linux-kernel - Re: [PATCH 0/2] Fix migration races in rmap

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Message-ID: <20100501135110.GP20640@cmpxchg.org>
Date:	Sat, 1 May 2010 15:51:10 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrea Arcangeli <aarcange@...hat.com>
Cc:	Mel Gorman <mel@....ul.ie>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 0/2] Fix migration races in rmap_walk() V3

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@...hat.com>
> 
> wait_split_huge_page interface changed.
> 
> Signed-off-by: Andrea Arcangeli <aarcange@...hat.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.
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