7:56 p.m.
On 5/20/21 5:27 PM, Arnd Bergmann wrote:
On Thu, May 20, 2021 at 11:22 AM Rong Chen
<rong.a.chen(a)intel.com> wrote:
> On 5/20/21 4:28 AM, Arnd Bergmann wrote:
>> On Wed, May 19, 2021 at 9:48 PM kernel test robot <lkp(a)intel.com> wrote:
>>> tree:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-5.10.y
>>> head: 689e89aee55c565fe90fcdf8a7e53f2f976c5946
>>> commit: 5f2f616343b1d62d26f24316fbfc107ecf0983a9 [3189/5262]
linux/compiler-clang.h: define HAVE_BUILTIN_BSWAP*
>>> config: mips-randconfig-r015-20210519 (attached as .config)
>>> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project
8e93d10633d751a3e9169bf9fa68326925ffa097)
>>> 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/stable/linux-stable-rc.gi...
>>> git remote add linux-stable-rc
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git
>>> git fetch --no-tags linux-stable-rc linux-5.10.y
>>> git checkout 5f2f616343b1d62d26f24316fbfc107ecf0983a9
>>> # save the attached .config to linux build tree
>>> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross
ARCH=mips
>>>
>>> If you fix the issue, kindly add following tag as appropriate
>>> Reported-by: kernel test robot <lkp(a)intel.com>
>>>
>>> All warnings (new ones prefixed by >>):
>>>
>> I analyzed another bug like this today, and I think this is again just
>> CONFIG_UBSAN_ALIGNMENT=y
>> on mips/clang causing tons of these warnings.
>>
>> I don't think this should be considered a regression, but we may want
>> to change either the
>> kernel or the 0day bot from test building this combination of options.
>>
>> Arnd
>>
> Hi Arnd,
>
> We have disabled CONFIG_UBSAN_ALIGNMENT for mips/clang in our kconfigs
> to avoid reporting such warnings again.
Thanks a lot, that helps.
Have you considered always enforcing CONFIG_COMPILE_TEST=y for any
randconfig build? That would address this issue along with a number of similar
ones. I have sent a number of patches to add COMPILE_TEST dependencies
for things that otherwise break in randconfig builds but could still be useful
in more specific cases when users know better.
Arnd
Hi Arnd,
Thanks for the advice, we'll consider it in the near future
after assessing the existing configures.
Best Regards,
Rong Chen