1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/xen/xenbus/xenbus_probe.h b/drivers/xen/xenbus/xenbus_probe.h
index e09b19415a40..6c5e3185a6a2 100644
--- a/drivers/xen/xenbus/xenbus_probe.h
+++ b/drivers/xen/xenbus/xenbus_probe.h
@@ -34,6 +34,8 @@
 #ifndef _XENBUS_PROBE_H
 #define _XENBUS_PROBE_H
 
+#define XEN_BUS_ID_SIZE                 20
+
 #ifdef CONFIG_XEN_BACKEND
 extern void xenbus_backend_suspend(int (*fn)(struct device *, void *));
 extern void xenbus_backend_resume(int (*fn)(struct device *, void *));
@@ -52,7 +54,7 @@ struct xen_bus_type
 {
         char *root;
         unsigned int levels;
-        int (*get_bus_id)(char bus_id[BUS_ID_SIZE], const char *nodename);
+        int (*get_bus_id)(char bus_id[XEN_BUS_ID_SIZE], const char *nodename);
         int (*probe)(const char *type, const char *dir);
         struct bus_type bus;
 };