diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
index 84285a6f60b0..dc7ade196798 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_string.tc
@@ -22,6 +22,9 @@ ppc64*)
 ppc*)
   ARG1=%r3
 ;;
+s390*)
+  ARG1=%r2
+;;
 *)
   echo "Please implement other architecture here"
   exit_untested
diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc
index 474ca1a9a088..47d84b5cb6ca 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_syntax.tc
@@ -32,6 +32,10 @@ ppc*)
   GOODREG=%r3
   BADREG=%msr
 ;;
+s390*)
+  GOODREG=%r2
+  BADREG=%s2
+;;
 *)
   echo "Please implement other architecture here"
   exit_untested