On Mon, Nov 16, 2015 at 03:22:06PM -0500, Alan Stern wrote:
>       Check that userspace requested zerocopy (otherwise the user 
>       program might try to access other data stored in the same cache 
>       lines as the buffer while the I/O is in progres);

Needed for send only, right? For receive, I guess you're not allowed to
modify the buffer while the transfer is going on anyway.

/* Steinar */
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