linux-kernel - Re: Build error kernel/cgroup/rstat.c on v6.7-1959-gaffc5af36bbb

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Date: Thu, 11 Jan 2024 09:38:11 +0100 (CET)
From: Thomas Voegtle <tv@...96.de>
To: Arnd Bergmann <arnd@...db.de>
cc: linux-kernel@...r.kernel.org
Subject: Re: Build error kernel/cgroup/rstat.c on v6.7-1959-gaffc5af36bbb

On Thu, 11 Jan 2024, Arnd Bergmann wrote:

> On Wed, Jan 10, 2024, at 22:18, Thomas Voegtle wrote:
>> On Wed, 10 Jan 2024, Arnd Bergmann wrote:
>>
>>> On Wed, Jan 10, 2024, at 20:50, Thomas Voegtle wrote:
>>>> Hello,
>>>>
>>>> building v6.7-1959-gaffc5af36bbb I get this:
>>>>
>>>> ...
>>>>    CALL    scripts/checksyscalls.sh
>>>>    DESCEND objtool
>>>>    INSTALL libsubcmd_headers
>>>>    CC      kernel/cgroup/rstat.o
>>>> kernel/cgroup/rstat.c:218:22: error: no previous prototype for
>>>> ‘bpf_rstat_flush’ [-Werror=missing-prototypes]
>>>>   __weak noinline void bpf_rstat_flush(struct cgroup *cgrp,
>>>>                        ^~~~~~~~~~~~~~~
>>>>
>>>>
>>>> git bisects points to:
>>>>
>>>> commit 0fcb70851fbfea1776ae62f67c503fef8f0292b9 (refs/bisect/bad)
>>>> Author: Arnd Bergmann <arnd@...db.de>
>>>> Date:   Thu Nov 23 12:05:06 2023 +0100
>>>>
>>>>      Makefile.extrawarn: turn on missing-prototypes globally
>>>>
>>>>
>>>> My config is attached.
>>>> openSUSE Leap 15.5 x86_64 with gcc 7.5.0
>>>>
>>>>
>>>> Is this already known?
>>>
>>> There is a workaround in linux-next, see commit
>>> 15fb6f2b6c4c ("bpf: Add __bpf_hook_{start,end} macros")
>>>
>>> I assume this will be merged soon.
>>
>> That commit is already merged?
>
> It's probably missing this one then:
>
> 689b097a06ba ("compiler-gcc: Suppress -Wmissing-prototypes warning for all supported GCC")
>
>    Arnd
>

With that patch (689b097a06ba) it builds fine.

Thanks.


       Thomas