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When sparse IRQs are enabled, it is not safe to assume an IRQ descriptor exists for every possible IRQ. This patch causes init_evtchn_cpu_bindings to skip initialisation of IRQ descriptors which don't exist. Signed-off-by: Alex Nixon <alex.nixon@citrix.com> Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>