From: Jianguo Wu <wujianguo@huawei.com>
Date: Fri, 22 Mar 2013 22:04:50 +0000 (-0700)
Subject: mm/hotplug: only free wait_table if it's allocated by vmalloc
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=ca4b3f302c90de5e516296e581c31c80125cd24b;p=deliverable%2Flinux.git

mm/hotplug: only free wait_table if it's allocated by vmalloc

zone->wait_table may be allocated from bootmem, it can not be freed.

Signed-off-by: Jianguo Wu <wujianguo@huawei.com>
Reviewed-by: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 9597eec8239d..ee3765760818 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1779,7 +1779,11 @@ void try_offline_node(int nid)
 	for (i = 0; i < MAX_NR_ZONES; i++) {
 		struct zone *zone = pgdat->node_zones + i;
 
-		if (zone->wait_table)
+		/*
+		 * wait_table may be allocated from boot memory,
+		 * here only free if it's allocated by vmalloc.
+		 */
+		if (is_vmalloc_addr(zone->wait_table))
 			vfree(zone->wait_table);
 	}