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-rw-r--r--include/hw/xen/xen-bus-helper.h6
-rw-r--r--include/hw/xen/xen-bus.h3
2 files changed, 6 insertions, 3 deletions
diff --git a/include/hw/xen/xen-bus-helper.h b/include/hw/xen/xen-bus-helper.h
index 629a904d1a..8782f30550 100644
--- a/include/hw/xen/xen-bus-helper.h
+++ b/include/hw/xen/xen-bus-helper.h
@@ -31,10 +31,12 @@ void xs_node_printf(struct xs_handle *xsh,  xs_transaction_t tid,
 /* Read from node/key unless node is empty, in which case read from key */
 int xs_node_vscanf(struct xs_handle *xsh,  xs_transaction_t tid,
                    const char *node, const char *key, Error **errp,
-                   const char *fmt, va_list ap);
+                   const char *fmt, va_list ap)
+    G_GNUC_SCANF(6, 0);
 int xs_node_scanf(struct xs_handle *xsh,  xs_transaction_t tid,
                   const char *node, const char *key, Error **errp,
-                  const char *fmt, ...);
+                  const char *fmt, ...)
+    G_GNUC_SCANF(6, 7);
 
 /* Watch node/key unless node is empty, in which case watch key */
 void xs_node_watch(struct xs_handle *xsh, const char *node, const char *key,
diff --git a/include/hw/xen/xen-bus.h b/include/hw/xen/xen-bus.h
index 713e763348..4d966a2dbb 100644
--- a/include/hw/xen/xen-bus.h
+++ b/include/hw/xen/xen-bus.h
@@ -94,7 +94,8 @@ void xen_device_frontend_printf(XenDevice *xendev, const char *key,
     G_GNUC_PRINTF(3, 4);
 
 int xen_device_frontend_scanf(XenDevice *xendev, const char *key,
-                              const char *fmt, ...);
+                              const char *fmt, ...)
+    G_GNUC_SCANF(3, 4);
 
 void xen_device_set_max_grant_refs(XenDevice *xendev, unsigned int nr_refs,
                                    Error **errp);