diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 7469c50..0fb3302 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -208,7 +208,7 @@
 	/*
 	 * This doesn't need a lock to do pfn_to_page().
 	 * The section can't be removed here because of the
-	 * memory_block->state_sem.
+	 * memory_block->state_mutex.
 	 */
 	zone = page_zone(pfn_to_page(pfn));
 	pgdat_resize_lock(zone->zone_pgdat, &flags);