reproduce (this is a W=1 build):
        git checkout 407aa63018d15c35a34938633868e61174d2ef6e
        b4 shazam https://lore.kernel.org/r/20251010-fix-unmap-v3-3-306c724d6998@fb.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 olddefconfig
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/vfio/