From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
Date: Sat, 24 Nov 2018 14:24:29 -0500

From: Willem de Bruijn <willemb@google.com>

Enable MSG_ZEROCOPY for udp sockets

Patch 1/2 is the main patch, a rebase from RFC patch
  http://patchwork.ozlabs.org/patch/899630/
  more details in the patch commit message

Patch 2/2 runs the already existing udp zerocopy tests
  as part of kselftest

See also recent Linux Plumbers presentation
  https://linuxplumbersconf.org/event/2/contributions/106/attachments/104/128/willemdebruijn-lpc2018-udpgso-presentation-20181113.pdf

Series looks good, just one coding style to fix up, I'll reply to patch #1.