x86, VisWS: turn into generic arch, enhance include/asm-x86/mach-default/smpboot_hooks.h

Allow the generic smpboot quirks code to be built with
ONFIG_X86_IO_APIC disabled. This way VISWS will be able
to use it as-is.
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/asm-x86/mach-default/smpboot_hooks.h

@@ -3,7 +3,9 @@
 
 static inline void smpboot_clear_io_apic_irqs(void)
 {
+#ifdef CONFIG_X86_IO_APIC
 	io_apic_irqs = 0;
+#endif
 }
 
 static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip)
@@ -35,6 +37,7 @@ static inline void smpboot_restore_warm_reset_vector(void)
 
 static inline void __init smpboot_setup_io_apic(void)
 {
+#ifdef CONFIG_X86_IO_APIC
 	/*
 	 * Here we can be sure that there is an IO-APIC in the system. Let's
 	 * go and set it up:
@@ -45,9 +48,12 @@ static inline void __init smpboot_setup_io_apic(void)
 		nr_ioapics = 0;
 		localise_nmi_watchdog();
 	}
+#endif
 }
 
 static inline void smpboot_clear_io_apic(void)
 {
+#ifdef CONFIG_X86_IO_APIC
 	nr_ioapics = 0;
+#endif
 }