Date: Mon, 21 Mar 2016 11:37:19 +0000
From: Mel Gorman <mgorman@suse.de>
To: js1304@gmail.com
Cc: Andrew Morton <akpm@linux-foundation.org>, Rik van Riel <riel@redhat.com>,
        Johannes Weiner <hannes@cmpxchg.org>,
        Laura Abbott <lauraa@codeaurora.org>, Minchan Kim <minchan@kernel.org>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Michal Nazarewicz <mina86@mina86.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
        Vlastimil Babka <vbabka@suse.cz>, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [PATCH 1/6] mm/page_alloc: fix same zone check in
 __pageblock_pfn_to_page()
Message-ID: <20160321113719.GM28876@suse.de>
References: <1457940697-2278-1-git-send-email-iamjoonsoo.kim@lge.com>
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On Mon, Mar 14, 2016 at 04:31:32PM +0900, js1304@gmail.com wrote:
> From: Joonsoo Kim <iamjoonsoo.kim@lge.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