[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>

include/linux/irq.h

@@ -10,6 +10,7 @@
  */
 
 #include <linux/config.h>
+#include <asm/smp.h>		/* cpu_online_map */
 
 #if !defined(CONFIG_ARCH_S390)
 

include/linux/memory.h

@@ -54,6 +54,9 @@ struct memory_block {
  */
 #define	MEM_MAPPING_INVALID	(1<<3)
 
+struct notifier_block;
+struct mem_section;
+
 #ifndef CONFIG_MEMORY_HOTPLUG
 static inline int memory_dev_init(void)
 {

include/linux/sem.h

@@ -79,6 +79,8 @@ struct  seminfo {
 
 #ifdef __KERNEL__
 
+struct task_struct;
+
 /* One semaphore structure for each semaphore in the system. */
 struct sem {
 	int	semval;		/* current value */

include/linux/wait.h

@@ -54,6 +54,7 @@ struct __wait_queue_head {
 };
 typedef struct __wait_queue_head wait_queue_head_t;
 
+struct task_struct;
 
 /*
  * Macros for declaration and initialisaton of the datatypes