1. 根目录:
2. include
3. asm-generic
4. irq.h

#ifndef __ASM_GENERIC_IRQ_H
#define __ASM_GENERIC_IRQ_H

/*
 * NR_IRQS is the upper bound of how many interrupts can be handled
 * in the platform. It is used to size the static irq_map array,
 * so don't make it too big.
 */
#ifndef NR_IRQS
#define NR_IRQS 64
#endif

static inline int irq_canonicalize(int irq)
{
	return irq;
}

#endif /* __ASM_GENERIC_IRQ_H */