linux-kernel - Re: [patch] mmap: feed back correct prev vma when finding vma

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Message-ID: <CAJd=RBDu5ebAAOuie5yNc8x7vkn7LPfDZZyGzRsCUFNRojWmwQ@mail.gmail.com>
Date:	Fri, 10 Aug 2012 20:00:28 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>
Subject: Re: [patch] mmap: feed back correct prev vma when finding vma

On Fri, Aug 10, 2012 at 9:26 AM, Hugh Dickins <hughd@...gle.com> wrote:
> On Thu, 9 Aug 2012, Hillf Danton wrote:
>> After walking rb tree, if vma is determined, prev vma has to be determined
>> based on vma; and rb_prev should be considered only if no vma determined.
>
> Why?  Because you think more code is better code?  I disagree.

s/more/correct/

Because feedback is incorrect if we return vma corresponding to
the root node.

Hillf
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