reproduce (this is a W=1 build):
        git remote add drm-i915 https://gitlab.freedesktop.org/drm/i915/kernel.git
        git fetch drm-i915 for-linux-next
        git checkout drm-i915/for-linux-next
        b4 shazam https://lore.kernel.org/r/523081095c7da23ce03835687fe6c5cb4ed3c77f.1768575249.git.jani.nikula@intel.com

        # 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