reproduce (this is a W=1 build):
        git checkout e6ea10d5dbe082c54add289b44f08c9fcfe658af
        b4 shazam https://lore.kernel.org/r/20250327211302.286313-1-ojeda@kernel.org
        # 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 rustfmtcheck