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Date: Sat, 1 May 2010 15:51:10 +0200
From: Johannes Weiner <hannes@cmpxchg.org>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>, Andrew Morton <akpm@linux-foundation.org>,
       Linux-MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>,
       Minchan Kim <minchan.kim@gmail.com>,
       KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
       Christoph Lameter <cl@linux.com>, Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 0/2] Fix migration races in rmap_walk() V3
Message-ID: <20100501135110.GP20640@cmpxchg.org>
References: <1272529930-29505-1-git-send-email-mel@csn.ul.ie> <20100430182853.GK22108@random.random>
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On Fri, Apr 30, 2010 at 08:28:53PM +0200, Andrea Arcangeli wrote:
> Subject: adapt mprotect to anon_vma chain semantics
> 
> From: Andrea Arcangeli <aarcange@redhat.com>
> 
> wait_split_huge_page interface changed.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
> ---
> 
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -929,7 +929,7 @@ int change_huge_pmd(struct vm_area_struc
>  	if (likely(pmd_trans_huge(*pmd))) {
>  		if (unlikely(pmd_trans_splitting(*pmd))) {
>  			spin_unlock(&mm->page_table_lock);
> -			wait_split_huge_page(vma->anon_vma, pmd);
> +			wait_split_huge_page(mm, pmd);

That makes mprotect-vma-arg obsolete, I guess.