--- zzzz-none-000/linux-3.10.107/tools/virtio/linux/export.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/tools/virtio/linux/export.h	2021-02-04 17:41:59.000000000 +0000
@@ -1,5 +1,3 @@
-#define EXPORT_SYMBOL(sym)
-#define EXPORT_SYMBOL_GPL(sym)
-#define EXPORT_SYMBOL_GPL_FUTURE(sym)
-#define EXPORT_UNUSED_SYMBOL(sym)
-#define EXPORT_UNUSED_SYMBOL_GPL(sym)
+#define EXPORT_SYMBOL_GPL(sym) extern typeof(sym) sym
+#define EXPORT_SYMBOL(sym) extern typeof(sym) sym
+