Trying to do a complete solution for kern/145385, Andriy has
raised concerns about IRQ mapping to CPUs; while I've have put
together more pieces of the puzzle, I'm a bit confused how I determine
whether or not an IRQ is available for use.
    Sure, I could linear probe a series of IRQs, but that would
probably be expensive, and different architectures treat IRQs
differently, so building assumptions based on the fact that IRQ
hierarchy is done in a particular order is probably not the best thing
to do.
    I've poked around kern/kern_cpuset.c and kern/kern_intr.c a bit
but I may have missed something important...
Thanks,
-Garrett
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