> What about arch/powerpc/kernel/exceptions-64e.S, no change required > inside it ? As interru_64.S applies to both 64s and 64e, I would have > expected changes in exceptions_64e too.
As it stands the changes in interrupt_64.S cause non-volatiles to be unconditionally restored. This may lead to a performance regression on Book3E, as previously interrupt_return_srr would restore non-volatiles only after handling a signal, otherwise assuming nvgprs to be intact. As some Book3E systems do feature speculation, it makes sense to perform the same mitigation on these systems as performed on Book3S systems.
