linux-kernel - Re: [RFC v2] memory-hotplug: remove MIGRATE_ISOLATE from free_area->free

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Date:	Thu, 06 Sep 2012 14:56:45 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>,
	Minchan Kim <minchan@...nel.org>
Cc:	Kamezawa Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>,
	Wen Congyang <wency@...fujitsu.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: Re: [RFC v2] memory-hotplug: remove MIGRATE_ISOLATE from free_area->free_list

>> +		pfn = page_to_pfn(page);
>> +		if (pfn >= end_pfn)
>> +			return false;
>> +		if (pfn >= start_pfn)
>> +			goto found;

On Thu, Sep 06 2012, Lai Jiangshan wrote:
> this test is wrong.
>
> use this:
>
> if ((pfn <= start_pfn) && (start_pfn < pfn + (1UL << page_order(page))))
> 	goto found;
>
> if (pfn > start_pfn)
> 	return false;

	if (pfn > start_pfn)
		return false;
	if (pfn + (1UL << page_order(page)) > start_pfn)
		goto found;

>> +	}
>> +	return false;
>> +
>> +	list_for_each_entry_continue(page, &isolated_pages, lru) {
>> +		if (page_to_pfn(page) != next_pfn)
>> +			return false;

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@...gle.com>--------------ooO--(_)--Ooo--

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