On Mon, Sep 13, 2021 at 09:16:39AM +0200, Ondrej Mosnacek wrote: > Perhaps it would be a good idea to put a comment here to make it less > likely that this repeats in the future. Something like: > > /* IMPORTANT: Only insert new entries right above this line, otherwise > you break ABI! */ Well, this statement is true for (almost) every UAPI-exposed enum, and netlink is vast and relies on enums heavily. I think it is already mentioned somewhere in the documentation, and in the end it falls on the shoulders of the maintainers—to pay additional attention to UAPI changes.