The callback has been introduced in commit715ca691da("sysbus: add irq_routing_notifier") for use in VFIO platform. Meanwhile, VFIO platform has been removed via commit762c855439("vfio: Remove 'vfio- platform'") which was its only user. Remove this unused code. This reverts commit715ca691da. cc: Cédric Le Goater <clg@redhat.com> Signed-off-by: Bernhard Beschow <shentey@gmail.com> Reviewed-by: Cédric Le Goater <clg@redhat.com> Message-id: 20260308203516.160103-6-shentey@gmail.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>