linux-kernel - Re: [PATCH v2 3/8] cgroup: implement cgroup_from

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Message-ID: <20130724141045.GF2540@dhcp22.suse.cz>
Date:	Wed, 24 Jul 2013 16:10:45 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Glauber Costa <glommer@...allels.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH v2 3/8] cgroup: implement cgroup_from_id()

On Wed 24-07-13 18:00:39, Li Zefan wrote:
> This will be used as a replacement for css_lookup().
> 
> There's a difference with cgroup id and css id. cgroup id starts with 0,
> while css id starts with 1.
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

Reviewed-by: Michal Hocko <mhocko@...e.cz>

Typo fix bellow
[...]
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index ee3c02e..9b27775 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -5536,6 +5536,22 @@ struct cgroup_subsys_state *cgroup_css_from_dir(struct file *f, int id)
>  	return css ? css : ERR_PTR(-ENOENT);
>  }
>  
> +/**
> + * cgroup_from_id - lookup cgroup by id
> + * @ss: cgroup subsys to be looked into
> + * @id: the cgroup id
> + *
> + * Returns the cgroup is there's valid one with @id, otherwise returns Null.

s/ is / if /

> + * Should be called under rcu_readlock().
> + */
> +struct cgroup *cgroup_from_id(struct cgroup_subsys *ss, int id)
> +{
> +	rcu_lockdep_assert(rcu_read_lock_held(),
> +			   "cgroup_from_id() needs rcu_read_lock()"
> +			   " protection");
> +	return idr_find(&ss->root->cgroup_idr, id);
> +}
> +
>  #ifdef CONFIG_CGROUP_DEBUG
>  static struct cgroup_subsys_state *debug_css_alloc(struct cgroup *cgrp)
>  {
> -- 
> 1.8.0.2

-- 
Michal Hocko
SUSE Labs
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