Re: [PATCH v2] selftests/ftrace: Do not trace do_softirq because of PREEMPT_RT

On 2022-02-10 09:33:56 [+0100], Krzysztof Kozlowski wrote:

The PREEMPT_RT patchset does not use soft IRQs thus trying to filter for do_softirq fails for such kernel:

PREEMPT_RT does use soft IRQs.

echo do_softirq ftracetest: 81: echo: echo: I/O error

Choose some other visible function for the test.

…

--- a/tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func_set_ftrace_file.tc @@ -19,7 +19,7 @@ fail() { # mesg FILTER=set_ftrace_filter FUNC1="schedule" -FUNC2="do_softirq" +FUNC2="scheduler_tick"

What is the purpose of this?

ALL_FUNCS="#### all functions enabled ####"

Sebastian