reproduce (this is a W=1 build):
        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests
        # install um cross compiling tool for clang build
        # apt-get install binutils-um-linux-gnu
        # https://github.com/rgushchin/linux/commit/7fb104a83d94f08496291125374fdf7c49ea7baa
        git remote add rgushchin https://github.com/rgushchin/linux.git
        git fetch --no-tags rgushchin page_counters.1
        git checkout 7fb104a83d94f08496291125374fdf7c49ea7baa
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=um olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-17 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=um SHELL=/bin/bash arch/um/kernel/ fs/ kernel/ mm/ net/core/