reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # https://github.com/shenki/linux/commit/12af9e35efffa226dc9ced8d18b00a6c88d1c1d2
        git remote add shenki https://github.com/shenki/linux
        git fetch --no-tags shenki aspeed-6.9-rebase
        git checkout 12af9e35efffa226dc9ced8d18b00a6c88d1c1d2
        # 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/gpu/drm/ast/