[PATCH] register_one_node() compile fix

register_one_node()'s should be defined under CONFIG_NUMA=n.
fixes following bug.

  CC	  init/version.o
  LD	  init/built-in.o
  LD	  .tmp_vmlinux1
  mm/built-in.o: In function `add_memory': undefined reference to `register_one_node'

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

include/linux/node.h

@@ -30,12 +30,20 @@ extern struct node node_devices[];
 
 extern int register_node(struct node *, int, struct node *);
 extern void unregister_node(struct node *node);
+#ifdef CONFIG_NUMA
 extern int register_one_node(int nid);
 extern void unregister_one_node(int nid);
-#ifdef CONFIG_NUMA
 extern int register_cpu_under_node(unsigned int cpu, unsigned int nid);
 extern int unregister_cpu_under_node(unsigned int cpu, unsigned int nid);
 #else
+static inline int register_one_node(int nid)
+{
+	return 0;
+}
+static inline int unregister_one_node(int nid)
+{
+	return 0;
+}
 static inline int register_cpu_under_node(unsigned int cpu, unsigned int nid)
 {
 	return 0;