linux-kernel - Re: [PATCH 09/16] freezer: make freezing indicate freeze condition in effect

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Date:	Mon, 29 Aug 2011 09:31:31 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	rjw@...k.pl, menage@...gle.com, linux-kernel@...r.kernel.org,
	arnd@...db.de
Subject: Re: [PATCH 09/16] freezer: make freezing indicate freeze condition
 in effect

On Sun, Aug 28, 2011 at 07:56:01PM +0200, Oleg Nesterov wrote:
> > +	/* leave FROZEN */
> > +	spin_lock_irq(&freezer_lock);
> > +	current->flags &= ~PF_FROZEN;
> > +	spin_unlock_irq(&freezer_lock);
> 
> What if freezing() is true again when we are going to clear
> PF_FROZEN?
> 
> In this case the 2nd try_to_freeze_tasks() can see this task
> as already frozen and return success while it is going to run.

Indeed, if we need to do if (frezing) goto retry; there.  Will fix.

Thanks.

-- 
tejun
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