DEFER_QS_PENDING
if (rdp->defer_qs_pending == DEFER_QS_PENDING)
if (rdp->defer_qs_pending != DEFER_QS_PENDING) {
rdp->defer_qs_pending = DEFER_QS_PENDING;
needs_exp && rdp->defer_qs_pending != DEFER_QS_PENDING &&
rdp->defer_qs_pending = DEFER_QS_PENDING;