static ssize_t cgroup_max_depth_write(struct kernfs_open_file *of,
				      char *buf, size_t nbytes, loff_t off)
{
	struct cgroup *cgrp;
	ssize_t ret;
	int depth;

	buf = strstrip(buf);
	if (!strcmp(buf, "max")) {
		depth = INT_MAX;
	} else {
		ret = kstrtoint(buf, 0, &depth);
		if (ret)
			return ret;
	}

	if (depth < 0)
		return -ERANGE;

	cgrp = cgroup_kn_lock_live(of->kn, false);
	if (!cgrp)
		return -ENOENT;

	cgrp->max_depth = depth;

	cgroup_kn_unlock(of->kn);

	return nbytes;
}
static ssize_t cgroup_max_depth_write(struct kernfs_open_file *of,
				      char *buf, size_t nbytes, loff_t off)
{
	struct cgroup *cgrp;
	ssize_t ret;
	int depth;

	buf = strstrip(buf);
	if (!strcmp(buf, "max")) {
		depth = INT_MAX;
	} else {
		ret = kstrtoint(buf, 0, &depth);
		if (ret)
			return ret;
	}

	if (depth < 0)
		return -ERANGE;

	cgrp = cgroup_kn_lock_live(of->kn, false);
	if (!cgrp)
		return -ENOENT;

	cgrp->max_depth = depth;

	cgroup_kn_unlock(of->kn);

	return nbytes;
}