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SubjectRe: [PATCH v2] include/uapi/linux/xfrm.h: Fix XFRM_MSG_MAPPING ABI breakage
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.

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