reproduce (this is a W=1 build):
        mkdir -p ~/bin
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/qais-yousef/linux/commit/029b407f286d7bc9a7ace79c65483efa8ead8671
        git remote add qais-yousef https://github.com/qais-yousef/linux
        git fetch --no-tags qais-yousef sched-setscheduler-hide
        git checkout 029b407f286d7bc9a7ace79c65483efa8ead8671
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash