From 4558c652ccf025ba50f1dfb67840df3ce977b347 Mon Sep 17 00:00:00 2001
From: Andrew Morton <akpm@linux-foundation.org>
Date: Wed, 20 Feb 2013 13:14:20 +1100
Subject: [PATCH] 
 memory-hotplug-do-not-allocate-pdgat-if-it-was-not-freed-when-offline-fix-fix

fix the warning again again

Tested-by: Wu Fengguang <fengguang.wu@intel.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/memory_hotplug.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index c806abd78d0e..559e4409cf90 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1089,7 +1089,10 @@ int __ref add_memory(int nid, u64 start, u64 size)
 	if (!res)
 		goto out;
 
-	new_pgdat = (NODE_DATA(nid) == NULL);
+	{	/* Stupid hack to suppress address-never-null warning */
+		void *p = NODE_DATA(nid);
+		new_pgdat = !p;
+	}
 	new_node = !node_online(nid);
 	if (new_node) {
 		pgdat = hotadd_new_pgdat(nid, start);
-- 
2.39.5