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To:     "Darrick J. Wong" <darrick.wong@oracle.com>
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Subject: Re: [PATCH 02/13] uapi: General notification ring definitions [ver #4]
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From:   David Howells <dhowells@redhat.com>
Date:   Fri, 07 Jun 2019 16:30:51 +0100
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> I'm starting by reading the uapi changes and the sample program...

If you look in:

  [PATCH 05/13] General notification queue with user mmap()'able ring buffer

you'll find the API document that goes in Documentation/

David