reproduce (this is a W=1 build):
        git remote add ah-configfs https://git.kernel.org/pub/scm/linux/kernel/git/a.hindborg/configfs.git
        git fetch ah-configfs configfs-next
        git checkout ah-configfs/configfs-next
        b4 shazam https://lore.kernel.org/r/f515b62bb05e7b6bf0bb06c8fdb362486fea25a8.1789420324.git.pgovind2@uci.edu

        # install loongarch cross compiling tool for clang build
        # apt-get install binutils-loongarch-linux-gnu
        # clang-24 might not be officially released. Try a lower version if installation fails.
        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=$HOME/0day COMPILER=clang-24 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-24 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash