sched/wait: Make the signal_pending() checks consistent

There's two patterns to check signals in the __wait_event*() macros:

  if (!signal_pending(current)) {
	schedule();
	continue;
  }
  ret = -ERESTARTSYS;
  break;

And the more natural:

  if (signal_pending(current)) {
	ret = -ERESTARTSYS;
	break;
  }
  schedule();

Change them all into the latter form.
Reviewed-by: NOleg Nesterov <oleg@redhat.com>
Signed-off-by: NPeter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20131002092527.956416254@infradead.orgSigned-off-by: NIngo Molnar <mingo@kernel.org>

include/linux/tty.h

@@ -686,14 +686,13 @@ do {									\
 		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
 		if (condition)						\
 			break;						\
-		if (!signal_pending(current)) {				\
+		if (signal_pending(current)) {				\
+			ret = -ERESTARTSYS;				\
+			break;						\
+		}							\
 		tty_unlock(tty);					\
 		schedule();						\
 		tty_lock(tty);						\
-			continue;					\
-		}							\
-		ret = -ERESTARTSYS;					\
-		break;							\
 	}								\
 	finish_wait(&wq, &__wait);					\
 } while (0)

include/linux/wait.h

@@ -261,13 +261,12 @@ do {									\
 		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
 		if (condition)						\
 			break;						\
-		if (!signal_pending(current)) {				\
-			schedule();					\
-			continue;					\
-		}							\
+		if (signal_pending(current)) {				\
 			ret = -ERESTARTSYS;				\
 			break;						\
 		}							\
+		schedule();						\
+	}								\
 	finish_wait(&wq, &__wait);					\
 } while (0)
 
@@ -302,13 +301,12 @@ do {									\
 		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
 		if (condition)						\
 			break;						\
-		if (!signal_pending(current)) {				\
-			ret = schedule_timeout(ret);			\
-			if (!ret)					\
+		if (signal_pending(current)) {				\
+			ret = -ERESTARTSYS;				\
 			break;						\
-			continue;					\
 		}							\
-		ret = -ERESTARTSYS;					\
+		ret = schedule_timeout(ret);				\
+		if (!ret)						\
 			break;						\
 	}								\
 	if (!ret && (condition))					\
@@ -439,15 +437,14 @@ do {									\
 			finish_wait(&wq, &__wait);			\
 			break;						\
 		}							\
-		if (!signal_pending(current)) {				\
-			schedule();					\
-			continue;					\
-		}							\
+		if (signal_pending(current)) {				\
 			ret = -ERESTARTSYS;				\
 			abort_exclusive_wait(&wq, &__wait, 		\
 				TASK_INTERRUPTIBLE, NULL);		\
 			break;						\
 		}							\
+		schedule();						\
+	}								\
 } while (0)
 
 #define wait_event_interruptible_exclusive(wq, condition)		\