CPU 电源状态程度越深，采取的电能节省措施就越多 — 比如说停止处理器时钟或停止外部中断请求。

The deeper the C state, the more power saving steps are taken—steps like stopping the processor clock or stopping interrupts from coming in.

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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。

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.

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在换句话说，一个FIQ仅仅是一个更高优先级的中断请求时，由请求服务期间禁用IRQ和其他FIQ处理程序的优先级。

In other words, an FIQ is just a higher priority interrupt request, that is prioritized by disabling IRQ and other FIQ handlers during request servicing.

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