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 09:12:07 -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 Sat, 2 May 2020 12:08:42 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> > > diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-hist.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-hist.tc
> > > index ab6bedb25736..b3f70f53ee69 100644
> > > --- a/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-hist.tc
> > > +++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-trace-marker-hist.tc
> > > @@ -30,7 +30,7 @@ fi
> > >  
> > >  echo "Test histogram trace_marker tigger"
> > >  
> > > -echo 'hist:keys=common_pid' > events/ftrace/print/trigger
> > > +echo 'hist:keys=ip' > events/ftrace/print/trigger  
> > 
> > This is doing more than just changing the echo being used. It's changing
> > the test being done.  
> 
> 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.

-- Steve