linux-kernel - Re: [PATCH 4/8] memcg: convert to use cgroup_from

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Message-ID: <20130408145333.GL17178@dhcp22.suse.cz>
Date:	Mon, 8 Apr 2013 16:53:33 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.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 4/8] memcg: convert to use cgroup_from_id()

On Mon 08-04-13 16:21:29, Li Zefan wrote:
> This is a preparation to kill css_id.
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

I would be tempted to stuff this into the same patch which introduces
cgroup_from_id but this is just a minor thing.

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

> ---
>  mm/memcontrol.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 14f1375..3561d0b 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2769,15 +2769,15 @@ static void __mem_cgroup_cancel_local_charge(struct mem_cgroup *memcg,
>   */
>  static struct mem_cgroup *mem_cgroup_lookup(unsigned short id)
>  {
> -	struct cgroup_subsys_state *css;
> +	struct cgroup *cgrp;
>  
>  	/* ID 0 is unused ID */
>  	if (!id)
>  		return NULL;
> -	css = css_lookup(&mem_cgroup_subsys, id);
> -	if (!css)
> +	cgrp = cgroup_from_id(&mem_cgroup_subsys, id);
> +	if (!cgrp)
>  		return NULL;
> -	return mem_cgroup_from_css(css);
> +	return mem_cgroup_from_cont(cgrp);
>  }
>  
>  struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
> -- 
> 1.8.0.2
> 
> --
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-- 
Michal Hocko
SUSE Labs
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