reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # install arm cross compiling tool for clang build
        # apt-get install binutils-arm-linux-gnueabi
        # https://github.com/krzk/linux/commit/d166a80235d6f2a8d5186c39d834e61920eacdb2
        git remote add krzk-github https://github.com/krzk/linux
        git fetch --no-tags krzk-github n/phy-exynos-usbdrd-fix
        git checkout d166a80235d6f2a8d5186c39d834e61920eacdb2
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-21 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-21 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash