Re: [kbuild-all] Re: [PATCH 1/8] powerpc/mm: Make slice specific to book3s/64

Chen, Rong A
2021-11-26T05:20:28Z

On 11/24/2021 9:49 PM, Christophe Leroy wrote:
>
>
> Le 24/11/2021 à 13:10, Christophe Leroy a écrit :
>>
>>
>> Le 22/11/2021 à 15:48, kernel test robot a écrit :
>>> Hi Christophe,
>>>
>>> I love your patch! Perhaps something to improve:
>>>
>>> [auto build test WARNING on powerpc/next]
>>> [also build test WARNING on hnaz-mm/master linus/master v5.16-rc2
>>> next-20211118]
>>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>>> And when submitting patch, we suggest to use '--base' as documented in
>>> https://git-scm.com/docs/git-format-patch]
>>>
>>> url:
>>> https://github.com/0day-ci/linux/commits/Christophe-Leroy/Convert-powerpc-to-default-topdown-mmap-layout/20211122-165115
>>>
>>> base:
>>> https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
>>> config: powerpc64-randconfig-s031-20211122 (attached as .config)
>>> compiler: powerpc64-linux-gcc (GCC) 11.2.0
>>> reproduce:
>>>          wget
>>> https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross
>>> -O ~/bin/make.cross
>>>          chmod +x ~/bin/make.cross
>>>          # apt-get install sparse
>>>          # sparse version: v0.6.4-dirty
>>>          #
>>> https://github.com/0day-ci/linux/commit/1d0b7cc86d08f25f595b52d8c39ba9ca1d29a30a
>>>
>>>          git remote add linux-review https://github.com/0day-ci/linux
>>>          git fetch --no-tags linux-review
>>> Christophe-Leroy/Convert-powerpc-to-default-topdown-mmap-layout/20211122-165115
>>>
>>>          git checkout 1d0b7cc86d08f25f595b52d8c39ba9ca1d29a30a
>>>          # save the attached .config to linux build tree
>>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0
>>> make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
>>> ARCH=powerpc64
>>>
>>> If you fix the issue, kindly add following tag as appropriate
>>> Reported-by: kernel test robot <lkp@intel.com>
>>>
>>> All warnings (new ones prefixed by >>):
>>>
>>>     arch/powerpc/mm/book3s64/slice.c: In function
>>> 'slice_get_unmapped_area':
>>>>> arch/powerpc/mm/book3s64/slice.c:639:1: warning: the frame size of
>>>>> 1040 bytes is larger than 1024 bytes [-Wframe-larger-than=]
>>>       639 | }
>>>           | ^
>>
>>
>> The problem was already existing when slice.c was in arch/powerpc/mm/
>>
>> This patch doesn't introduce the problem.
>>
>
> In fact the problem is really added by yourself mister 'kernel test robot'.
>
> CONFIG_FRAME_WARN is supposed to be 2048 on 64 bit architectures.
>
> It the robot starts to reduce that value, it is on its own ....

Hi Christophe,

Thanks for the information, we'll set the default value for FRAME_WARN
in randconfig tests.

Best Regards,
Rong Chen

>
>
> config FRAME_WARN
>     int "Warn for stack frames larger than"
>     range 0 8192
>     default 2048 if GCC_PLUGIN_LATENT_ENTROPY
>     default 1536 if (!64BIT && (PARISC || XTENSA))
>     default 1024 if (!64BIT && !PARISC)
>     default 2048 if 64BIT
>     help
>       Tell gcc to warn at build time for stack frames larger than this.
>       Setting this too low will cause a lot of warnings.
>       Setting it to 0 disables the warning.
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