linux-kernel - Re: [PATCH 1/6] mm/page_alloc: fix same zone check in __pageblock_pfn_to

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Date:	Mon, 21 Mar 2016 11:37:19 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	js1304@...il.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Laura Abbott <lauraa@...eaurora.org>,
	Minchan Kim <minchan@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Vlastimil Babka <vbabka@...e.cz>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH 1/6] mm/page_alloc: fix same zone check in
 __pageblock_pfn_to_page()

On Mon, Mar 14, 2016 at 04:31:32PM +0900, js1304@...il.com wrote:
> From: Joonsoo Kim <iamjoonsoo.kim@....com>
> 
> There is a system that node's pfn are overlapped like as following.
> 
> -----pfn-------->
> N0 N1 N2 N0 N1 N2
> 
> Therefore, we need to care this overlapping when iterating pfn range.
> 
> In __pageblock_pfn_to_page(), there is a check for this but it's
> not sufficient. This check cannot distinguish the case that zone id
> is the same but node id is different. This patch fixes it.
> 

I think you may be mixing up page_zone_id with page_zonenum.

-- 
Mel Gorman
SUSE Labs