reproduce (this is a W=1 build):
        # https://github.com/amir73il/linux/commit/ff652575590b634a780d46e6500e88f4e162f7db
        git remote add amir73il https://github.com/amir73il/linux
        git fetch --no-tags amir73il vfs-6.19.ovl
        git checkout ff652575590b634a780d46e6500e88f4e162f7db

        # clang-22 might not be officially released. Try a lower version if installation fails.
        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=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-22 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash fs/nfs/ fs/overlayfs/