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

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Date:   Thu, 26 May 2022 08:36:34 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Liam Beguin <liambeguin@...il.com>
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

Liam:

Any comment on this?
Otherwise I'll just send a formal patch like this (below).

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