[PATCH] update vm_total_pages at memory hotadd

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/memory_hotplug.c

@@ -160,6 +160,6 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
 
 	if (need_zonelists_rebuild)
 		build_all_zonelists();
-
+	vm_total_pages = nr_free_pagecache_pages();
 	return 0;
 }