reproduce (this is a W=1 build):
        git checkout dc35ddcf97e99b18559d0855071030e664aae44d
        b4 shazam https://lore.kernel.org/r/20250623-io_pgtable-v2-1-fd72daac75f1@collabora.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash CLIPPY=1 rustdoc