linux-kernel - Re: [PATCH -mm 2/6] rmap: always add new vmas at the end

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Message-ID: <20100622211040.GQ5787@random.random>
Date:	Tue, 22 Jun 2010 23:10:40 +0200
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH -mm 2/6] rmap: always add new vmas at the end

On Tue, Jun 22, 2010 at 02:08:22PM -0700, Andrew Morton wrote:
> On Mon, 21 Jun 2010 16:33:49 -0400
> Rik van Riel <riel@...hat.com> wrote:
> 
> > From: Andrea Arcangeli <aarcange@...hat.com>
> > Subject: always add new vmas at the end
> > 
> > Make sure to always add new VMAs at the end of the list.  This
> > is important so rmap_walk does not miss a VMA that was created
> > during the rmap_walk.
> > 
> > The old code got this right most of the time due to luck, but
> > was buggy when anon_vma_prepare reused a mergeable anon_vma.
> > 
> > Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> > Signed-off-by: Rik van Riel <riel@...hat.com>
> > ---
> > 
> > diff --git a/mm/rmap.c b/mm/rmap.c
> > --- a/mm/rmap.c
> > +++ b/mm/rmap.c
> > @@ -149,7 +149,7 @@ int anon_vma_prepare(struct vm_area_stru
> >  			avc->anon_vma = anon_vma;
> >  			avc->vma = vma;
> >  			list_add(&avc->same_vma, &vma->anon_vma_chain);
> > -			list_add(&avc->same_anon_vma, &anon_vma->head);
> > +			list_add_tail(&avc->same_anon_vma, &anon_vma->head);
> >  			allocated = NULL;
> >  			avc = NULL;
> >  		}
> 
> Should this go into 2.6.35?

Well migrate got broken anyway in 2.6.34, so until the whole
root-anon-vma patchqueue is merged, it's not going to provide a safe
migrate anyway and it can as well wait with the rest.
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