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 <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Christoph Hellwig <hch@infradead.org>
LKML-Reference: <20100907125057.562399240@linutronix.de>

diff --git a/include/linux/semaphore.h b/include/linux/semaphore.h
index 5310d27..39fa049 100644 (file)
--- a/include/linux/semaphore.h
+++ b/include/linux/semaphore.h
@@ -29,9 +29,6 @@ struct semaphore {
 #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;
@@ -39,9 +36,6 @@ static inline void sema_init(struct semaphore *sem, int 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);
 extern int __must_check down_killable(struct semaphore *sem);

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 90b54d4..e3c7fc0 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2794,12 +2794,8 @@ sub process {
                        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);
 
                }