x86: factor out irq initialization for x86_64

Provide apic_intr_init and smp_intr_init functions.
Signed-off-by: Glauber Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

arch/x86/kernel/irqinit_64.c

@@ -164,22 +164,8 @@ static void __init init_ISA_irqs (void)
 
 void init_IRQ(void) __attribute__((weak, alias("native_init_IRQ")));
 
-void __init native_init_IRQ(void)
+void __init smp_intr_init(void)
 {
-	int i;
-
-	init_ISA_irqs();
-	/*
-	 * Cover the whole vector space, no vector can escape
-	 * us. (some of these will be overridden and become
-	 * 'special' SMP interrupts)
-	 */
-	for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
-		int vector = FIRST_EXTERNAL_VECTOR + i;
-		if (vector != IA32_SYSCALL_VECTOR)
-			set_intr_gate(vector, interrupt[i]);
-	}
-
 #ifdef CONFIG_SMP
 	/*
 	 * The reschedule interrupt is a CPU-to-CPU reschedule-helper
@@ -207,6 +193,14 @@ void __init native_init_IRQ(void)
 	/* Low priority IPI to cleanup after moving an irq */
 	set_intr_gate(IRQ_MOVE_CLEANUP_VECTOR, irq_move_cleanup_interrupt);
 #endif
+}
+
+void __init apic_intr_init(void)
+{
+#ifdef CONFIG_SMP
+	smp_intr_init();
+#endif
+
 	alloc_intr_gate(THERMAL_APIC_VECTOR, thermal_interrupt);
 	alloc_intr_gate(THRESHOLD_APIC_VECTOR, threshold_interrupt);
 
@@ -216,6 +210,25 @@ void __init native_init_IRQ(void)
 	/* IPI vectors for APIC spurious and error interrupts */
 	alloc_intr_gate(SPURIOUS_APIC_VECTOR, spurious_interrupt);
 	alloc_intr_gate(ERROR_APIC_VECTOR, error_interrupt);
+}
+
+void __init native_init_IRQ(void)
+{
+	int i;
+
+	init_ISA_irqs();
+	/*
+	 * Cover the whole vector space, no vector can escape
+	 * us. (some of these will be overridden and become
+	 * 'special' SMP interrupts)
+	 */
+	for (i = 0; i < (NR_VECTORS - FIRST_EXTERNAL_VECTOR); i++) {
+		int vector = FIRST_EXTERNAL_VECTOR + i;
+		if (vector != IA32_SYSCALL_VECTOR)
+			set_intr_gate(vector, interrupt[i]);
+	}
+
+	apic_intr_init();
 
 	if (!acpi_ioapic)
 		setup_irq(2, &irq2);