reproduce (this is a W=1 build):
        git remote add rust https://github.com/Rust-for-Linux/linux
        git fetch rust rust-next
        git checkout rust/rust-next
        b4 shazam https://lore.kernel.org/r/SpXhwnZO__ST8sHQ3HQ3ygThOcnmn0x2JlJ_nwJglL87vw5XfQA8sDH6HdkrGgFVycLhPBlCc6-UtEImTvY26A==@protonmail.internalid
        # 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