linux-kernel - Re: [PATCH 1/2] memcg: use existing function to judge root mem cgroup

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Date:	Fri, 22 Jun 2012 14:29:07 +0200
From:	Johannes Weiner <hannes@...xchg.org>
To:	Wanpeng Li <liwp.linux@...il.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>, cgroups@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Han Ying <yinghan@...gle.com>,
	Glauber Costa <glommer@...allels.com>,
	Tejun Heo <tj@...nel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] memcg: use existing function to judge root mem cgroup

On Fri, Jun 22, 2012 at 07:57:22PM +0800, Wanpeng Li wrote:
> From: Wanpeng Li <liwp@...ux.vnet.ibm.com>
> 
> Signed-off-by: Wanpeng Li <liwp.linux@...il.com>
> ---
>  mm/memcontrol.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index f72b5e5..776fc57 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -4873,7 +4873,7 @@ mem_cgroup_create(struct cgroup *cont)
>  			goto free_out;
>  
>  	/* root ? */
> -	if (cont->parent == NULL) {
> +	if (!(mem_cgroup_is_root(cont))) {

cont is struct cgroup *, but this function takes struct mem_cgroup *.
The compiler should have warned you about this.
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