Please consider the following commit for longterm kernels 4.1 and 4.4:
commit c34a69059d7876e0793eb410deedfb08ccb22b02
Author: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Date: Tue May 10 12:10:22 2016 +0200
s390/vmem: fix identity mapping
Strangely enough, it was already included in kernel 3.16.37, but not
in later branches, even though the fix only made it upstream in kernel
v4.7.
Thanks,
--
Jean Delvare
SUSE L3 Support