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From: John Fastabend <john.fastabend@gmail.com>
Date: Mon, 5 Mar 2018 14:53:08 -0800

> I decided to make the default no-copy to mirror the existing
> sendpage() semantics and then to add the flag later. The flag
> support is not in this series simply because I wanted to get the
> base support in first.

What existing sendpage semantics are you referring to?