linux-kernel - [PATCH 13/12] sched: remove debug check

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Date:	Wed, 16 Dec 2009 22:17:18 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Mike Galbraith <efault@....de>, linux-kernel@...r.kernel.org
Subject: [PATCH 13/12] sched: remove debug check

Since you're running into this warning and not seeing any obvious ill
side-effects (you'd see some serious starvation issues), please stick
this patch in for now.

I can't seem to convince myself if its a real problem or not, and how it
could possibly happen, but my brain is giving up for today.

---
Index: linux-2.6/kernel/sched.c
===================================================================
--- linux-2.6.orig/kernel/sched.c
+++ linux-2.6/kernel/sched.c
@@ -2036,14 +2036,6 @@ task_hot(struct task_struct *p, u64 now,
 
 void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
 {
-#ifdef CONFIG_SCHED_DEBUG
-	/*
-	 * We should never call set_task_cpu() on a blocked task,
-	 * ttwu() will sort out the placement.
-	 */
-	WARN_ON(p->state != TASK_RUNNING && p->state != TASK_WAKING);
-#endif
-
 	trace_sched_migrate_task(p, new_cpu);
 
 	if (task_cpu(p) == new_cpu)


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