linux-kernel - Re: [PATCH] selftests/ftrace: remove _do

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Date:   Fri, 23 Oct 2020 09:35:23 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Alexander Gordeev <agordeev@...ux.ibm.com>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH] selftests/ftrace: remove _do_fork() leftovers

On Fri, 23 Oct 2020 10:52:03 +0200
Alexander Gordeev <agordeev@...ux.ibm.com> wrote:

> diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc
> index acb17ce..0ddb948 100644
> --- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc
> +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-notrace-pid.tc
> @@ -39,7 +39,7 @@ do_test() {
>      disable_tracing
>  
>      echo do_execve* > set_ftrace_filter
> -    echo *do_fork >> set_ftrace_filter
> +    echo kernel_clone >> set_ftrace_filter
>  
>      echo $PID > set_ftrace_notrace_pid
>      echo function > current_tracer
> diff --git a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc
> index 9f0a968..71319b3 100644
> --- a/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc
> +++ b/tools/testing/selftests/ftrace/test.d/ftrace/func-filter-pid.tc
> @@ -39,7 +39,7 @@ do_test() {
>      disable_tracing
>  
>      echo do_execve* > set_ftrace_filter
> -    echo *do_fork >> set_ftrace_filter
> +    echo kernel_clone >> set_ftrace_filter
>  
>      echo $PID > set_ftrace_pid
>      echo function > current_tracer

The issue I have with this, is that I run these tests on older kernels too,
and tests that use to work on older kernels should still work. In fact,
this fails on the kernel I'm currently adding new changes to!

Perhaps we should have:

	# older kernels have do_fork, but newer kernels have kernel_clone
	echo kernel_clone >> set_ftrace_filter || echo *do_fork >> set_ftrace_filter

The above still seems to work for me.

-- Steve