func (pl *PodTopologySpread) buildDefaultConstraints(p *v1.Pod, action v1.UnsatisfiableConstraintAction) ([]topologySpreadConstraint, error) {
	constraints, err := pl.filterTopologySpreadConstraints(pl.defaultConstraints, p.Labels, action)
	if err != nil || len(constraints) == 0 {
		return nil, err
	}
	selector := helper.DefaultSelector(p, pl.services, pl.replicationCtrls, pl.replicaSets, pl.statefulSets)

	var err error
	if len(pod.Spec.TopologySpreadConstraints) > 0 {
		s.Constraints, err = pl.filterTopologySpreadConstraints(
			pod.Spec.TopologySpreadConstraints,
			pod.Labels,
			v1.ScheduleAnyway,
		)
		if err != nil {
			return fmt.Errorf("obtaining pod's soft topology spread constraints: %w", err)
		}
	} else {

	if len(pod.Spec.TopologySpreadConstraints) > 0 {
		// We have feature gating in APIServer to strip the spec
		// so don't need to re-check feature gate, just check length of Constraints.
		constraints, err = pl.filterTopologySpreadConstraints(
			pod.Spec.TopologySpreadConstraints,
			pod.Labels,
			v1.DoNotSchedule,
		)
		if err != nil {
			return nil, fmt.Errorf("obtaining pod's hard topology spread constraints: %w", err)
		}