reproduce (this is a W=1 build):
        git checkout a0ae2a256046c0c5d3778d1a194ff2e171f16e5f
        b4 shazam https://lore.kernel.org/r/20260307-sahara_protocol_new_v2-v2-4-29dc748b5e9c@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=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.2.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash drivers/bus/mhi/sahara/