【Linux】【中断】：irqreturn.h文件

irqreturn.h文件的内容为： 

#ifndef _LINUX_IRQRETURN_H#define _LINUX_IRQRETURN_H/** * enum irqreturn * @IRQ_NONEinterrupt was not from this device * @IRQ_HANDLEDinterrupt was handled by this device * @IRQ_WAKE_THREADhandler requests to wake the handler thread */enum irqreturn {IRQ_NONE= (0 << 0),IRQ_HANDLED= (1 << 0),IRQ_WAKE_THREAD= (1 << 1),};typedef enum irqreturn irqreturn_t;#define IRQ_RETVAL(x)((x) != IRQ_NONE)#endif

中断处理程序的返回类型均为irqreturn_t，所以在中断处理程序中，我们一般都会加上：

return IRQ_NONE

或者

return IRQ_HANDLED

或者

return IRQ_WAKE_THREAD