Here are the patches (tarball attached), that I've applied to UML 2.6.11 + incrementals, before adding s390-files. These patches are tested a bit on x86, but not on x86_64.
s390 implementation is *not* included in tarball, this will be posted later, when thing are more stable.
Please see patches and commented series-file for further information.
Bodo
patches-2.6.11-prepare-s390.tar.gz
Description: GNU Zip compressed data