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

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Date:   Fri, 11 May 2018 15:09:28 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Shuah Khan <shuah@...nel.org>
Cc:     rostedt@...dmis.org, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/24] selftests: ftrace: return Kselftest Skip code for
 skipped tests

On Thu, 10 May 2018 14:18:16 -0600
Shuah Khan <shuah@...nel.org> wrote:

> 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"

No, that is an opposite option... it makes UNSUPPORTED result
as a failure. What the option we need is to ignore UNSUPPORTED
results because it is expected.

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

Right, currently UNSUPPORTED/UNRESOLVED/UNTESTED are not 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

Ah, I missed to remove the last "-o"

> > +  exit 2
> > +elif [ $FAILED_CASES -ne 0 -o ]; then # FAILs

ditto.

Thanks,

> > +  exit 1
> > +else # PASS
> > +  exit 0
> > +fi
> > 
> 
> Thanks for pointing out the right change to make.
> 
> -- Shuah
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>