linux-kernel - Re: [PATCH] memcg: do not expose uninitialized mem_cgroup_per

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Message-Id: <20110609084422.1b285cf3.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 9 Jun 2011 08:44:22 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Igor Mammedov <imammedo@...hat.com>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	Michal Hocko <mhocko@...e.cz>, linux-kernel@...r.kernel.org,
	balbir@...ux.vnet.ibm.com, linux-mm@...ck.org,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org
Subject: Re: [PATCH] memcg: do not expose uninitialized mem_cgroup_per_node
 to world

On Wed, 8 Jun 2011 14:09:51 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> 
> The original patch:
> 
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -4707,7 +4707,6 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
>  	if (!pn)
>  		return 1;
>  
> -	mem->info.nodeinfo[node] = pn;
>  	for (zone = 0; zone < MAX_NR_ZONES; zone++) {
>  		mz = &pn->zoneinfo[zone];
>  		for_each_lru(l)
> @@ -4716,6 +4715,7 @@ static int alloc_mem_cgroup_per_zone_info(struct mem_cgroup *mem, int node)
>  		mz->on_tree = false;
>  		mz->mem = mem;
>  	}
> +	mem->info.nodeinfo[node] = pn;
>  	return 0;
>  }
> 
> looks like a really good idea.  But it needs a new changelog and I'd be
> a bit reluctant to merge it as it appears that the aptch removes our
> only known way of reproducing a bug.
> 
> So for now I think I'll queue the patch up unchangelogged so the issue
> doesn't get forgotten about.
> 

Hmm, queued as clean up ? If so, I'll Ack.

Thanks,
-Kame

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