linux-kernel - Re: kernel/sched/fair.c:9551:12: warning: stack frame size of 1376 bytes in function 'load

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Message-ID: <CAK8P3a0YVh=hoBthjH7N=mSXOi0fEdwvyuHUJ36qricqVUZ9jA@mail.gmail.com>
Date:   Wed, 19 May 2021 14:32:34 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     kernel test robot <lkp@...el.com>, kbuild-all@...ts.01.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Valentin Schneider <valentin.schneider@....com>
Subject: Re: kernel/sched/fair.c:9551:12: warning: stack frame size of 1376
 bytes in function 'load_balance'

On Mon, May 17, 2021 at 3:45 PM Vincent Guittot
<vincent.guittot@...aro.org> wrote:
>
> On Tue, 11 May 2021 at 18:01, kernel test robot <lkp@...el.com> wrote:
> >
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   1140ab592e2ebf8153d2b322604031a8868ce7a5
> > commit: 0826530de3cbdc89e60a89e86def94a5f0fc81ca sched/fair: Remove update of blocked load from newidle_balance
> > date:   9 weeks ago
> > config: mips-randconfig-r022-20210511 (attached as .config)
> > compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project a0fed635fe1701470062495a6ffee1c608f3f1bc)
> > reproduce (this is a W=1 build):
> >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> >         chmod +x ~/bin/make.cross
> >         # install mips cross compiling tool for clang build
> >         # apt-get install binutils-mips-linux-gnu
> >         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0826530de3cbdc89e60a89e86def94a5f0fc81ca
> >         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> >         git fetch --no-tags linus master
> >         git checkout 0826530de3cbdc89e60a89e86def94a5f0fc81ca
> >         # save the attached .config to linux build tree
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips
>
> It was a bit difficult to find the warning among the thousand

I opened an issue against clang about it:

See https://github.com/ClangBuiltLinux/linux/issues/1379

but then found that this is already known. I think it would be best to
make the kernel test robot
set CONFIG_COMPILE_TEST to avoid issues like this. I have annotated a
number of symbols
that are known to cause unnecessary false positives in a similar way
to get a clean build.

        Arnd