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

From: Thomas Voegtle
Date: Wed Jan 10 2024 - 16:19:08 EST


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@xxxxxxxx>
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?