Another solution would be, once 4.1 gets out to unpack the base41.tgz, etc41.tgz and comp41.tgz into /usr/somewhere then unpack or checkout using cvs the 4.1 kernel sources in there as well.
Once you are in this situation you can chroot to this new fake 4.1 system: chroot /usr/somewhere /bin/sh Once in the chroot, you can build your raid enabled kernel. This method also works for building a release(8).
