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With a user_ns reference in struct cred the only user of the user namespace reference in struct user_struct is to keep the uid hash table alive. The user_namespace reference in struct user_struct will be going away soon, and I have removed all of the references. Rename the field from user_ns to _user_ns so that the compiler can verify nothing follows the user struct to the user namespace anymore. Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>