reproduce (this is a W=1 build):
        git remote add awilliam-vfio https://github.com/awilliam/linux-vfio.git
        git fetch awilliam-vfio for-linus
        git checkout awilliam-vfio/for-linus
        b4 shazam https://lore.kernel.org/r/20260407180107.1603697-4-pbonzini@redhat.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 drivers/vfio/