linux-kernel - Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon

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Message-ID: <1271101474.20295.3400.camel@laptop>
Date:	Mon, 12 Apr 2010 21:44:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Rik van Riel <riel@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	sgunderson@...foot.com
Subject: Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the
 anon_vmas of a mergeable VMA

On Mon, 2010-04-12 at 21:30 +0200, Peter Zijlstra wrote:
> 
> We could here return a non-valid and already freed anon_vma.
> 
OK, so non of the users of page_lock_anon_vma() with exception of the
memory-failure.c one could really care. And all of them seem to be safe
enough wrt dealing with a dead one.

So unless people care, I'm going to not spend more time on trying to
make page_lock_anon_vma() behave.

Instead I'll try and see wth it is that migrate.c and rmap_walk_anon are
doing.

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