--- zzzz-none-000/linux-3.10.107/include/linux/swiotlb.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/include/linux/swiotlb.h	2021-02-04 17:41:59.000000000 +0000
@@ -116,4 +116,6 @@
 #endif
 
 extern void swiotlb_print_info(void);
+extern int is_swiotlb_buffer(phys_addr_t paddr);
+
 #endif /* __LINUX_SWIOTLB_H */