linux-kernel - Re: [PATCH 2/4] mm, rmap: allocate anon_vma_chain before starting to link anon_vma

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Date:	Wed, 7 Aug 2013 16:17:26 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Minchan Kim <minchan@...nel.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: [PATCH 2/4] mm, rmap: allocate anon_vma_chain before starting to
 link anon_vma_chain

On Wed, Aug 07, 2013 at 02:08:03AM -0400, Johannes Weiner wrote:
> >  
> >  	list_for_each_entry_reverse(pavc, &src->anon_vma_chain, same_vma) {
> >  		struct anon_vma *anon_vma;
> >  
> > -		avc = anon_vma_chain_alloc(GFP_NOWAIT | __GFP_NOWARN);
> > -		if (unlikely(!avc)) {
> > -			unlock_anon_vma_root(root);
> > -			root = NULL;
> > -			avc = anon_vma_chain_alloc(GFP_KERNEL);
> > -			if (!avc)
> > -				goto enomem_failure;
> > -		}
> > +		avc = list_entry((&avc_list)->next, typeof(*avc), same_vma);
> 
> list_first_entry() please

Okay. I will send next version soon.

> 
> > +		list_del(&avc->same_vma);
> >  		anon_vma = pavc->anon_vma;
> >  		root = lock_anon_vma_root(root, anon_vma);
> >  		anon_vma_chain_link(dst, avc, anon_vma);
> > @@ -259,8 +262,11 @@ int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src)
> >  	unlock_anon_vma_root(root);
> >  	return 0;
> >  
> > - enomem_failure:
> > -	unlink_anon_vmas(dst);
> > +enomem_failure:
> > +	list_for_each_entry_safe(avc, pavc, &avc_list, same_vma) {
> > +		list_del(&avc->same_vma);
> > +		anon_vma_chain_free(avc);
> > +	}
> >  	return -ENOMEM;
> >  }
> 
> Otherwise, looks good.

Thank you!

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