xen: move smp setup into smp.c

Move all the smp_ops setup into smp.c, allowing a lot of things to
become static.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/xen/xen-ops.h b/arch/x86/xen/xen-ops.h
index 77354d2..81a779f 100644
--- a/arch/x86/xen/xen-ops.h
+++ b/arch/x86/xen/xen-ops.h
@@ -47,17 +47,14 @@
 void __init xen_fill_possible_map(void);
 
 void __init xen_setup_vcpu_info_placement(void);
-void xen_smp_prepare_boot_cpu(void);
-void xen_smp_prepare_cpus(unsigned int max_cpus);
-int xen_cpu_up(unsigned int cpu);
-void xen_smp_cpus_done(unsigned int max_cpus);
 
-void xen_smp_send_stop(void);
-void xen_smp_send_reschedule(int cpu);
-void xen_smp_send_call_function_ipi(cpumask_t mask);
-void xen_smp_send_call_function_single_ipi(int cpu);
+#ifdef CONFIG_SMP
+void xen_smp_init(void);
 
 extern cpumask_t xen_cpu_initialized_map;
+#else
+static inline void xen_smp_init(void) {}
+#endif
 
 
 /* Declare an asm function, along with symbols needed to make it