Following build warnings/ errors noticed while building linux next master branch with clang-13 for arm architecture with following configs. - footbridge_defconfig - mini2440_defconfig - s3c2410_defconfig
ERROR: modpost: __mulodi4 [drivers/block/nbd.ko] undefined! make[2]: *** [/builds/linux/scripts/Makefile.modpost:134: modules-only.symvers] Error 1 make[2]: *** Deleting file 'modules-only.symvers' make[2]: Target '__modpost' not remade because of errors. make[1]: *** [/builds/linux/Makefile:1952: modules] Error 2 make[1]: Target '__all' not remade because of errors. make: *** [Makefile:226: __sub-make] Error 2 make: Target '__all' not remade because of errors.
Build config: https://builds.tuxbuild.com/1xqOnCtgaWedE8U8jhmbI3FuAuJ/config
Reported-by: Linux Kernel Functional Testing lkft@linaro.org
meta data: ----------- git_describe: next-20210908 git_ref: git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next git_sha: 999569d59a0aa2509ae4a67ecc266c1134e37e7b git_short_log: 999569d59a0a (\Add linux-next specific files for 20210908) kconfig: [ mini2440_defconfig ], target_arch: arm toolchain: clang-13
steps to reproduce: https://builds.tuxbuild.com/1xqOnCtgaWedE8U8jhmbI3FuAuJ/tuxmake_reproducer.s...
-- Linaro LKFT https://lkft.linaro.org
Hi Naresh,
On Wed, Sep 08, 2021 at 04:58:11PM +0530, Naresh Kamboju wrote:
Following build warnings/ errors noticed while building linux next master branch with clang-13 for arm architecture with following configs.
- footbridge_defconfig
- mini2440_defconfig
- s3c2410_defconfig
ERROR: modpost: __mulodi4 [drivers/block/nbd.ko] undefined! make[2]: *** [/builds/linux/scripts/Makefile.modpost:134: modules-only.symvers] Error 1 make[2]: *** Deleting file 'modules-only.symvers' make[2]: Target '__modpost' not remade because of errors. make[1]: *** [/builds/linux/Makefile:1952: modules] Error 2 make[1]: Target '__all' not remade because of errors. make: *** [Makefile:226: __sub-make] Error 2 make: Target '__all' not remade because of errors.
Thanks for the report. This is a known issue that we have been tracking and it is now resolved in LLVM 14:
https://github.com/ClangBuiltLinux/linux/issues/1438
Nick said he should have a kernel patch to work around this in the kernel for older versions of LLVM soon.
By the way, can you use our new mailing list and my kernel.org address for future reports (llvm@lists.linux.devi, nathan@kernel.org)? It will make it easier to find these reports in the archives in the future and my filters will catch this better.
Cheers, Nathan
-
Naresh Kamboju -
Nathan Chancellor