The Tumbleweed kmod and kernel are patched to install modules into
/usr/lib/modules (the --with-module-directory configure argument.)
This is not compatible with upstream kernel, and upstream rejected patch to
make the kernel build system detect this. Suggested solution is to use
make MODLIB='$(INSTALL_MOD_PATH)/usr/lib/modules/$(KERNELRELEASE)'
when building the upstream kernel.
