powerpc/64s/exceptions: Change irq reconcile for NMIs from reusing _DAR to RESULT
A spare interrupt stack slot is needed to save irq state when reconciling NMIs (sreset and decrementer soft-nmi). _DAR is used for this, but we want to reconcile machine checks as well, which do use _DAR. Switch to using RESULT instead, as it's used by system calls. Signed-off-by:Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200508043408.886394-4-npiggin@gmail.com
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ac2a2a14
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