+#if LINUX_VERSION_CODE < KERNEL_VERSION(5,5,0)
+static unsigned int *can327_mailbox_read(struct can_rx_offload *offload,
+ struct can_frame *cf,
+ u32 *timestamp, unsigned int n)
+{
+ WARN_ON_ONCE(1); /* This function is a dummy, so don't call it! */
+
+ return -ENOBUFS;
+}
+#else /* Since 4e9c9484b085 (included in v5.5) */