reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/projectacrn/acrn-kernel/commit/f528146c92c545c17a21206b87e70c7087247f88
        git remote add acrn https://github.com/projectacrn/acrn-kernel
        git fetch --no-tags acrn acrn_6.1.80
        git checkout f528146c92c545c17a21206b87e70c7087247f88
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-18 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash drivers/virt/acrn/