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

From: Rong Chen
Date: Thu May 20 2021 - 05:24:58 EST

On 5/19/21 8:32 PM, Arnd Bergmann wrote:
On Mon, May 17, 2021 at 3:45 PM Vincent Guittot
<vincent.guittot@xxxxxxxxxx> wrote:
On Tue, 11 May 2021 at 18:01, kernel test robot <lkp@xxxxxxxxx> wrote:
tree: 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 ( a0fed635fe1701470062495a6ffee1c608f3f1bc)
reproduce (this is a W=1 build):
wget -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install mips cross compiling tool for clang build
# apt-get install binutils-mips-linux-gnu
git remote add linus
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:


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.

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