From 638e13ac37a1a89473415f407cbffc1688a20fe2 Mon Sep 17 00:00:00 2001
From: Gautham R Shenoy <ego@in.ibm.com>
Date: Mon, 15 Oct 2007 17:00:14 +0200
Subject: [PATCH] sched: fix rt ptracer monopolizing CPU

yield() in wait_task_inactive(), can cause a high priority thread to be
scheduled back in, and there by loop forever while it is waiting for some
lower priority thread which is unfortunately still on the runqueue.

Use schedule_timeout_uninterruptible(1) instead.

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Credit: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
 kernel/sched.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 9ac9989..48fc74b 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1133,7 +1133,7 @@ repeat:
 	 * yield - it could be a while.
 	 */
 	if (unlikely(on_rq)) {
-		yield();
+		schedule_timeout_uninterruptible(1);
 		goto repeat;
 	}
 
-- 
2.7.4