linux-kernel - Re: kbuild problem: ERROR: modpost: missing MODULE_LICENSE() in drivers/iio/afe/iio-rescale.o

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Message-ID: <Yo+lHSmeIsx144cv@shaak>
Date:   Thu, 26 May 2022 12:04:45 -0400
From:   Liam Beguin <liambeguin@...il.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-iio@...r.kernel.org, Peter Rosin <peda@...ntia.se>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        KUnit Development <kunit-dev@...glegroups.com>
Subject: Re: kbuild problem: ERROR: modpost: missing MODULE_LICENSE() in
 drivers/iio/afe/iio-rescale.o

Hi Randy,

On Thu, May 26, 2022 at 08:36:34AM -0700, Randy Dunlap wrote:
> Liam:
> 
> Any comment on this?
> Otherwise I'll just send a formal patch like this (below).

Apologies for not answering earlier.

I wanted to look more into Masahiro's comment and try to fix the
Makefile, but that can be done after.

IMO your patch improves the current Kconfig, so I'd recommend sending
the patch. If it can wait a bit, I can look at the Makefile over the
weekend.

Cheers,
Liam

> 
> Thanks.
> 
> On 5/20/22 20:51, Randy Dunlap wrote:
> > Ok, one more.
> > [also adding Liam here]
> > 
> > On 5/20/22 20:17, Randy Dunlap wrote:
> >>
> >>
> >> On 5/20/22 20:08, Randy Dunlap wrote:
> >>>
> >>>
> >>> On 5/20/22 19:40, Randy Dunlap wrote:
> >>>> Hi,
> >>>>
> >>>> In March I reported that a randconfig build complained:
> >>>>
> >>>> ERROR: modpost: missing MODULE_LICENSE() in drivers/iio/afe/iio-rescale.o
> >>>>
> >>>> (https://lore.kernel.org/all/16509fb6-e40c-e31b-2c80-264c44b0beb9@infradead.org/)
> >>>>
> >>>> I am still seeing this problem so I tried to dig into it a bit.
> >>>> However, I don't see why get_next_modinfo() and friends don't find the
> >>>> MODULE_LICENSE() since it is in the iio-rescale.o file.
> >>>>
> >>>> (BTW, I see this build error on many different $ARCH [around 15 tested]
> >>>> and with 2 different versions of GCC.)
> >>>>
> >>>> Q1: Is modpost checking both vmlinux and iio-rescale.o for modinfo license
> >>>> strings?
> >>>>
> >>>> It looks like it is, because it appears (?) that modpost is looking at
> >>>> drivers/iio/test/iio-test-rescale.o (<<<<< a kunit test, which is builtin
> >>>> in my .config) and at drivers/iio/afe/iio-rescale.o (which is built as a
> >>>> loadable module).
> >>>>
> >>>> Is this confusing modpost?
> >>>> I renamed drivers/iio/afe/iio-rescale.c to afe-rescale.c and changed its
> >>>> Makefile entry accordingly and the MODULE_LICENSE error goes away.
> >>>
> >>> Oh well. This rename causes drivers/iio/test/iio-test-rescale.c to have
> >>> build errors, so that's not a solution, just some info...
> >>
> >> and that was due to not updating drivers/iio/test/Makefile.
> >> When that is done, the missing MODULE_LICENSE() is back in afe-rescale.o.
> >>
> >>>
> >>>> Is this a modpost error or is kunit messing things up?
> >>>>
> >>>> thanks for looking.
> > 
> > Does this look OK? It allows afe/iio-rescale.o to build XOR
> > test/iio-rescale.o (not both of them).
> > 
> > --- a/drivers/iio/test/Kconfig
> > +++ b/drivers/iio/test/Kconfig
> > @@ -6,7 +6,7 @@
> >  # Keep in alphabetical order
> >  config IIO_RESCALE_KUNIT_TEST
> >         bool "Test IIO rescale conversion functions"
> > -       depends on KUNIT=y && !IIO_RESCALE
> > +       depends on KUNIT=y && IIO_RESCALE=n
> >         default KUNIT_ALL_TESTS
> >         help
> >           If you want to run tests on the iio-rescale code say Y here.
> > 
> > 
> 
> -- 
> ~Randy