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When initiating I/O on a multiqueue and multi-IRQ device, we may want to select a queue for which the response will be handled on the same or a nearby CPU. This requires a reverse-map of IRQ affinity. Add a notification mechanism to support this. This is based closely on work by Thomas Gleixner <[email protected]>. Signed-off-by: Ben Hutchings <[email protected]> Cc: [email protected] Cc: Tom Herbert <[email protected]> Cc: David Miller <[email protected]> LKML-Reference: <1295470904.11126.84.camel@bwh-desktop> Signed-off-by: Thomas Gleixner <[email protected]>