1 files changed, 5 insertions, 1 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 6fa7208bcd56..b63d7d1239df 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1208,7 +1208,11 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
 
                 arch_refresh_nodedata(nid, pgdat);
         } else {
-                /* Reset the nr_zones, order and classzone_idx before reuse */
+                /*
+                 * Reset the nr_zones, order and classzone_idx before reuse.
+                 * Note that kswapd will init kswapd_classzone_idx properly
+                 * when it starts in the near future.
+                 */
                 pgdat->nr_zones = 0;
                 pgdat->kswapd_order = 0;
                 pgdat->kswapd_classzone_idx = 0;