We want to convert the drivers over to the new interface and finally
tile to sparse irqs. Implement irq_alloc/free_hwirq() for step by step
migration.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Chris Metcalf <cmetcalf@tilera.com>
---
 arch/tile/include/asm/irq.h |    3 +++
 arch/tile/kernel/irq.c      |   12 ++++++++++++
 2 files changed, 15 insertions(+)

Index: tip/arch/tile/include/asm/irq.h
===================================================================
--- tip.orig/arch/tile/include/asm/irq.h
+++ tip/arch/tile/include/asm/irq.h
@@ -76,4 +76,7 @@ void tile_irq_activate(unsigned int irq,
 
 void setup_irq_regs(void);
 
+unsigned int irq_alloc_hwirq(int node);
+void irq_free_hwirq(unsigned int irq);
+
 #endif /* _ASM_TILE_IRQ_H */
Index: tip/arch/tile/kernel/irq.c
===================================================================
--- tip.orig/arch/tile/kernel/irq.c
+++ tip/arch/tile/kernel/irq.c
@@ -312,4 +312,16 @@ void destroy_irq(unsigned int irq)
 	spin_unlock_irqrestore(&available_irqs_lock, flags);
 }
 EXPORT_SYMBOL(destroy_irq);
+
+unsigned int irq_alloc_hwirq(int node)
+{
+	int ret = create_irq();
+	return ret < 0 ? 0 : ret;
+}
+
+void irq_free_hwirq(unsigned int irq)
+{
+	destroy_irq();
+}
+
 #endif