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 <[email protected]>
Reviewed-by: Tang Chen <[email protected]>
Cc: Tang Chen <[email protected]>
Cc: Jiang Liu <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: Jianguo Wu

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);
 	}