request_irq() 函数原型的变化

Linux-2.6.22 中request_irq() 函数原型与之前版本略有改动：

/********************************/
Linux-2.6.22.6
include/linux/irqreturn.h:typedef int irqreturn_t;
include/linux/interrupt.h:typedef irqreturn_t (*irq_handler_t)(int, void *);
kernel/irq/manage.c:int request_irq(
        unsigned int irq,
        irq_handler_t handler,
        unsigned long irqflags,
        const char *devname,
        void *dev_id)

/********************************/
Linux-2.6.13
include/linux/interrupt.h:typedef int irqreturn_t;
kernel/irq/manage.c:int request_irq(
        unsigned int irq,
        irqreturn_t (*handler)(int, void *, struct pt_regs *),
        unsigned long irqflags,
        const char * devname,
        void *dev_id)

/********************************/