiman Long <longman@redhat.com>]

CONFIG_DEBUG_MUTEXES and CONFIG_PREEMPT_RT are mutually exclusive. They
can't be both set at the same time.  Move down the mutex_destroy()
function declaration to the bottom of mutex.h to eliminate duplicated
mutex_destroy() declaration.

Also remove the duplicated mutex_trylock() function declaration in the
CONFIG_PREEMPT_RT section.

Signed-off-by: Waiman Long <longman@redhat.com>
---
 include/linux/mutex.h | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

diff --git a/include/linux/mutex.h b/include/linux/mutex.h
index a33aa9eb9fc3..f3ae911580bf 100644
--- a/include/linux/mutex.h
+++ b/include/linux/mutex.h
@@ -77,18 +77,10 @@ struct mutex {
 };
 
 #ifdef CONFIG_DEBUG_MUTEXES
-
-#define __DEBUG_MUTEX_INITIALIZER(lockname)				\
+# define __DEBUG_MUTEX_INITIALIZER(lockname)				\
 	, .magic = &lockname
-
-extern void mutex_destroy(struct mutex *lock);
-
 #else
-
 # define __DEBUG_MUTEX_INITIALIZER(lockname)
-
-static inline void mutex_destroy(struct mutex *lock) {}
-
 #endif
 
 /**
@@ -151,9 +143,6 @@ struct mutex {
 
 extern void __mutex_rt_init(struct mutex *lock, const char *name,
 			    struct lock_class_key *key);
-extern int mutex_trylock(struct mutex *lock);
-
-static inline void mutex_destroy(struct mutex *lock) { }
 
 #define mutex_is_locked(l)	rt_mutex_base_is_locked(&(l)->rtmutex)
 
@@ -220,6 +209,16 @@ extern void mutex_unlock(struct mutex *lock);
 
 extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock);
 
+#ifdef CONFIG_DEBUG_MUTEXES
+
+extern void mutex_destroy(struct mutex *lock);
+
+#else
+
+static inline void mutex_destroy(struct mutex *lock) {}
+
+#endif
+
 DEFINE_GUARD(mutex, struct mutex *, mutex_lock(_T), mutex_unlock(_T))
 DEFINE_FREE(mutex, struct mutex *, if (_T) mutex_unlock(_T))
 
-- 
2.39.3