powerpc/64s: Allow control of RFI flush via debugfs
Expose the state of the RFI flush (enabled/disabled) via debugfs, and allow it to be enabled/disabled at runtime. eg: $ cat /sys/kernel/debug/powerpc/rfi_flush 1 $ echo 0 > /sys/kernel/debug/powerpc/rfi_flush $ cat /sys/kernel/debug/powerpc/rfi_flush 0 Signed-off-by: NMichael Ellerman <mpe@ellerman.id.au> Reviewed-by: NNicholas Piggin <npiggin@gmail.com>
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