reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/ljs/linux.git/commit/?id=d91a1a12c5871a70ef97dc4725f0ca758f210524
        git remote add ljs https://git.kernel.org/pub/scm/linux/kernel/git/ljs/linux.git
        git fetch --no-tags ljs project/cow-context
        git checkout d91a1a12c5871a70ef97dc4725f0ca758f210524

        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=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash mm/