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

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Message-ID: <51638463.70009@huawei.com>
Date:	Tue, 9 Apr 2013 11:00:51 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Michal Hocko <mhocko@...e.cz>
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 2013/4/8 22:53, Michal Hocko wrote:
> 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.
> 

yeah it's not a big deal, just want to separate changes to cgroup and memcg.

> 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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