With the usrmerge patches, depmod now accesses $base/usr/lib/modules instead of
$base/lib/modules. Unfortunately, scripts/depmod.sh in the kernel sources
cannot cope with that and fails with a slightly confusing message:

depmod: ERROR: could not open directory
/srv/research/dynswiotlb-9p/usr/lib/modules/99.98.6.5.0-devel+: No such file or
directory

I can see how this is fixed for RPM builds
(https://github.com/SUSE/kernel-source/commit/da84579e78f4c4efa5b3b910484fdaedc79fefec),
but I can no longer run "make modules_install" from the expanded kernel tree.