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

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Date:	Tue, 14 Jul 2009 01:56:12 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	James Morris <jmorris@...ei.org>
Cc:	David Howells <dhowells@...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 07/13, James Morris wrote:
>
> 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 ?

Yes, this is on top of rework-fix-is_single_threaded.patch

Given that David acked these changes, I guess they will go
to -mm soon.

> Can it be merged via security-testing#next?

Please do what you think right, I don't know what will be more
convenient to you and Andrew.

Oleg.

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