The criterion for kernel inclusion isn't really whether it works, however.
It's whether other people would be able to understand it well enough to
support it if you disappear (or if somebody else has changes that require
changes to it). If it works well but isn't nice code, nobody really
benefits from having it in the kernel distribution rather than external
(like it's been for the past 8 years). If it is nice code (somewhat
regardless of whether it happens to work right now), people can work on it
and keep it in sync with the kernel as they change things.
-Daniel
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