--- zzzz-none-000/linux-3.10.107/include/linux/mmiotrace.h	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/include/linux/mmiotrace.h	2021-02-04 17:41:59.000000000 +0000
@@ -106,6 +106,6 @@
 extern void disable_mmiotrace(void);
 extern void mmio_trace_rw(struct mmiotrace_rw *rw);
 extern void mmio_trace_mapping(struct mmiotrace_map *map);
-extern int mmio_trace_printk(const char *fmt, va_list args);
+extern __printf(1, 0) int mmio_trace_printk(const char *fmt, va_list args);
 
 #endif /* _LINUX_MMIOTRACE_H */