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@xxxxxxxxx> wrote: > > > On 5/20/21 4:28 AM, Arnd Bergmann wrote: > > > > On Wed, May 19, 2021 at 9:48 PM kernel test robot <lkp@xxxxxxxxx> 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.git/commit/?id=5f2f616343b1d62d26f24316fbfc107ecf0983a9 > > > > > 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@xxxxxxxxx> > > > > > > > > > > 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 > _______________________________________________ > kbuild-all mailing list -- kbuild-all@xxxxxxxxxxxx > To unsubscribe send an email to kbuild-all-leave@xxxxxxxxxxxx
