linux-kernel - Re: [PATCH 09/24] selftests: ftrace: return Kselftest Skip code for skipped tests

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Message-ID: <34a4aa44-75f0-b868-cfc8-37fc716af0a5@kernel.org>
Date:   Thu, 10 May 2018 14:18:16 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     rostedt@...dmis.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>
Subject: Re: [PATCH 09/24] selftests: ftrace: return Kselftest Skip code for
 skipped tests

Hi Masami,

On 05/07/2018 09:38 PM, Masami Hiramatsu wrote:
> On Fri,  4 May 2018 19:13:13 -0600
> "Shuah Khan (Samsung OSG)" <shuah@...nel.org> wrote:
> 
>> When ftrace test is skipped because of unmet dependencies and/or
>> unsupported configuration, it returns 0 which is treated as a pass
>> by the Kselftest framework. This leads to false positive result even
>> when the test could not be run.
>>
>> Change it to return kselftest skip code when a test gets skipped to
>> clearly report that the test could not be run.
>>
>> Kselftest framework SKIP code is 4 and the framework prints appropriate
>> messages to indicate that the test is skipped.
>>
>> Signed-off-by: Shuah Khan (Samsung OSG) <shuah@...nel.org>
>> ---
>>  tools/testing/selftests/ftrace/ftracetest | 8 ++++++--
>>  1 file changed, 6 insertions(+), 2 deletions(-)
>>
>> diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
>> index f9a9d424c980..b731c8cdcffb 100755
>> --- a/tools/testing/selftests/ftrace/ftracetest
>> +++ b/tools/testing/selftests/ftrace/ftracetest
>> @@ -23,6 +23,9 @@ echo "		            If <dir> is -, all logs output in console only"
>>  exit $1
>>  }
>>  
>> +# Kselftest framework requirement - SKIP code is 4.
>> +ksft_skip=4
>> +
>>  errexit() { # message
>>    echo "Error: $1" 1>&2
>>    exit 1
>> @@ -30,7 +33,8 @@ errexit() { # message
>>  
>>  # Ensuring user privilege
>>  if [ `id -u` -ne 0 ]; then
>> -  errexit "this must be run by root user"
>> +  echo "Skipping: test must be run by root user"
>> +  exit $ksft_skip
>>  fi
>>  
>>  # Utilities
>> @@ -249,7 +253,7 @@ trap 'SIG_RESULT=$UNTESTED' $SIG_UNTESTED
>>  SIG_UNSUPPORTED=$((SIG_BASE + UNSUPPORTED))
>>  exit_unsupported () {
>>    kill -s $SIG_UNSUPPORTED $SIG_PID
>> -  exit 0
>> +  exit $ksft_skip
> 
> This should return 0. If you want to change the result code,
> you have to change the last part as below.
> (Note that we need a switch option of return code, so that
>  ftracetest user can continue to use same way...)

Doesn't this existing option take care of this:

--fail-unsupported Treat UNSUPPORTED as a failure"

Is there a need for another. This indicates that the default
mode is UNSUPPORTED isn't a failure.

> 
> diff --git a/tools/testing/selftests/ftrace/ftracetest b/tools/testing/selftests/ftrace/ftracetest
> index f9a9d424c980..d6ce56a2a937 100755
> --- a/tools/testing/selftests/ftrace/ftracetest
> +++ b/tools/testing/selftests/ftrace/ftracetest
> @@ -326,5 +326,15 @@ prlog "# of unsupported: " `echo $UNSUPPORTED_CASES | wc -w`
>  prlog "# of xfailed: " `echo $XFAILED_CASES | wc -w`
>  prlog "# of undefined(test bug): " `echo $UNDEFINED_CASES | wc -w`
>  
> -# if no error, return 0
> -exit $TOTAL_RESULT
> +# following kselftest result code
> +if [ $UNSUPPORTED_CASES -ne 0 -o \
> +       $UNTESTED_CASES -ne 0 -o \
> +       $UNRESOLVED_CASES -ne 0]; then # There are skipped tests
> +  exit 4
> +elif [ $XAILED_CASES -ne 0 -o ]; then # XFAILs
> +  exit 2
> +elif [ $FAILED_CASES -ne 0 -o ]; then # FAILs
> +  exit 1
> +else # PASS
> +  exit 0
> +fi
> 

Thanks for pointing out the right change to make.

-- Shuah