linux-kernel - Re: [BUGFIX PATCH v3 1/4] selftests/ftrace: Fix to check the existence of set_ftrace

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Message-ID: <20191125094445.03d0c8df@gandalf.local.home>
Date:   Mon, 25 Nov 2019 09:44:45 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [BUGFIX PATCH v3 1/4] selftests/ftrace: Fix to check the
 existence of set_ftrace_filter

On Mon, 25 Nov 2019 15:57:00 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> If we run ftracetest on the kernel with CONFIG_DYNAMIC_FTRACE=n,
> there is no set_ftrace_filter and all test cases are failed,
> because reset_ftrace_filter returns an error.
> Let's check whether set_ftrace_filter exists and remove redundant
> set_ftrace_filter from initialize_ftrace().
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  tools/testing/selftests/ftrace/test.d/functions |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
> index 86986c4bba54..19d288cdf336 100644
> --- a/tools/testing/selftests/ftrace/test.d/functions
> +++ b/tools/testing/selftests/ftrace/test.d/functions
> @@ -46,6 +46,9 @@ reset_events_filter() { # reset all current setting filters
>  }
>  
>  reset_ftrace_filter() { # reset all triggers in set_ftrace_filter
> +    if [ ! -f set_ftrace_filter ]; then
> +      return 0
> +    fi
>      echo > set_ftrace_filter
>      grep -v '^#' set_ftrace_filter | while read t; do
>  	tr=`echo $t | cut -d: -f2`
> @@ -93,7 +96,6 @@ initialize_ftrace() { # Reset ftrace to initial-state
>      disable_events
>      [ -f set_event_pid ] && echo > set_event_pid
>      [ -f set_ftrace_pid ] && echo > set_ftrace_pid
> -    [ -f set_ftrace_filter ] && echo | tee set_ftrace_*

The above should be changed to:

	[ -f set_ftrace_notrace ] && echo > set_ftrace_notrace

-- Steve


>      [ -f set_graph_function ] && echo | tee set_graph_*
>      [ -f stack_trace_filter ] && echo > stack_trace_filter
>      [ -f kprobe_events ] && echo > kprobe_events