Hi Benjamin, First bad commit (maybe != root cause): tree: https://github.com/frank-w/BPI-R2-4.14 5.15-bpi-r2-pro-drm head: 671b538f2b304cf24dbbbe25615bef2e86fef84d commit: 671b538f2b304cf24dbbbe25615bef2e86fef84d [81/81] drm: forward port of VOP2 driver config: mips-buildonly-randconfig-r001-20211014 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project acb3b187c4c88650a6a717a1bcb234d27d0d7f54) 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://github.com/frank-w/BPI-R2-4.14/commit/671b538f2b304cf24dbbbe25615... git remote add frank-w-bpi-r2-4.14 https://github.com/frank-w/BPI-R2-4.14 git fetch --no-tags frank-w-bpi-r2-4.14 5.15-bpi-r2-pro-drm git checkout 671b538f2b304cf24dbbbe25615bef2e86fef84d # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=mips 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/drm/rockchip/ebc-dev/Makefile'. make[5]: *** [scripts/Makefile.clean:68: drivers/gpu/drm/rockchip/ebc-dev] Error 2 make[6]: Failed to remake makefile 'drivers/gpu/drm/rockchip/rk618/Makefile'. make[5]: *** [scripts/Makefile.clean:68: drivers/gpu/drm/rockchip/rk618] Error 2 make[6]: Failed to remake makefile 'drivers/gpu/drm/rockchip/rk628/Makefile'. make[5]: *** [scripts/Makefile.clean:68: drivers/gpu/drm/rockchip/rk628] Error 2 make[5]: Target '__clean' not remade because of errors. make[4]: *** [scripts/Makefile.clean:68: drivers/gpu/drm/rockchip] Error 2 make[4]: Target '__clean' not remade because of errors. make[3]: *** [scripts/Makefile.clean:68: drivers/gpu/drm] 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