[PATCH] Fix compilation with CONFIG_MEMORY_HOTPLUG=y and gcc41.

Fix compilation with CONFIG_MEMORY_HOTPLUG=y and gcc41.
Also remove unneeded declations, add a public function.

drivers/base/memory.c:53: error: static declaration of 'register_memory_notifier' follows non-static declaration
include/linux/memory.h:85: error: previous declaration of 'register_memory_notifier' was here
drivers/base/memory.c:58: error: static declaration of 'unregister_memory_notifier' follows non-static declaration
include/linux/memory.h:86: error: previous declaration of 'unregister_memory_notifier' was here
drivers/base/memory.c:68: error: static declaration of 'register_memory' follows non-static declaration
include/linux/memory.h:73: error: previous declaration of 'register_memory' was here

Signed-off-by: Olaf Hering <olh@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/memory.h

@@ -70,21 +70,15 @@ static inline void unregister_memory_notifier(struct notifier_block *nb)
 {
 }
 #else
-extern int register_memory(struct memory_block *, struct mem_section *section, struct node *);
 extern int register_new_memory(struct mem_section *);
 extern int unregister_memory_section(struct mem_section *);
 extern int memory_dev_init(void);
-extern int register_memory_notifier(struct notifier_block *nb);
-extern void unregister_memory_notifier(struct notifier_block *nb);
+extern int remove_memory_block(unsigned long, struct mem_section *, int);
 
 #define CONFIG_MEM_BLOCK_SIZE	(PAGES_PER_SECTION<<PAGE_SHIFT)
 
-extern int invalidate_phys_mapping(unsigned long, unsigned long);
 struct notifier_block;
 
-extern int register_memory_notifier(struct notifier_block *nb);
-extern void unregister_memory_notifier(struct notifier_block *nb);
-
 #endif /* CONFIG_MEMORY_HOTPLUG */
 
 #define hotplug_memory_notifier(fn, pri) {			\