Michal Suchanek cb3d6759a9 powerpc/64s: Enable barrier_nospec based on firmware settings ...

Check what firmware told us and enable/disable the barrier_nospec as
appropriate.

We err on the side of enabling the barrier, as it's no-op on older
systems, see the comment for more detail.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

2018-06-03 20:43:45 +10:00

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