[Intel-gfx] [PATCH 04/36] drm/i915: Trim the ironlake+ irq handler

[Chris Wilson]

Quoting Chris Wilson (2020-06-01 13:00:43)
> Quoting Mika Kuoppala (2020-06-01 12:49:49)
> > Chris Wilson <chris at chris-wilson.co.uk> writes:
> > 
> > > Ever noticed that our interrupt handlers are where we spend most of our
> > > time on a busy system? In part this is unavoidable as each interrupt
> > > requires to poll and reset several registers, but we can try and so as
> > > efficiently as possible.
> > >
> > > Function                                     old     new   delta
> > > ilk_irq_handler                             2317    2156    -161

With irqreturn_t ret,

ilk_irq_handler.cold                          63      72      +9
ilk_irq_handler                             2221    2083    -138

I love how it can change so much simply by recompiling the baseline.
-Chris