powerpc/copro: Fix faulting kernel segments
This fixes calculating the key bits (KP and KS) in the SLB VSID for kernel mappings. I'm not CCing this to stable as there are no uses of this currently. Signed-off-by: NMichael Neuling <mikey@neuling.org> Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au>
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