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This is preparatory work for Execlists: we plan to use it later to allocate our own context objects (since Logical Ring Contexts do not have the same kind of backing objects). No functional changes. Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Oscar Mateo <oscar.mateo@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>