reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        git remote add mani-mhi https://git.kernel.org/pub/scm/linux/kernel/git/mani/mhi.git
        git fetch mani-mhi mhi-next
        git checkout mani-mhi/mhi-next
        b4 shazam https://lore.kernel.org/r/4d0fe1eab4b38fb85e2ec53c07289bc0843611a2.1752947108.git.ionic@ionic.de
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-8.5.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash net/qrtr/