x86, smp: refactor ->wake_cpu

- remove macro wrappers

Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index a58e9f5..6b27f6d 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -589,9 +589,8 @@
 static int __init default_update_genapic(void)
 {
 #ifdef CONFIG_X86_SMP
-# if defined(CONFIG_X86_GENERICARCH) || defined(CONFIG_X86_64)
-	apic->wakeup_cpu = wakeup_secondary_cpu_via_init;
-# endif
+	if (!apic->wakeup_cpu)
+		apic->wakeup_cpu = wakeup_secondary_cpu_via_init;
 #endif
 
 	return 0;