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

[Michal Hocko <mhocko@suse.cz>]

On Fri 22-06-12 19:57:22, Wanpeng Li wrote:
> From: Wanpeng Li <liwp@linux.vnet.ibm.com>
> 
> Signed-off-by: Wanpeng Li <liwp.linux@gmail.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))) {

This is not correct. mem_cgroup_is_root takes mem_cgroup and you are
giving it cgroup, see?

>  		int cpu;
>  		enable_swap_cgroup();
>  		parent = NULL;
> -- 
> 1.7.9.5
> 
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-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic

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