struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root)
{
	struct cgroup *root_cgrp = kf_root->kn->priv;

	return root_cgrp->root;
}
struct cgroup_root *cgroup_root_from_kf(struct kernfs_root *kf_root)
{
	struct cgroup *root_cgrp = kf_root->kn->priv;

	return root_cgrp->root;
}