reproduce (this is a W=1 build):
        # https://github.com/zen-kernel/zen-kernel/commit/929363bec03b29a52d29a1e3b16e8b631ad47d18
        git remote add zen https://github.com/zen-kernel/zen-kernel
        git fetch --no-tags zen 6.19/prjc
        git checkout 929363bec03b29a52d29a1e3b16e8b631ad47d18

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