linux/Documentation/IRQ.txt
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   1What is an IRQ?
   2
   3An IRQ is an interrupt request from a device.
   4Currently they can come in over a pin, or over a packet.
   5Several devices may be connected to the same pin thus
   6sharing an IRQ.
   7
   8An IRQ number is a kernel identifier used to talk about a hardware
   9interrupt source.  Typically this is an index into the global irq_desc
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