linux-kernel - [PATCH] kthread_bind: use wait_task_inactive(TASK

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Message-ID: <20080727124259.GC178@tv-sign.ru>
Date:	Sun, 27 Jul 2008 16:42:59 +0400
From:	Oleg Nesterov <oleg@...sign.ru>
To:	akpm@...ux-foundation.org
Cc:	roland@...hat.com, mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: [PATCH] kthread_bind: use wait_task_inactive(TASK_UNINTERRUPTIBLE)

Now that wait_task_inactive(task, state) checks task->state == state,
we can simplify the code and make this debugging check more robust.

Signed-off-by: Oleg Nesterov <oleg@...sign.ru>

--- LINUS/kernel/kthread.c~	2008-07-27 16:19:27.000000000 +0400
+++ LINUS/kernel/kthread.c	2008-07-27 16:22:17.000000000 +0400
@@ -171,12 +171,11 @@ EXPORT_SYMBOL(kthread_create);
  */
 void kthread_bind(struct task_struct *k, unsigned int cpu)
 {
-	if (k->state != TASK_UNINTERRUPTIBLE) {
+	/* Must have done schedule() in kthread() before we set_task_cpu */
+	if (!wait_task_inactive(k, TASK_UNINTERRUPTIBLE)) {
 		WARN_ON(1);
 		return;
 	}
-	/* Must have done schedule() in kthread() before we set_task_cpu */
-	wait_task_inactive(k, 0);
 	set_task_cpu(k, cpu);
 	k->cpus_allowed = cpumask_of_cpu(cpu);
 	k->rt.nr_cpus_allowed = 1;

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