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

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Message-ID: <4FD9A6B6.50503@huawei.com>
Date:	Thu, 14 Jun 2012 16:54:14 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
CC:	<linux-mm@...ck.org>, <kamezawa.hiroyu@...fujitsu.com>,
	<dhillf@...il.com>, <rientjes@...gle.com>, <mhocko@...e.cz>,
	<akpm@...ux-foundation.org>, <hannes@...xchg.org>,
	<linux-kernel@...r.kernel.org>, <cgroups@...r.kernel.org>
Subject: Re: [PATCH -V9 09/15] mm/hugetlb: Add new HugeTLB cgroup

> +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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