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ppc: Fix hreg_store_msr() so that non-HV mode cannot alter MSR:HV
This helper is only used by the various instructions that can alter MSR and not interrupts. Add a comment to that effect to the interrupt code as well in case somebody wants to change this Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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