diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 48aee0f5902f148f7b6a480f03b6e816ac057b91..a6f7576aecae4c1e0b75fd2d673ae0a44a5190b0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4515,6 +4515,9 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
 {
 	pg_data_t *pgdat = NODE_DATA(nid);
 
+	/* pg_data_t should be reset to zero when it's allocated */
+	WARN_ON(pgdat->nr_zones || pgdat->node_start_pfn || pgdat->classzone_idx);
+
 	pgdat->node_id = nid;
 	pgdat->node_start_pfn = node_start_pfn;
 	calculate_node_totalpages(pgdat, zones_size, zholes_size);