misc:work_on_cpu-dcdbas

It's generally a very bad idea to mug some process's cpumask: it could
legitimately and reasonably be changed by root, which could break us
(if done before our code) or them (if we restore the wrong value).

So we use smp_call_function_single instead of cpumask games.  I hope we
are allowed to trigger the smi from interrupt context.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Matt Domsch <Matt_Domsch@dell.com>
Cc: Douglas_Warzecha@dell.com

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