linux-kernel - Re: [PATCH v2 -mm 2/2] current_is_single_threaded: don't use ->mmap

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Date:	Mon, 13 Jul 2009 08:12:13 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	David Howells <dhowells@...hat.com>
cc:	Oleg Nesterov <oleg@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 -mm 2/2] current_is_single_threaded: don't use
 ->mmap_sem

On Fri, 10 Jul 2009, David Howells wrote:

> > However we can avoid ->mmap_sem and rely on rcu/barriers:
> > 
> > 	- if we do not see the exiting parent on thread/process list
> > 	  we see the result of list_del_rcu(), in this case we must
> > 	  also see the result of list_add_rcu() which does wmb().
> > 
> > 	- if we do see the parent but its ->mm == NULL, we need rmb()
> > 	  to make sure we can't miss the child.
> > 
> > Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> 
> Acked-by: David Howells <dhowells@...hat.com>

I gather this stuff is going into -mm ?

Can it be merged via security-testing#next?

-- 
James Morris
<jmorris@...ei.org>
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