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