drm/i915/execlists: Make submission tasklet hardirq safe
Prepare to allow the execlists submission to be run from underneath a hardirq timer context (and not just the current softirq context) as is required for fast preemption resets and context switches. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NTvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180508210318.10274-1-chris@chris-wilson.co.uk
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