> +static inline
> +struct hugetlb_cgroup *hugetlb_cgroup_from_css(struct cgroup_subsys_state *s)
> +{
> + if (s)
Neither cgroup_subsys_state() or task_subsys_state() will ever return NULL,
so here 's' won't be NULL.
> + return container_of(s, struct hugetlb_cgroup, css);
> + return NULL;
> +}
> +
> +static inline
> +struct hugetlb_cgroup *hugetlb_cgroup_from_cgroup(struct cgroup *cgroup)
> +{
> + return hugetlb_cgroup_from_css(cgroup_subsys_state(cgroup,
> + hugetlb_subsys_id));
> +}
> +
> +static inline
> +struct hugetlb_cgroup *hugetlb_cgroup_from_task(struct task_struct *task)
> +{
> + return hugetlb_cgroup_from_css(task_subsys_state(task,
> + hugetlb_subsys_id));
> +}
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