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

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Date:   Thu, 20 May 2021 17:23:34 +0800
From:   Rong Chen <rong.a.chen@...el.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        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: [kbuild-all] Re: kernel/sched/fair.c:9551:12: warning: stack
 frame size of 1376 bytes in function 'load_balance'



On 5/19/21 8:32 PM, Arnd Bergmann wrote:
> 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

Hi Arnd,

We have disabled CONFIG_UBSAN_ALIGNMENT for mips/clang in our kconfigs
according to the comments in the above link.

Best Regards,
Rong Chen

>
> 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
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