[PATCH] fix remaining missing includes

Fix more include file problems that surfaced since I submitted the previous
fix-missing-includes.patch.  This should now allow not to include sched.h
from module.h, which is done by a followup patch.

Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/memory.h b/include/linux/memory.h
index 0def328..9a42438 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -54,6 +54,9 @@
  */
 #define	MEM_MAPPING_INVALID	(1<<3)
 
+struct notifier_block;
+struct mem_section;
+
 #ifndef CONFIG_MEMORY_HOTPLUG
 static inline int memory_dev_init(void)
 {