reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/superm1/linux.git/commit/?id=e4d449a5f359fa7af06a7984f5e31875f8bee9dc
        git remote add superm1 https://git.kernel.org/pub/scm/linux/kernel/git/superm1/linux.git
        git fetch --no-tags superm1 superm1/backlight-property
        git checkout e4d449a5f359fa7af06a7984f5e31875f8bee9dc

        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=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-15.1.0 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=arc SHELL=/bin/bash