reproduce (this is a W=1 build):
        # https://github.com/cilium/linux/commit/b1267b3c6afc658b47021929dc9ae44acef2c68f
        git remote add cilium https://github.com/cilium/linux.git
        git fetch --no-tags cilium pr/netkit-iouring2
        git checkout b1267b3c6afc658b47021929dc9ae44acef2c68f
        # 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 net/xdp/