genirq: Remove real old transition functions

These transition helpers are stale for years now. Remove them.
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

kernel/irq/autoprobe.c

@@ -46,12 +46,6 @@ unsigned long probe_irq_on(void)
 	for_each_irq_desc_reverse(i, desc) {
 		raw_spin_lock_irq(&desc->lock);
 		if (!desc->action && irq_settings_can_probe(desc)) {
-			/*
-			 * An old-style architecture might still have
-			 * the handle_bad_irq handler there:
-			 */
-			compat_irq_chip_set_default_handler(desc);
-
 			/*
 			 * Some chips need to know about probing in
 			 * progress:

kernel/irq/chip.c

@@ -644,19 +644,11 @@ __set_irq_handler(unsigned int irq, irq_flow_handler_t handle, int is_chained,
 		return;
 	}
 
-	if (!handle)
+	if (!handle) {
 		handle = handle_bad_irq;
-	else if (desc->irq_data.chip == &no_irq_chip) {
-		printk(KERN_WARNING "Trying to install %sinterrupt handler "
-		       "for IRQ%d\n", is_chained ? "chained " : "", irq);
-		/*
-		 * Some ARM implementations install a handler for really dumb
-		 * interrupt hardware without setting an irq_chip. This worked
-		 * with the ARM no_irq_chip but the check in setup_irq would
-		 * prevent us to setup the interrupt at all. Switch it to
-		 * dummy_irq_chip for easy transition.
-		 */
-		desc->irq_data.chip = &dummy_irq_chip;
+	} else {
+		if (WARN_ON(desc->irq_data.chip == &no_irq_chip))
+			return;
 	}
 
 	chip_bus_lock(desc);

kernel/irq/internals.h

@@ -74,9 +74,6 @@ enum {
 /* Set default functions for irq_chip structures: */
 extern void irq_chip_set_defaults(struct irq_chip *chip);
 
-/* Set default handler: */
-extern void compat_irq_chip_set_default_handler(struct irq_desc *desc);
-
 extern int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
 		unsigned long flags);
 extern void __disable_irq(struct irq_desc *desc, unsigned int irq, bool susp);

kernel/irq/manage.c

@@ -540,17 +540,6 @@ int can_request_irq(unsigned int irq, unsigned long irqflags)
 	return !action;
 }
 
-void compat_irq_chip_set_default_handler(struct irq_desc *desc)
-{
-	/*
-	 * If the architecture still has not overriden
-	 * the flow handler then zap the default. This
-	 * should catch incorrect flow-type setting.
-	 */
-	if (desc->handle_irq == &handle_bad_irq)
-		desc->handle_irq = NULL;
-}
-
 int __irq_set_trigger(struct irq_desc *desc, unsigned int irq,
 		      unsigned long flags)
 {
@@ -912,8 +901,7 @@ __setup_irq(unsigned int irq, struct irq_desc *desc, struct irqaction *new)
 
 			if (ret)
 				goto out_mask;
-		} else
-			compat_irq_chip_set_default_handler(desc);
+		}
 
 		desc->istate &= ~(IRQS_AUTODETECT | IRQS_SPURIOUS_DISABLED | \
 				  IRQS_INPROGRESS | IRQS_ONESHOT | \