semaphore: Remove mutex emulation

Semaphores used as mutexes have been deprecated for years. Now that
all users are either converted to real semaphores or to mutexes remove
the cruft.

Signed-off-by: Thomas Gleixner <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Christoph Hellwig <[e-mail]>
LKML-Reference: <[e-mail]>

include/linux/semaphore.h

···
 #define DEFINE_SEMAPHORE(name)	\
 	struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
 
-#define DECLARE_MUTEX(name)	\
-	struct semaphore name = __SEMAPHORE_INITIALIZER(name, 1)
-
 static inline void sema_init(struct semaphore *sem, int val)
 {
 	static struct lock_class_key __key;
 	*sem = (struct semaphore) __SEMAPHORE_INITIALIZER(*sem, val);
 	lockdep_init_map(&sem->lock.dep_map, "semaphore->lock", &__key, 0);
 }
-
-#define init_MUTEX(sem)		sema_init(sem, 1)
-#define init_MUTEX_LOCKED(sem)	sema_init(sem, 0)
 
 extern void down(struct semaphore *sem);
 extern int __must_check down_interruptible(struct semaphore *sem);

scripts/checkpatch.pl

···
 			WARN("__func__ should be used instead of gcc specific __FUNCTION__\n"  . $herecurr);
 		}
 
-# check for semaphores used as mutexes
-		if ($line =~ /^.\s*(DECLARE_MUTEX|init_MUTEX)\s*\(/) {
-			WARN("mutexes are preferred for single holder semaphores\n" . $herecurr);
-		}
-# check for semaphores used as mutexes
-		if ($line =~ /^.\s*init_MUTEX_LOCKED\s*\(/) {
+# check for semaphores initialized locked
+		if ($line =~ /^.\s*sema_init.+,\W?0\W?\)/) {
 			WARN("consider using a completion\n" . $herecurr);
 
 		}