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Date: Wed, 10 Jan 2024 22:18:54 +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 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?

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