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Date:   Fri, 1 May 2020 09:38:59 -0600
From:   shuah <shuah@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     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>, skhan@...uxfoundation.org,
        shuah <shuah@...nel.org>
Subject: Re: [PATCH 2/3] selftests/ftrace: Pick only the first kprobe event to
 test

On 5/1/20 8:17 AM, Steven Rostedt wrote:
> On Fri,  1 May 2020 22:37:51 +0900
> Masami Hiramatsu <mhiramat@...nel.org> wrote:
> 
>> Since the kprobe/kprobe_args_type.tc reads out all event logs
>> from the trace buffer, the test can fail if there is another
>> fork event happens.
>> Use head command to pick only the first kprobe event from
>> the trace buffer to test the argument types.
>>
>> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
>> ---
>>   .../ftrace/test.d/kprobe/kprobe_args_type.tc       |    2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
>> index 1bcb67dcae26..81490ecaaa92 100644
>> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
>> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
>> @@ -38,7 +38,7 @@ for width in 64 32 16 8; do
>>     echo 0 > events/kprobes/testprobe/enable
>>   
>>     : "Confirm the arguments is recorded in given types correctly"
>> -  ARGS=`grep "testprobe" trace | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
>> +  ARGS=`grep "testprobe" trace | head -n 1 | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
>>     check_types $ARGS $width
>>   
>>     : "Clear event for next loop"
> 
> I think I've manually added this exact change to my tests to keep it from
> failing.
> 
> Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> 

Does this conflict with:

Author: Xiao Yang <yangx.jy@...fujitsu.com>
Date:   Tue Apr 7 14:34:19 2020 +0800

     selftests/ftrace: Check the first record for kprobe_args_type.tc

https://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest.git/commit/?h=next&id=f0c0d0cf590f71b2213b29a7ded2cde3d0a1a0ba

I went into mainline yesterday in my rc4 pull request.

Exact change it appears.

diff --git 
a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc 
b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
index 1bcb67dcae26..81490ecaaa92 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_type.tc
@@ -38,7 +38,7 @@ for width in 64 32 16 8; do
    echo 0 > events/kprobes/testprobe/enable

    : "Confirm the arguments is recorded in given types correctly"
-  ARGS=`grep "testprobe" trace | sed -e 's/.* arg1=\(.*\) arg2=\(.*\) 
arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
+  ARGS=`grep "testprobe" trace | head -n 1 | sed -e 's/.* arg1=\(.*\) 
arg2=\(.*\) arg3=\(.*\) arg4=\(.*\)/\1 \2 \3 \4/'`
    check_types $ARGS $width

    : "Clear event for next loop"

thanks,
-- Shuah

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