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drm/i915: Reduce locking in execlist command submission
This eliminates six needless spin lock/unlock pairs when writing out ELSP. v2: Respin with my preferred colour. v3: Mostly back to the original colour Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> [v1] Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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