[PATCH] memory-hotplug compile fix

include/linux/memory_hotplug.h:53: warning: 'struct page' declared inside parameter list

(akpm: I tossed in a couple more possibly-needed-sometime struct decls too)

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>