(unknown reference) .init.data:(unknown) The function usb_simtec_init() references the (unknown reference) __initdata (unknown). This is often because usb_simtec_init lacks a __initdata annotation or the annotation of (unknown) is wrong. Signed-off-by: Arnd Bergmann Cc: Ben Dooks Cc: Kukjin Kim ˜f;o›6x