reproduce (this is a W=1 build):
        git checkout 87d6aab2389e5ce0197d8257d5f8ee965a67c4cd
        b4 shazam https://lore.kernel.org/r/20241010035048.3422527-3-maobibo@loongson.cn
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash mm/