1. 根目录:
2. arch
3. alpha
4. include
5. asm
6. hw_irq.h

#ifndef _ALPHA_HW_IRQ_H
#define _ALPHA_HW_IRQ_H


extern volatile unsigned long irq_err_count;
DECLARE_PER_CPU(unsigned long, irq_pmi_count);

#ifdef CONFIG_ALPHA_GENERIC
#define ACTUAL_NR_IRQS	alpha_mv.nr_irqs
#else
#define ACTUAL_NR_IRQS	NR_IRQS
#endif

#endif