Re: [PATCH -V9 09/15] mm/hugetlb: Add new HugeTLB cgroup

[Li Zefan <lizefan@huawei.com>]

> +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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