reproduce (this is a W=1 build):
        # https://github.com/thesofproject/linux/commit/15c6ca6066957e936d2afd6a996dc40e0c0a825a
        git remote add thesofproject https://github.com/thesofproject/linux
        git fetch --no-tags thesofproject topic/sof-dev-rebase
        git checkout 15c6ca6066957e936d2afd6a996dc40e0c0a825a

        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=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=csky olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=csky SHELL=/bin/bash