From 2c1931ea1d4afe7d9031f84151fcd1e0a906d5f7 Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
Date: Tue, 27 Sep 2011 08:40:24 -0400
Subject: sched: Do not compare cpu masks in scheduler

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Clark Williams <williams@redhat.com>
Link: http://lkml.kernel.org/r/20110927124423.128129033@goodmis.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index fdf5edd..7dde497 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -2392,16 +2392,12 @@ static inline void update_migrate_disable(struct task_struct *p)
 	 */
 	mask = tsk_cpus_allowed(p);
 
-	WARN_ON(!cpumask_test_cpu(smp_processor_id(), mask));
+	if (p->sched_class->set_cpus_allowed)
+		p->sched_class->set_cpus_allowed(p, mask);
+	p->nr_cpus_allowed = cpumask_weight(mask);
 
-	if (!cpumask_equal(&p->cpus_allowed, mask)) {
-		if (p->sched_class->set_cpus_allowed)
-			p->sched_class->set_cpus_allowed(p, mask);
-		p->nr_cpus_allowed = cpumask_weight(mask);
-
-		/* Let migrate_enable know to fix things back up */
-		p->migrate_disable |= MIGRATE_DISABLE_SET_AFFIN;
-	}
+	/* Let migrate_enable know to fix things back up */
+	p->migrate_disable |= MIGRATE_DISABLE_SET_AFFIN;
 }
 
 void migrate_disable(void)
-- 
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