[PATCH] memcg: do not expose uninitialized mem_cgroup_per_node to world

[KAMEZAWA Hiroyuki]

On Wed, 8 Jun 2011 14:09:51 -0700
Andrew Morton <akpm at linux-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