linux-kernel - Re: [PATCH 13/16] cgroup_freezer: prepare for removal of TIF

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Message-ID: <20110829063026.GA16431@mtj.dyndns.org>
Date:	Mon, 29 Aug 2011 08:30:26 +0200
From:	Tejun Heo <tj@...nel.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	rjw@...k.pl, paul@...lmenage.org, linux-kernel@...r.kernel.org,
	arnd@...db.de, Li Zefan <lizf@...fujitsu.com>
Subject: Re: [PATCH 13/16] cgroup_freezer: prepare for removal of TIF_FREEZE

Hello,

On Sun, Aug 28, 2011 at 07:39:54PM +0200, Oleg Nesterov wrote:
> > @@ -321,6 +307,8 @@ static int freezer_change_state(struct cgroup *cgroup,
> >  	if (goal_state == freezer->state)
> >  		goto out;
> >
> > +	freezer->state = goal_state;
> > +
> 
> This doesn't look right at all... Unless I misssed something.
> 
> A user writes "FROZEN" into the control file, our goal is CGROUP_FROZEN.
> 
> But. freezer_change_state() should set CGROUP_FREEZING, not CGROUP_FROZEN.
> This cgrp is not frozen yet, _FROZEN should be set by update_if_frozen(),
> assuming that the user reads the state waiting until the operation
> completes.

Oops, right.  That should have been CGROUP_FREEZING.  Will fix.

Thanks.

-- 
tejun
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