$ sudo make -C tools/testing/selftests TARGETS=ftrace run_tests ... # [32] ftrace - Max stack tracer [FAIL] ...
Testing using 5.13.0-1002.2
$ sudo make -C tools/testing/ selftests TARGETS=ftrace run_tests
...
# [32] ftrace - Max stack tracer [FAIL]
...
Testing using 5.13.0-1002.2