NUMA is bust with CONFIG_PREEMPT=y

[Andrew Morton <akpm@digeo.com>]

#define numa_node_id()  (__cpu_to_node(smp_processor_id()))

Either you're going to have to change that to get_cpu_only_on_numa() and
add the matching put_cpu_only_on_numa()'s, or disable preempt in
the config system.

Now, it's probably the case that this happens to work OK;
if you hop CPUs you just end up doing a suboptimal cross-node
operation.  But it'd be better to fix it up, IMO.
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