+static umode_t queue_attr_visible(struct kobject *kobj, struct attribute *attr,
+ int n)
+{
+ struct request_queue *q =
+ container_of(kobj, struct request_queue, kobj);
+
+ if (attr == &queue_io_timeout_entry.attr &&
+ (!q->mq_ops || !q->mq_ops->timeout))
+ return 0;
+
+ return attr->mode;
+}
+
+static struct attribute_group queue_attr_group = {
+ .attrs = queue_attrs,
+ .is_visible = queue_attr_visible,
+};
+
+