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

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Date:   Fri, 20 May 2022 20:17:18 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>
Cc:     "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



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.
> 

-- 
~Randy