DTRACE_MSTATE_TIMESTAMP
if (!(mstate->dtms_present & DTRACE_MSTATE_TIMESTAMP)) {
mstate->dtms_present |= DTRACE_MSTATE_TIMESTAMP;
mstate->dtms_present &= ~DTRACE_MSTATE_TIMESTAMP;
if (!(mstate.dtms_present & DTRACE_MSTATE_TIMESTAMP)) {
mstate.dtms_present |= DTRACE_MSTATE_TIMESTAMP;