Re: mmotm 2015-01-22-15-04: qemu failure due to 'mm: memcontrol: remove unnecessary soft limit tree node test'

[Christoph Lameter]

On Fri, 23 Jan 2015, Johannes Weiner wrote:

>         struct mem_cgroup_tree_per_node *rtpn;
>         struct mem_cgroup_tree_per_zone *rtpz;
> -       int tmp, node, zone;
> +       int node, zone;
>
>         for_each_node(node) {

Do for_each_online_node(node) {

instead?

> -               tmp = node;
> -               if (!node_state(node, N_NORMAL_MEMORY))
> -                       tmp = -1;
> -               rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, tmp);
> +               rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL, node);
>                 BUG_ON(!rtpn);
>
>                 soft_limit_tree.rb_tree_per_node[node] = rtpn;
>
> --
>
> Is the assumption of this patch wrong?  Does the specified node have
> to be online for the fallback to work?
>
> Thanks
>
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