Hi Fei, First bad commit (maybe != root cause): tree: https://chromium.googlesource.com/chromiumos/third_party/kernel chromeos-5.15 head: b4c97de985b1ab07e191bd42d850e521b38ff00b commit: 47053c9ca1fca9a873ad8981b4e7115d40ed9d03 [1859/2051] CHROMIUM: Mali: Build Mali Bifrost config: powerpc64-randconfig-r012-20211214 (https://download.01.org/0day-ci/archive/20211215/202112151507.MmMFkgk1-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dd245bab9fbb364faa1581e4f92ba3119a872fba) 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 powerpc64 cross compiling tool for clang build # apt-get install binutils-powerpc64-linux-gnu git remote add chrome-os https://chromium.googlesource.com/chromiumos/third_party/kernel git fetch --no-tags chrome-os chromeos-5.15 git checkout 47053c9ca1fca9a873ad8981b4e7115d40ed9d03 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=powerpc distclean If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): make[6]: Failed to remake makefile 'drivers/gpu/arm/bifrost/arbitration/Makefile'. make[5]: *** [scripts/Makefile.clean:68: drivers/gpu/arm/bifrost/arbitration] Error 2 make[5]: Target '__clean' not remade because of errors. make[4]: *** [scripts/Makefile.clean:68: drivers/gpu/arm/bifrost] Error 2 make[4]: Target '__clean' not remade because of errors. make[3]: *** [scripts/Makefile.clean:68: drivers/gpu/arm] Error 2 make[3]: Target '__clean' not remade because of errors. make[2]: *** [scripts/Makefile.clean:68: drivers/gpu] Error 2 make[2]: Target '__clean' not remade because of errors. make[1]: *** [Makefile:1875: _clean_drivers] Error 2 make[1]: Target 'distclean' not remade because of errors. make: *** [Makefile:219: __sub-make] Error 2 make: Target 'distclean' not remade because of errors. vim +15 scripts/Makefile.clean 2315c6e4227815 Sam Ravnborg 2005-07-25 12 2a691470345a00 Sam Ravnborg 2005-07-25 13 # The filename Kbuild has precedence over Makefile db8c1a7b2ca25f Sam Ravnborg 2005-07-27 14 kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src)) db8c1a7b2ca25f Sam Ravnborg 2005-07-27 @15 include $(if $(wildcard $(kbuild-dir)/Kbuild), $(kbuild-dir)/Kbuild, $(kbuild-dir)/Makefile) ^1da177e4c3f41 Linus Torvalds 2005-04-16 16 :::::: The code at line 15 was first introduced by commit :::::: db8c1a7b2ca25f37b1429c00e82d6568f86caec1 kbuild: fix building external modules :::::: TO: Sam Ravnborg <sam(a)mars.(none)&gt; :::::: CC: Sam Ravnborg <sam(a)mars.(none)&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org