alpha: kill off alpha_do_IRQ

Good riddance... Nuke a pile of redundant handlers that the
generic code takes care of as well.

Tested-by: Michael Cree <mcree@orcon.net.nz>
Signed-off-by: Kyle McMartin <kyle@redhat.com>
Signed-off-by: Matt Turner <mattst88@gmail.com>
diff --git a/arch/alpha/kernel/sys_mikasa.c b/arch/alpha/kernel/sys_mikasa.c
index 37e5c65..bcc1639 100644
--- a/arch/alpha/kernel/sys_mikasa.c
+++ b/arch/alpha/kernel/sys_mikasa.c
@@ -54,28 +54,11 @@
 	mikasa_update_irq_hw(cached_irq_mask &= ~(1 << (irq - 16)));
 }
 
-static unsigned int
-mikasa_startup_irq(unsigned int irq)
-{
-	mikasa_enable_irq(irq);
-	return 0;
-}
-
-static void
-mikasa_end_irq(unsigned int irq)
-{
-	if (!(irq_to_desc(irq)->status & (IRQ_DISABLED|IRQ_INPROGRESS)))
-		mikasa_enable_irq(irq);
-}
-
 static struct irq_chip mikasa_irq_type = {
 	.name		= "MIKASA",
-	.startup	= mikasa_startup_irq,
-	.shutdown	= mikasa_disable_irq,
-	.enable		= mikasa_enable_irq,
-	.disable	= mikasa_disable_irq,
-	.ack		= mikasa_disable_irq,
-	.end		= mikasa_end_irq,
+	.unmask		= mikasa_enable_irq,
+	.mask		= mikasa_disable_irq,
+	.mask_ack	= mikasa_disable_irq,
 };
 
 static void 
@@ -116,7 +99,7 @@
 
 	for (i = 16; i < 32; ++i) {
 		irq_to_desc(i)->status |= IRQ_LEVEL;
-		set_irq_chip_and_handler(i, &mikasa_irq_type, alpha_do_IRQ);
+		set_irq_chip_and_handler(i, &mikasa_irq_type, handle_level_irq);
 	}
 
 	init_i8259a_irqs();