> +int task_cgroup_path_from_hierarchy(struct task_struct *task, int hierarchy_id,
> + char *buf, size_t buflen)
> +{
> + struct cgroupfs_root *root;
> + struct cgroup *cgrp = NULL;
> + int ret = -ENOENT;
> +
> + mutex_lock(&cgroup_mutex);
> +
> + root = idr_find(&cgroup_hierarchy_idr, hierarchy_id);
> + if (root) {
> + cgrp = task_cgroup_from_root(task, root);
task_cgroup_from_root() will never return NULL, and there's a BUG_ON(!res) in it.
> + if (cgrp)
> + ret = cgroup_path(cgrp, buf, buflen);
> + }
> +
> + mutex_unlock(&cgroup_mutex);
> +
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(task_cgroup_path_from_hierarchy);
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