[PATCH net-next 0/2] tcp: mmap: rework zerocopy receive

syzbot reported a lockdep issue caused by tcp mmap() support.

I implemented Andy Lutomirski nice suggestions to resolve the
issue and increase scalability as well.

First patch is adding a new setsockopt() operation and changes mmap()
behavior.

Second patch changes tcp_mmap reference program.

Eric Dumazet (2):
  tcp: add TCP_ZEROCOPY_RECEIVE support for zerocopy receive
  selftests: net: tcp_mmap must use TCP_ZEROCOPY_RECEIVE

 include/uapi/linux/tcp.h               |   8 ++
 net/ipv4/tcp.c                         | 186 +++++++++++++------------
 tools/testing/selftests/net/tcp_mmap.c |  63 +++++----
 3 files changed, 139 insertions(+), 118 deletions(-)

-- 
2.17.0.484.g0c8726318c-goog