linux-kernel - Re: Containers: css

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Date:	Tue, 17 Jul 2007 00:18:33 -0700
From:	"Paul (宝瑠) Menage" 
	<menage@...gle.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"Pavel Emelianov" <xemul@...ru>,
	"linux kernel mailing list" <linux-kernel@...r.kernel.org>,
	"Paul Jackson" <pj@....com>,
	"Linux Containers" <containers@...ts.osdl.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	dhaval@...ux.vnet.ibm.com
Subject: Re: Containers: css_put() dilemma

On 7/17/07, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> >
> > >                mutex_lock(&container_mutex);
> > >                set_bit(CONT_RELEASABLE, &cont->flags);
> > >-               if (atomic_dec_and_test(&css->refcnt)) {
> > >-                       check_for_release(cont);
> > >-               }
> > >+               check_for_release(cont);
> > >                mutex_unlock(&container_mutex);
> > >

I think that this isn't safe as it stands, without a synchronize_rcu()
in container_diput() prior to the kfree(). Also, it will break if
anyone tries to use a release agent on a hierarchy that has your
memory controller bound to it.

Paul
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