reproduce (this is a W=1 build):
        git checkout e6b9dce0aeeb91dfc0974ab87f02454e24566182
        b4 shazam https://lore.kernel.org/r/20250923-loopback_mhi-v1-2-8618f31f44aa@oss.qualcomm.com
        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=$HOME/0day COMPILER=gcc-12.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash