linux-kernel - Re: [PATCH v2] selftests/intel

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Message-ID: <CABq9Dx6b0TxXfvsmaaAMG+O=x8v3pD4CY2TTowcGzkL2q=Q1Yg@mail.gmail.com>
Date: Mon, 21 Oct 2024 17:04:12 +0200
From: Alessandro Zanni <alessandro.zanni87@...il.com>
To: Shuah Khan <skhan@...uxfoundation.org>
Cc: shuah@...nel.org, linux-kselftest@...r.kernel.org, 
	linux-kernel@...r.kernel.org, anupnewsmail@...il.com
Subject: Re: [PATCH v2] selftests/intel_pstate: fix operand expected

> On 24/10/14 06:05, Shuah Khan wrote:
> > On 10/14/24 11:21, Alessandro Zanni wrote:
> > > This fix solves theses errors, when calling kselftest with
> > > targets "intel_pstate":
> > >
> > > ./run.sh: line 90: / 1000: syntax error: operand expected (error token is "/ 1000")
> > >
> > > ./run.sh: line 92: / 1000: syntax error: operand expected (error token is "/ 1000")
> > >
> > > To error was found by running tests manually with the command:
> > > make kselftest TARGETS=intel_pstate
> > >
> > > Signed-off-by: Alessandro Zanni <alessandro.zanni87@...il.com>
> > > ---
> > >
> > > Notes:
> > >      v2: removed debug echos
> >
> > See my comments on your v1. It would help to wait a bit
> > to send v2.
>
> Ok and thanks for the comments.
>
> > I can't reproduce this problem on Linux 6.12-rc3.
> > What's you environment like?
>
> My kernel version is 6.12.0-rc3 from "make kernelversion".
>
> I think the errors are related to the bash type and version, rather than the kernel version.
> My bash version is: GNU bash, version 5.2.21(1)-release (x86_64-pc-linux-gnu)
>
> In fact, some shell do not complete expressions in variables and $var and command substitutions
> are done before the arithmetic expression itself is parsed.
> That expansion happens without regard for the arithmetic syntax, so with $var you can mess
> with that.
> So, I suggest to avoid to use $var inside a arithmetic expansion in order to be cross-platform.

Hello,
any thoughts about this patch?

Were you able to replicate the error?

> > >
> > >   tools/testing/selftests/intel_pstate/run.sh | 4 ++--
> > >   1 file changed, 2 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/tools/testing/selftests/intel_pstate/run.sh b/tools/testing/selftests/intel_pstate/run.sh
> > > index e7008f614ad7..0c1b6c1308a4 100755
> > > --- a/tools/testing/selftests/intel_pstate/run.sh
> > > +++ b/tools/testing/selftests/intel_pstate/run.sh
> > > @@ -87,9 +87,9 @@ mkt_freq=${_mkt_freq}0
> > >   # Get the ranges from cpupower
> > >   _min_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $1 } ')
> > > -min_freq=$(($_min_freq / 1000))
> > > +min_freq=$((_min_freq / 1000))
> > >   _max_freq=$(cpupower frequency-info -l | tail -1 | awk ' { print $2 } ')
> > > -max_freq=$(($_max_freq / 1000))
> > > +max_freq=$((_max_freq / 1000))
> > >   [ $EVALUATE_ONLY -eq 0 ] && for freq in `seq $max_freq -100 $min_freq`
> >
> > thanks,
> > -- Shuah
>
> Thanks,
> Alessandro

Feel free to indicate if I can provide something useful for your evaluation.

Thanks,
Alessandro