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

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Date:   Mon, 25 Nov 2019 20:54:29 -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 Tue, 26 Nov 2019 09:13:45 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > > @@ -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  
> 
> Ah, good point! I think that should be done by another patch, since
> it will improve ftracetest.

No, it belongs in this patch, because you are removing:

	[ -f set_ftrace_filter ] && echo | tee set_ftrace_*

which is equivalent to:

	[ -f set_ftrace_filter ] && echo > set_ftrace_filter
	[ -f set_ftrace_filter ] && echo > set_ftrace_notrace

as the "tee set_ftrace_*" covers both.

Without this change, this patch removes the update to
set_ftrace_notrace.

-- Steve