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Date:   Tue, 28 Jun 2022 13:06:26 -0400
From:   Liam Beguin <liambeguin@gmail.com>
To:     Geert Uytterhoeven <geert@linux-m68k.org>
Cc:     Peter Rosin <peda@axentia.se>, Jonathan Cameron <jic23@kernel.org>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Lars-Peter Clausen <lars@metafoo.de>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-iio@vger.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>, Rob Herring <robh+dt@kernel.org>
Subject: Re: [PATCH v15 06/10] iio: test: add basic tests for the iio-rescale
 driver
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References: <20220213025739.2561834-1-liambeguin@gmail.com>
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 <CAMuHMdVMhLRS+XuX_8O5UPHzoOp6a6XpTvysQS+nT+GLkL7gjQ@mail.gmail.com>
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Hi Geert,

On Mon, Jun 27, 2022 at 09:22:29AM +0200, Geert Uytterhoeven wrote:
> Hi Liam,
> 
> On Mon, Feb 14, 2022 at 12:00 AM Liam Beguin <liambeguin@gmail.com> wrote:
> > The iio-rescale driver supports various combinations of scale types and
> > offsets. These can often result in large integer multiplications. Make
> > sure these calculations are done right by adding a set of kunit test
> > cases that build on top of iio-test-format.
> >
> > To run these tests, add the following to .kunitconfig
> >         $ cat .kunitconfig
> >         CONFIG_IIO=y
> >         CONFIG_IIO_RESCALE_KUNIT_TEST=y
> >         CONFIG_KUNIT=y
> >
> > Then run:
> >         $ ./tools/testing/kunit/kunit.py run --kunitconfig .kunitconfig
> >
> > Signed-off-by: Liam Beguin <liambeguin@gmail.com>
> > Reviewed-by: Peter Rosin <peda@axentia.se>
> 
> Thanks for your patch, which is now commit 8e74a48d17d509bf
> ("iio: test: add basic tests for the iio-rescale driver") in v5.18.

Thanks!  I also recently sent a fix for this which recently made it
upstream:
7a2f6f61e8ee ("iio: test: fix missing MODULE_LICENSE for IIO_RESCALE=m")

> > --- a/drivers/iio/test/Kconfig
> > +++ b/drivers/iio/test/Kconfig
> > @@ -4,6 +4,16 @@
> >  #
> >
> >  # Keep in alphabetical order
> > +config IIO_RESCALE_KUNIT_TEST
> > +       bool "Test IIO rescale conversion functions"
> 
> Is there any reason this cannot be tristate, so I can always enable
> this as a module, and run the test by loading the module whenever
> I want?

I based this patch off of IIO_TEST_FORMAT, and also thought that Kunit
tests had to be built-in to work with tools/testing/kunit/kunit.py

Looking at the Documentation again, it seems I was (partially?) wrong,
kunit tests can be run as module, but manually.

I could give this a try and send a patch in the next few days.

Cheers,
Liam

> > +       depends on KUNIT && !IIO_RESCALE
> > +       default KUNIT_ALL_TESTS
> > +       help
> > +         If you want to run tests on the iio-rescale code say Y here.
> > +
> > +         This takes advantage of ARCH=um to run tests and should be used by
> > +         developers to tests their changes to the rescaling logic.
> > +
> >  config IIO_TEST_FORMAT
> >          bool "Test IIO formatting functions"
> >          depends on KUNIT=y
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds