linux-kernel - Re: [PATCH] memory hotplug: fix page_zone() calculation in test_pages

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Date:	Wed, 29 Oct 2008 13:00:44 -0500
From:	Nathan Fontenot <nfont@...tin.ibm.com>
To:	gerald.schaefer@...ibm.com
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, schwidefsky@...ibm.com,
	heiko.carstens@...ibm.com, kamezawa.hiroyu@...fujitsu.com,
	y-goto@...fujitsu.com, dave@...ux.vnet.ibm.com
Subject: Re: [PATCH] memory hotplug: fix page_zone() calculation in	test_pages_isolated()

Looks like you beat me to it, and with a nicer fix too.

Gerald Schaefer wrote:
> From: Gerald Schaefer <gerald.schaefer@...ibm.com>
> 
> My last bugfix here (adding zone->lock) introduced a new problem: Using
> page_zone(pfn_to_page(pfn)) to get the zone after the for() loop is wrong.
> pfn will then be >= end_pfn, which may be in a different zone or not
> present at all. This may lead to an addressing exception in page_zone()
> or spin_lock_irqsave().
> 
> Now I use __first_valid_page() again after the loop to find a valid page
> for page_zone().
> 
> Signed-off-by: Gerald Schaefer <gerald.schaefer@...ibm.com>

Acked-by: Nathan Fontenot <nfont@...tin.ibm.com>
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