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Date:	Sun, 20 Oct 2013 18:05:21 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	JoonSoo Kim <js1304@...il.com>
cc:	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 13/15] slab: use struct page for slab management

On Sat, 19 Oct 2013, JoonSoo Kim wrote:

> I search the history of struct page and find that the SLUB use mapping field
> in past (2007 year). At that time, you inserted VM_BUG_ON(PageSlab(page))
> ('b5fab14') into page_mapping() function to find remaining use. Recently,
> I never hear that this is triggered and 6 years have passed since inserting
> VM_BUG_ON(), so I guess there is no problem to use it.
> If this argument is reasonable, please give me an ACK :)
>
> Thanks.

Acked-by: Christoph Lameter <cl@...ux.com>

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