linux-kernel - Re: [PATCH -mm 3/7] Freezer: Remove PF

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Message-ID: <20070302233337.GA267@tv-sign.ru>
Date:	Sat, 3 Mar 2007 02:33:37 +0300
From:	Oleg Nesterov <oleg@...sign.ru>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Anton Blanchard <anton@...ba.org>,
	Andrew Morton <akpm@...l.org>, Pavel Machek <pavel@....cz>,
	LKML <linux-kernel@...r.kernel.org>,
	Aneesh Kumar <aneesh.kumar@...il.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Gautham R Shenoy <ego@...ibm.com>
Subject: Re: [PATCH -mm 3/7] Freezer: Remove PF_NOFREEZE from rcutorture thread

On 03/02, Paul E. McKenney wrote:
>
> One way to embed try_to_freeze() into kthread_should_stop() might be
> as follows:
> 
> 	int kthread_should_stop(void)
> 	{
> 		if (kthread_stop_info.k == current)
> 			return 1;
> 		try_to_freeze();
> 		return 0;
> 	}

I think this is dangerous. For example, worker_thread() will probably
need some special actions after return from refrigerator. Also, a kernel
thread may check kthread_should_stop() in the place where try_to_freeze()
is not safe.

Perhaps we should introduce a new helper which does this.

Oleg.

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