Quoting Tvrtko Ursulin (2019-12-03 14:06:51)
> On 02/12/2019 11:08, Chris Wilson wrote:
> > Only signal the breadcrumbs from inside the irq_work, simplifying our
> > interface and calling conventions.
> Making Icelake signaling latency look better? :) A few more words about 
> motivation would be good.

At this point, we're just removing a few cts/sts
(spin_lock_irqsave/restore) from the execlists paths. It just makes me
feel happier to have fewer _irq dotted around prior to RT. The trade-off
is that they will hound us for using irq_work instead! :)
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