linux-kernel - Re: [PATCH 1/2] mm: page_isolation: check pfn validity before access

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Date:	Tue, 11 Nov 2014 14:23:44 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Weijie Yang <weijie.yang@...sung.com>
Cc:	kamezawa.hiroyu@...fujitsu.com,
	"'Minchan Kim'" <minchan@...nel.org>, mgorman@...e.de,
	mina86@...a86.com, "'linux-kernel'" <linux-kernel@...r.kernel.org>,
	"'Linux-MM'" <linux-mm@...ck.org>,
	"'Weijie Yang'" <weijie.yang.kh@...il.com>
Subject: Re: [PATCH 1/2] mm: page_isolation: check pfn validity before
 access

On Thu, 06 Nov 2014 16:08:02 +0800 Weijie Yang <weijie.yang@...sung.com> wrote:

> In the undo path of start_isolate_page_range(), we need to check
> the pfn validity before access its page, or it will trigger an
> addressing exception if there is hole in the zone.
> 

There is not enough information in the chagnelog for me to decide how
to handle the patch.  3.19?  3.18? 3.18+stable?

When fixing bugs, please remember to fully explain the end-user impact
of the bug.  Under what circumstances does it occur?


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