From: Cody P Schafer <cody@linux.vnet.ibm.com>
Date: Wed, 3 Jul 2013 22:02:11 +0000 (-0700)
Subject: memory_hotplug: use pgdat_resize_lock() in __offline_pages()
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~17^2~373
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d702909f0aa14fe678d74d7f974aa66bfb211d0b;p=pandora-kernel.git

memory_hotplug: use pgdat_resize_lock() in __offline_pages()

mmzone.h documents node_size_lock (which pgdat_resize_lock() locks) as
follows:

        * Must be held any time you expect node_start_pfn, node_present_pages
        * or node_spanned_pages stay constant.  [...]

So actually hold it when we update node_present_pages in __offline_pages().

[akpm@linux-foundation.org: fix build]
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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