An empty IPI is useful for cpuidle to wake sleeping CPUs without causing
them to do unnecessary work upon receipt of the IPI. IPI_WAKEUP fills
this use-case nicely, so let it be used outside of the ACPI parking
protocol.
Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
Signed-off-by: Ruchit <ruchitmarathe@gmail.com>