extern unsigned nfs4_callback_getattr(struct cb_getattrargs *args, struct cb_getattrres *res);
extern unsigned nfs4_callback_recall(struct cb_recallargs *args, void *dummy);
+#ifdef CONFIG_NFS_V4
extern int nfs_callback_up(void);
-extern int nfs_callback_down(void);
+extern void nfs_callback_down(void);
+#else
+#define nfs_callback_up() (0)
+#define nfs_callback_down() do {} while(0)
+#endif
extern unsigned int nfs_callback_set_tcpport;
extern unsigned short nfs_callback_tcpport;