Execute a Return from Interrupt instruction;
执行中断返回指令;
If an interrupt keeps coming in and there is no registered handler for that device (for instance, all drivers return IRQ_NONE), then the kernel can block interrupts from that device.
如果一个中断请求不断到来而且没有注册那个设备的处理程序(例如,所有的驱动程序都返回IRQ_NONE),内核就会忽略来自那个设备的中断。
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