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On POWER10, the automatic "save & restore" of interrupt context is always available. Provide a way to deactivate it for tests or performance. Signed-off-by: Cédric Le Goater <clg@kaod.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20211105102636.1016378-11-clg@kaod.org