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

[Jianguo Wu <wujianguo@huawei.com>]

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

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Wen Congyang <wency@cn.fujitsu.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: linux-mm@kvack.org
Signed-off-by: Jianguo Wu <wujianguo@huawei.com>
---
 mm/memory_hotplug.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 07b6263..91ed7cd 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);
 	}
 
-- 
1.7.6.1


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