diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index dff711509661c8..5f6806bd6ac345 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -663,7 +663,7 @@ typedef struct pglist_data {
 					     range, including holes */
 	int node_id;
 	wait_queue_head_t kswapd_wait;
-	struct task_struct *kswapd;
+	struct task_struct *kswapd;	/* Protected by lock_memory_hotplug() */
 	int kswapd_max_order;
 	enum zone_type classzone_idx;
 } pg_data_t;
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 0932dc27e19d53..4607cc62b1d940 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -3279,14 +3279,17 @@ int kswapd_run(int nid)
 }
 
 /*
- * Called by memory hotplug when all memory in a node is offlined.
+ * Called by memory hotplug when all memory in a node is offlined.  Caller must
+ * hold lock_memory_hotplug().
  */
 void kswapd_stop(int nid)
 {
 	struct task_struct *kswapd = NODE_DATA(nid)->kswapd;
 
-	if (kswapd)
+	if (kswapd) {
 		kthread_stop(kswapd);
+		NODE_DATA(nid)->kswapd = NULL;
+	}
 }
 
 static int __init kswapd_init(void)