x86: provide connect_bsp_APIC for x86_64

Although it is not really needed, we provide it to get
closer to i386. ifdefs around it are removed in smpboot.c
Signed-off-by: NGlauber Costa <gcosta@redhat.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

arch/x86/kernel/apic_64.c

@@ -918,6 +918,8 @@ int __init APIC_init_uniprocessor(void)
 
 	verify_local_APIC();
 
+	connect_bsp_APIC();
+
 	physid_set_mask_of_physid(boot_cpu_physical_apicid, &phys_cpu_present_map);
 	apic_write(APIC_ID, SET_APIC_ID(boot_cpu_physical_apicid));
 
@@ -999,6 +1001,14 @@ asmlinkage void smp_error_interrupt(void)
 	irq_exit();
 }
 
+/**
+ *  * connect_bsp_APIC - attach the APIC to the interrupt system
+ *   */
+void __init connect_bsp_APIC(void)
+{
+	enable_apic_mode();
+}
+
 void disconnect_bsp_APIC(int virt_wire_setup)
 {
 	/* Go back to Virtual Wire compatibility mode */

arch/x86/kernel/smpboot.c

@@ -1116,9 +1116,7 @@ static int __init smp_sanity_check(unsigned max_cpus)
 
 		localise_nmi_watchdog();
 
-#ifdef CONFIG_X86_32
 		connect_bsp_APIC();
-#endif
 		setup_local_APIC();
 		end_local_APIC_setup();
 		return -1;
@@ -1173,9 +1171,8 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
 	}
 	preempt_enable();
 
-#ifdef CONFIG_X86_32
 	connect_bsp_APIC();
-#endif
+
 	/*
 	 * Switch from PIC to APIC mode.
 	 */