From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Date: Thu, 6 Nov 2008 20:53:36 +0000 (-0800)
Subject: memory hotplug: fix page_zone() calculation in test_pages_isolated()
X-Git-Tag: v2.6.27.7~27
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3fd7e3ce7ec2dcf13a2fa592ee48dd528ba9c561;p=pandora-kernel.git

memory hotplug: fix page_zone() calculation in test_pages_isolated()

commit a70dcb969f64e2fa98c24f47854f20bf02ff0092 upstream.

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@de.ibm.com>
Acked-by: Nathan Fontenot <nfont@austin.ibm.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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