From: Peter Zijlstra <peterz@infradead.org>
Date: Wed, 2 Oct 2013 09:22:18 +0000 (+0200)
Subject: sched/wait: Make the signal_pending() checks consistent
X-Git-Tag: v3.13-rc1~148^2~108
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=2f2a2b60adf368bacd6acd2116c01e32caf936c4;p=kernel%2Fkernel-generic.git

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: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20131002092527.956416254@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---

diff --git a/include/linux/tty.h b/include/linux/tty.h
index 64f8646..0503729 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -686,14 +686,13 @@ do {									\
 		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
 		if (condition)						\
 			break;						\
-		if (!signal_pending(current)) {				\
-			tty_unlock(tty);					\
-			schedule();					\
-			tty_lock(tty);					\
-			continue;					\
+		if (signal_pending(current)) {				\
+			ret = -ERESTARTSYS;				\
+			break;						\
 		}							\
-		ret = -ERESTARTSYS;					\
-		break;							\
+		tty_unlock(tty);					\
+		schedule();						\
+		tty_lock(tty);						\
 	}								\
 	finish_wait(&wq, &__wait);					\
 } while (0)
diff --git a/include/linux/wait.h b/include/linux/wait.h
index a67fc16..ccf0c52 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -261,12 +261,11 @@ do {									\
 		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
 		if (condition)						\
 			break;						\
-		if (!signal_pending(current)) {				\
-			schedule();					\
-			continue;					\
+		if (signal_pending(current)) {				\
+			ret = -ERESTARTSYS;				\
+			break;						\
 		}							\
-		ret = -ERESTARTSYS;					\
-		break;							\
+		schedule();						\
 	}								\
 	finish_wait(&wq, &__wait);					\
 } while (0)
@@ -302,14 +301,13 @@ do {									\
 		prepare_to_wait(&wq, &__wait, TASK_INTERRUPTIBLE);	\
 		if (condition)						\
 			break;						\
-		if (!signal_pending(current)) {				\
-			ret = schedule_timeout(ret);			\
-			if (!ret)					\
-				break;					\
-			continue;					\
+		if (signal_pending(current)) {				\
+			ret = -ERESTARTSYS;				\
+			break;						\
 		}							\
-		ret = -ERESTARTSYS;					\
-		break;							\
+		ret = schedule_timeout(ret);				\
+		if (!ret)						\
+			break;						\
 	}								\
 	if (!ret && (condition))					\
 		ret = 1;						\
@@ -439,14 +437,13 @@ do {									\
 			finish_wait(&wq, &__wait);			\
 			break;						\
 		}							\
-		if (!signal_pending(current)) {				\
-			schedule();					\
-			continue;					\
-		}							\
-		ret = -ERESTARTSYS;					\
-		abort_exclusive_wait(&wq, &__wait, 			\
+		if (signal_pending(current)) {				\
+			ret = -ERESTARTSYS;				\
+			abort_exclusive_wait(&wq, &__wait, 		\
 				TASK_INTERRUPTIBLE, NULL);		\
-		break;							\
+			break;						\
+		}							\
+		schedule();						\
 	}								\
 } while (0)