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This will let userland only try to use the new ring when the appropriate kernel is present Signed-off-by: Xiang, Haihao <haihao.xiang@intel.com> Reviewed-by: Damien Lespiau <damien.lespiau@intel.com> Signed-off-by: Ben Widawsky <ben@bwidawsk.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>