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Since both legacy and execlists want to populate the RING_CTL register, share the computation of the right bits for the ring->size. We can then stop masking errors and explicitly forbid them during creation! Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20161004201132.21801-1-chris@chris-wilson.co.uk