linux-kernel - Re: [PATCH 3/3] selftests/ftrace: Use /bin/echo instead of built-in echo

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Date:   Thu, 7 May 2020 13:25:39 -0400
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,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Li Philip <philip.li@...el.com>,
        Liu Yiding <yidingx.liu@...el.com>
Subject: Re: [PATCH 3/3] selftests/ftrace: Use /bin/echo instead of built-in
 echo

On Fri, 8 May 2020 00:50:28 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > > Yes, I need Tom's review for this change. As far as I can test, this
> > > fixes the test failure. If this isn't acceptable, we can use "alias echo=echo"
> > > for this test case.
> > >   
> > 
> > I still don't see how changing "keys=common_pid" to "keys=ip" has anything
> > to do with the echo patch. If that is a problem, it should be a different
> > patch with explanation to why "keys=common_pid" is broken.  
> 
> This test case uses a trace_marker event to make a histogram with
> the common_pid key, and it expects the "echo" command is built-in command
> so that the pid is same while writing several events to trace_marker.
> I changed it to "ip" which is always same if trace_marker interface is
> used.

Can you explicitly state that in your change log? It wasn't obvious from
what you meant with:

"This also fixes some test cases which expects built-in echo command."

Thanks!

-- Steve