RE: [RFC][PATCH] Document what in IRQ is.

[Brown, Len]

>Linux does not have generic infrastructure to allow two interrupt
>sources to share the same token passed to the kernel. 

On i386 and x86_64 io_apic.c, see irq_pin_list
This advertises to support multiple pins per IRQ.

I suspect this code never runs, and simply adds
complexity to code that has no shortage of complexity.

If somebody can explain to me what a "shared ISA-space IRQ"
is supposed to be, I'm all ears.  I've had a BUG() in this
code for a while waiting for it to be used, and never seen it fire.

If we can get rid of that concept, then we have a 1:1 mapping
between irqs and apic:pin.  Possibly this simplification would
be helpful as we re-think how the mapping from cpu:vector -> irq works.

-Len
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