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

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