drm/i915: Enable rcu-only context lookups
Whilst the contents of the context is still protected by the big struct_mutex, this is not much of an improvement. It is just one tiny step towards reducing our BKL. Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Reviewed-by: NJoonas Lahtinen <joonas.lahtinen@linux.intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170620110547.15947-3-chris@chris-wilson.co.uk
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