10:57 a.m.
On Thu, May 20, 2021 at 05:56:35PM +0800, Rong Chen wrote:
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
Hi Arnd, thanks for feedback, we have talked about this internally. We use
randconfig
to cover different combination, some randconfig would have CONFIG_COMPILE_TEST=y, some
is not. For now, we also want to check the kernel build status when COMPILE_TEST is
not set (as if this is a valid kconfig combination). Thus we may not always enforcing
the y here, but keep it as random as possible.
> > 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
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