linux-kernel - [PATCH] RT: Fix special-case exception for preempting the local CPU

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Message-ID: <20071010144824.21333.52155.stgit@novell1.haskins.net>
Date:	Wed, 10 Oct 2007 10:49:35 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	mingo@...e.hu, peterz@...radead.org, kravetz@...ibm.com,
	rostedt@...dmis.org
Cc:	ghaskins@...ell.com, linux-rt-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] RT: Fix special-case exception for preempting the local CPU

Applies to 2.6.23-rc9-rt2...  This is another RTO related fix from the thread
two days ago.

---
RT: Fix special-case exception for preempting the local CPU

Check whether the local CPU is eligible to take the task before trying to
preempt it.

Signed-off-by: Gregory Haskins <ghaskins@...ell.com>
---

 kernel/sched.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 3e75c62..b7f7a96 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -1869,7 +1869,8 @@ out_activate:
 		 * extra locking in this particular case, because
 		 * we are on the current CPU.)
 		 */
-		if (TASK_PREEMPTS_CURR(p, this_rq))
+		if (TASK_PREEMPTS_CURR(p, this_rq)
+		    && cpu_isset(this_cpu, p->cpus_allowed))
 			set_tsk_need_resched(this_rq->curr);
 		else
 			/*

-
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