[PATCH] update irq affinity mask when migrating irqs

[Paul Mackerras]

Joel Schopp writes:

> The part of it where we have all the cpus with interrupts disabled 
> running our high priority tasks is VERY performance critical.  Look at 
> the __stop_machine_run() and stop_machine code.  The rest of it is not 
> performance critical at all.

Well... we have to be careful not to take too long, but I really can't
imagine that an extra procedure call and return is going to cause any
problems.

Paul.