[PATCH 4/4] Add irq debugfs and virq_mapping for getting the virq to irq host's hwirq mapping list.

[Segher Boessenkool]

>> Or put the whole IRQ tree under sysfs generically...
>
> Except that there is no such thing as an IRQ tree in the generic 
> code...

Darn, I thought the whole cascading thing was done in
generic code now.  Oh well...


Segher