ia64: xen: Use irq accessor functions

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/ia64/xen/irq_xen.c b/arch/ia64/xen/irq_xen.c
index a3fb7cf..108bb85 100644
--- a/arch/ia64/xen/irq_xen.c
+++ b/arch/ia64/xen/irq_xen.c
@@ -138,7 +138,6 @@
 __xen_register_percpu_irq(unsigned int cpu, unsigned int vec,
 			struct irqaction *action, int save)
 {
-	struct irq_desc *desc;
 	int irq = 0;
 
 	if (xen_slab_ready) {
@@ -223,8 +222,7 @@
 			 * mark the interrupt for migrations and trigger it
 			 * on cpu hotplug.
 			 */
-			desc = irq_desc + irq;
-			desc->status |= IRQ_PER_CPU;
+			irq_set_status_flags(irq, IRQ_PER_CPU);
 		}
 	}