PPC64 is missing support for the Data Stream control register. This is a 64-bit register.
Created attachment 108079 [details] patch to add DSCR attached patch to add missing DSCR support
Created attachment 108092 [details] patch to add DSCR Updated the patch
Looks OK to me.
patch committed: commit 7fce2c5269f82a7d063c87335a25de84fc9acc64