--- zzzz-none-000/linux-3.10.107/tools/perf/util/usage.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/tools/perf/util/usage.c	2021-02-04 17:41:59.000000000 +0000
@@ -50,6 +50,11 @@
 	die_routine = routine;
 }
 
+void set_warning_routine(void (*routine)(const char *err, va_list params))
+{
+	warn_routine = routine;
+}
+
 void usage(const char *err)
 {
 	usage_routine(err);