GLD_SAVE_MBLK_VTAG
GLD_SAVE_MBLK_VTAG(mp, raw_vtag);
GLD_SAVE_MBLK_VTAG(savemp, GLD_TCI2VTAG(tci));
#define GLD_CLEAR_MBLK_VTAG(mp) GLD_SAVE_MBLK_VTAG(mp, 0)