drm/i915: Micro-optimise hotpath through intel_ring_begin()
Typically, there is space available within the ring and if not we have to wait (by definition a slow path). Rearrange the code to reduce the number of branches and stack size for the hotpath, accomodating a slight growth for the wait. v2: Fix the new assert that packets are not larger than the actual ring. v3: Make the parameters unsigned as well to make usage. Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by:
Mika Kuoppala <mika.kuoppala@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170504130846.4807-3-chris@chris-wilson.co.uk
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