genirq: Add fasteoi IPI flow
For irqchips using the fasteoi flow, IPIs are a bit special. They need to be EOI'd early (before calling the handler), as funny things may happen in the handler (they do not necessarily behave like a normal interrupt). Reviewed-by:Valentin Schneider <valentin.schneider@arm.com> Signed-off-by:
Marc Zyngier <maz@kernel.org>
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