reproduce (this is a W=1 build):
        # https://github.com/tobetter/linux/commit/da67b773b1fcd150b4fce3af576ca96813cbf334
        git remote add tobetter https://github.com/tobetter/linux
        git fetch --no-tags tobetter odroid-5.15.y
        git checkout da67b773b1fcd150b4fce3af576ca96813cbf334
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=um olddefconfig
        make W=1 O=build_dir ARCH=um SHELL=/bin/bash