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 15:32:46 -0500
From:   "Zanussi, Tom" <tom.zanussi@...ux.intel.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, 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

Hi,

On 5/7/2020 12:25 PM, Steven Rostedt wrote:
> 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."
> 

With that change,

Reviewed-by: Tom Zanussi <tom.zanussi@...ux.intel.com>

Thanks,

Tom

> Thanks!
> 
> -- Steve
>