__do_IRQ - original all in one highlevel IRQ handler
"unsigned int __do_IRQ(unsigned int " "irq" ");"
irqthe interrupt number
__do_IRQ handles all normal device IRQ's (the special SMP cross-CPU interrupts have their own specific handlers).
This is the original x86 implementation which is used for every interrupt type.
ThomasfR Gleixner <tglx@linutronix.de>
Author.IngofR Molnar <mingo@elte.hu>
Author.