diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 2427706f78b4d7043b5476b310d5a203631dbf90..68c569fcbb66ff751d689c57e19f196d33b2b0f8 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -694,7 +694,7 @@ 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 eeb3bc9d1d361b6f20821073485f1b8e7c4931d3..661576324c7f52ead9d5eaf6b3619498c1047336 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2955,14 +2955,17 @@ 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)