xen: unpin initial Xen pagetable once we're finished with it
Unpin the Xen-provided pagetable once we've finished with it, so it doesn't cause stray references which cause later swapper_pg_dir pagetable updates to fail. Signed-off-by: NJeremy Fitzhardinge <jeremy@xensource.com> Tested-by: NJody Belka <knew-linux@pimb.org> Signed-off-by: NIngo Molnar <mingo@elte.hu>
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