From 114d4b79f7e561fd76fb98eba79e18df7cdd60f0 Mon Sep 17 00:00:00 2001
From: Cody P Schafer <cody@linux.vnet.ibm.com>
Date: Wed, 3 Jul 2013 15:02:09 -0700
Subject: [PATCH] mmzone: note that node_size_lock should be manipulated via
 pgdat_resize_lock()

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>
---
 include/linux/mmzone.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 9ec7cffcae21..e511f9429f1e 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -733,6 +733,9 @@ typedef struct pglist_data {
 	 * or node_spanned_pages stay constant.  Holding this will also
 	 * guarantee that any pfn_valid() stays that way.
 	 *
+	 * pgdat_resize_lock() and pgdat_resize_unlock() are provided to
+	 * manipulate node_size_lock without checking for CONFIG_MEMORY_HOTPLUG.
+	 *
 	 * Nests above zone->lock and zone->span_seqlock
 	 */
 	spinlock_t node_size_lock;
-- 
2.20.1