if !ok {
		return nil, fmt.Errorf("%+v convert to podtopologyspread.preFilterState error", c)
	}
	return s, nil
}

// calPreFilterState computes preFilterState describing how pods are spread on topologies.
func (pl *PodTopologySpread) calPreFilterState(ctx context.Context, pod *v1.Pod) (*preFilterState, error) {
	constraints, err := pl.getConstraints(pod)
	if err != nil {