reproduce (this is a W=1 build):
        # https://github.com/projectacrn/acrn-kernel/commit/3cc37670a872d763017eb6d99a24be755d47df86
        git remote add acrn https://github.com/projectacrn/acrn-kernel
        git fetch --no-tags acrn 6.12/linux
        git checkout 3cc37670a872d763017eb6d99a24be755d47df86
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/