-extern void downgrade_write(struct rw_semaphore *sem);
-
-#ifdef CONFIG_DEBUG_LOCK_ALLOC
-/*
- * nested locking. NOTE: rwsems are not allowed to recurse
- * (which occurs if the same task tries to acquire the same
- * lock instance multiple times), but multiple locks of the
- * same lock class might be taken, if the order of the locks
- * is always the same. This ordering rule can be expressed
- * to lockdep via the _nested() APIs, but enumerating the
- * subclasses that are used. (If the nesting relationship is
- * static then another method for expressing nested locking is
- * the explicit definition of lock class keys and the use of
- * lockdep_set_class() at lock initialization time.
- * See Documentation/lockdep-design.txt for more details.)
- */
-extern void down_read_nested(struct rw_semaphore *sem, int subclass);
-extern void down_write_nested(struct rw_semaphore *sem, int subclass);
-/*
- * Take/release a lock when not the owner will release it.
- *
- * [ This API should be avoided as much as possible - the
- * proper abstraction for this case is completions. ]
- */
-extern void down_read_non_owner(struct rw_semaphore *sem);
-extern void up_read_non_owner(struct rw_semaphore *sem);
-#else
-# define down_read_nested(sem, subclass) down_read(sem)
-# define down_write_nested(sem, subclass) down_write(sem)
-# define down_read_non_owner(sem) down_read(sem)
-# define up_read_non_owner(sem) up_read(sem)
-#endif
+static inline void downgrade_write(struct rw_semaphore *sem)
+{
+ rwsemtrace(sem,"Entering downgrade_write");
+ __downgrade_write(sem);
+ rwsemtrace(sem,"Leaving downgrade_write");
+}