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Nathaniel Wesley Filardo authored
When this flag is set, operations that update an existing kevent will not change the udata field. This can be used to NOTE_TRIGGER or EV_{EN,DIS}ABLE events without overwriting the stashed pointer. Reviewed by: Domagoj Stolfa <domagoj.stolfa@gmail.com> Obtained from: CheriBSD Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D30286
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