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In places, we assume that RCS exists. This has been true forever, but let us catch this failure during bringup by adding an explicit check that we do have an RCS engine. v2: Make use of HAS_ENGINE (Tvrtko) Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170411165658.23828-1-chris@chris-wilson.co.uk