These patches were acked by all the people who is interested in
having pid namespace in the kernel and proposed for inclusion.
Made against 2.6.22-rc6-mm1 and checked on i386 and x86_64 nodes.

[PATCH 1/3] - Api rename.
              Acked by Cedric Le Goater.
[PATCH 2/3] - Small improvement of get_pid_ns() call.
              Acked by Cedric.
[PATCH 3/3] - Kmem caches for infinite namespaces nesting.
              Acked by Cedric and Sukadev Bhattiprolu.
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