Index: linux-3.5-rc6/mm/memory_hotplug.c
===================================================================
--- linux-3.5-rc6.orig/mm/memory_hotplug.c	2012-07-18 18:25:11.036597977 +0900
+++ linux-3.5-rc6/mm/memory_hotplug.c	2012-07-18 18:25:54.860050109 +0900
@@ -1048,6 +1048,11 @@ int __ref remove_memory(int nid, u64 sta
 	/* remove memmap entry */
 	firmware_map_remove(start, start + size, "System RAM");
 
+	if (!node_present_pages(nid)) {
+		node_set_offline(nid);
+		unregister_one_node(nid);
+	}
+
 	__remove_pages(start >> PAGE_SHIFT, size >> PAGE_SHIFT);
 out:
 	unlock_memory_hotplug();