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

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Message-ID: <3b7ec693-f4a5-e1aa-3e07-b22a4008d4c9@infradead.org>
Date:   Thu, 26 May 2022 13:04:41 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Liam Beguin <liambeguin@...il.com>
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



On 5/26/22 09:04, Liam Beguin wrote:
> 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.
> 

Liam,

I'll wait until next week to see if you come up with anything.

Thanks.

> 
>>
>> 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

-- 
~Randy