arch/ia64/include/asm/irq_remapping.h - linux - Git at Google

 #ifndef __IA64_INTR_REMAPPING_H
 #define __IA64_INTR_REMAPPING_H
 #define irq_remapping_enabled 0
 #define dmar_alloc_hwirq	create_irq
 #define dmar_free_hwirq		destroy_irq
 #endif
	#ifndef __IA64_INTR_REMAPPING_H
	#define __IA64_INTR_REMAPPING_H
	#define irq_remapping_enabled 0
	#define dmar_alloc_hwirq create_irq
	#define dmar_free_hwirq destroy_irq
	#endif