On Thu, Jul 14, 2016 at 07:12:19PM -0700, Andrey Vagin wrote:

+struct ns_common *ns_get_owner(struct ns_common *ns)
+{
+	…
+	return &get_user_ns(user_ns)->ns;
+}

Is there a reason to return the generic ‘struct ns_common *’ here
instead of ‘struct user_namespace *’?  The current use case doesn't
need access to the additional information, but future ng_get_owner
callers might, and we know the returned namespace (if any) will be a
user namespace.

Cheers,
Trevor

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