_DRM_VBLANK_TYPES_MASK
(vblwait->request.type & (_DRM_VBLANK_TYPES_MASK |
~(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
(_DRM_VBLANK_TYPES_MASK | _DRM_VBLANK_FLAGS_MASK |
switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {