sched: clean up sleep_on() APIs

clean up the sleep_on() APIs:

 - do not use fastcall
 - replace fragile macro magic with proper inline functions
Signed-off-by: NIngo Molnar <mingo@elte.hu>

include/linux/wait.h

@@ -367,14 +367,14 @@ static inline void remove_wait_queue_locked(wait_queue_head_t *q,
 /*
  * These are the old interfaces to sleep waiting for an event.
  * They are racy.  DO NOT use them, use the wait_event* interfaces above.
- * We plan to remove these interfaces during 2.7.
+ * We plan to remove these interfaces.
  */
-extern void FASTCALL(sleep_on(wait_queue_head_t *q));
-extern long FASTCALL(sleep_on_timeout(wait_queue_head_t *q,
-				      signed long timeout));
-extern void FASTCALL(interruptible_sleep_on(wait_queue_head_t *q));
-extern long FASTCALL(interruptible_sleep_on_timeout(wait_queue_head_t *q,
-						    signed long timeout));
+extern void sleep_on(wait_queue_head_t *q);
+extern long sleep_on_timeout(wait_queue_head_t *q,
+				      signed long timeout);
+extern void interruptible_sleep_on(wait_queue_head_t *q);
+extern long interruptible_sleep_on_timeout(wait_queue_head_t *q,
+					   signed long timeout);
 
 /*
  * Waitqueues which are removed from the waitqueue_head at wakeup time

kernel/sched.c

@@ -3699,74 +3699,85 @@ wait_for_completion_interruptible_timeout(struct completion *x,
 }
 EXPORT_SYMBOL(wait_for_completion_interruptible_timeout);
 
-
-#define	SLEEP_ON_VAR					\
-	unsigned long flags;				\
-	wait_queue_t wait;				\
-	init_waitqueue_entry(&wait, current);
-
-#define SLEEP_ON_HEAD					\
-	spin_lock_irqsave(&q->lock,flags);		\
-	__add_wait_queue(q, &wait);			\
+static inline void
+sleep_on_head(wait_queue_head_t *q, wait_queue_t *wait, unsigned long *flags)
+{
+	spin_lock_irqsave(&q->lock, *flags);
+	__add_wait_queue(q, wait);
 	spin_unlock(&q->lock);
+}
 
-#define	SLEEP_ON_TAIL					\
-	spin_lock_irq(&q->lock);			\
-	__remove_wait_queue(q, &wait);			\
-	spin_unlock_irqrestore(&q->lock, flags);
+static inline void
+sleep_on_tail(wait_queue_head_t *q, wait_queue_t *wait, unsigned long *flags)
+{
+	spin_lock_irq(&q->lock);
+	__remove_wait_queue(q, wait);
+	spin_unlock_irqrestore(&q->lock, *flags);
+}
 
-void fastcall __sched interruptible_sleep_on(wait_queue_head_t *q)
+void __sched interruptible_sleep_on(wait_queue_head_t *q)
 {
-	SLEEP_ON_VAR
+	unsigned long flags;
+	wait_queue_t wait;
+
+	init_waitqueue_entry(&wait, current);
 
 	current->state = TASK_INTERRUPTIBLE;
 
-	SLEEP_ON_HEAD
+	sleep_on_head(q, &wait, &flags);
 	schedule();
-	SLEEP_ON_TAIL
+	sleep_on_tail(q, &wait, &flags);
 }
 EXPORT_SYMBOL(interruptible_sleep_on);
 
-long fastcall __sched
+long __sched
 interruptible_sleep_on_timeout(wait_queue_head_t *q, long timeout)
 {
-	SLEEP_ON_VAR
+	unsigned long flags;
+	wait_queue_t wait;
+
+	init_waitqueue_entry(&wait, current);
 
 	current->state = TASK_INTERRUPTIBLE;
 
-	SLEEP_ON_HEAD
+	sleep_on_head(q, &wait, &flags);
 	timeout = schedule_timeout(timeout);
-	SLEEP_ON_TAIL
+	sleep_on_tail(q, &wait, &flags);
 
 	return timeout;
 }
 EXPORT_SYMBOL(interruptible_sleep_on_timeout);
 
-void fastcall __sched sleep_on(wait_queue_head_t *q)
+void __sched sleep_on(wait_queue_head_t *q)
 {
-	SLEEP_ON_VAR
+	unsigned long flags;
+	wait_queue_t wait;
+
+	init_waitqueue_entry(&wait, current);
 
 	current->state = TASK_UNINTERRUPTIBLE;
 
-	SLEEP_ON_HEAD
+	sleep_on_head(q, &wait, &flags);
 	schedule();
-	SLEEP_ON_TAIL
+	sleep_on_tail(q, &wait, &flags);
 }
 EXPORT_SYMBOL(sleep_on);
 
-long fastcall __sched sleep_on_timeout(wait_queue_head_t *q, long timeout)
+long __sched sleep_on_timeout(wait_queue_head_t *q, long timeout)
 {
-	SLEEP_ON_VAR
+	unsigned long flags;
+	wait_queue_t wait;
+
+	init_waitqueue_entry(&wait, current);
 
 	current->state = TASK_UNINTERRUPTIBLE;
 
-	SLEEP_ON_HEAD
+	sleep_on_head(q, &wait, &flags);
 	timeout = schedule_timeout(timeout);
-	SLEEP_ON_TAIL
+	sleep_on_tail(q, &wait, &flags);
 
 	return timeout;
 }
-
 EXPORT_SYMBOL(sleep_on_timeout);
 
 #ifdef CONFIG_RT_MUTEXES