Re: [patch 3/4] mempolicy: add MPOL_F_STATIC_NODES flag

["KOSAKI Motohiro" <kosaki.motohiro@jp.fujitsu.com>]

Hi David,

In general, I like this feature.
and I found no bug in patch [1/4] and [2/4].

> @@ -218,21 +167,27 @@ static struct mempolicy *mpol_new(enum mempolicy_mode mode,
>                 return ERR_PTR(-ENOMEM);
>         flags &= MPOL_MODE_FLAGS;
>         atomic_set(&policy->refcnt, 1);
> +       cpuset_update_task_memory_state();
> +       nodes_and(cpuset_context_nmask, *nodes, cpuset_current_mems_allowed);
>         switch (mode) {
>         case MPOL_INTERLEAVE:
> -               policy->v.nodes = *nodes;
> +               if (nodes_empty(*nodes))
> +                       return ERR_PTR(-EINVAL);

need kmem_cache_free(policy_cache, policy) before return?

> +               policy->v.nodes = cpuset_context_nmask;
>                 if (nodes_weight(policy->v.nodes) == 0) {
>                         kmem_cache_free(policy_cache, policy);
>                         return ERR_PTR(-EINVAL);
>                 }
>                 break;
>         case MPOL_PREFERRED:
> -               policy->v.preferred_node = first_node(*nodes);
> +               policy->v.preferred_node = first_node(cpuset_context_nmask);
>                 if (policy->v.preferred_node >= MAX_NUMNODES)
>                         policy->v.preferred_node = -1;
>                 break;
>         case MPOL_BIND:
> -               policy->v.zonelist = bind_zonelist(nodes);
> +               if (nodes_empty(*nodes))
> +                       return ERR_PTR(-EINVAL);

ditto

Thanks!