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 9597eec..ee37657 100644 (file)
--- 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);
        }