reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/devsec/tsm.git/commit/?id=a2be27064cb1e7ccb165e331527d1123a4df0fc9
        git remote add devsec-tsm https://git.kernel.org/pub/scm/linux/kernel/git/devsec/tsm
        git fetch --no-tags devsec-tsm devsec-phase2
        git checkout a2be27064cb1e7ccb165e331527d1123a4df0fc9

        # install loongarch cross compiling tool for clang build
        # apt-get install binutils-loongarch-linux-gnu
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash drivers/pci/