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cdefs: Add __writeonly to mark write only vars
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Authored by andrew on Jun 11 2024, 11:15 AM.
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Summary

When a variable in write only and can't be removed, e.g. for API
reasons, it is useful to document this fact similar to diagused
and
witness_used.

Add __writeonly to tell the compiler and anyone looking at the code
that this variable is expected to only be written to, and to not
raise and error.

Sponsored by: Arm Ltd

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rG FreeBSD src repository
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