reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/tobetter/linux/commit/1933aeb9738c3ef10a62c3f9da64e4bd76afcf8c
        git remote add tobetter https://github.com/tobetter/linux
        git fetch --no-tags tobetter odroid-6.16.y
        git checkout 1933aeb9738c3ef10a62c3f9da64e4bd76afcf8c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash dtbs_check