+ user-ns-implement-user-ns-unshare-remove-config_user_ns.patch added to -mm tree

[Serge E. Hallyn]

Quoting Eric W. Biederman (ebiederm at xmission.com):
> "Serge E. Hallyn" <serue at us.ibm.com> writes:
> So in summary my only real complaint with removing CONFIG_USER_NS is
> that it appears to me that the code is incomplete and has not been
> closely scrutinized.  As such making it available to end users without

Valid complaint.

> even a warning when that is the case appears irresponsible.
> Especially as much of the code that is sitting in Andrews tree is
> merged into the production kernel, when the window opens.

An experimental marker like Cedric introduced does seem a good idea.

It's just too bad that it complicates the testing quite a bit.
I'm still not sure whether just running ltp on a CONFIG_USER_NS=n
kernel suffices or whether custom testcases are needed.

-serge