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    SubjectRe: [PATCH v2 net-next 0/2] tcp: mmap: rework zerocopy receive
    On Wed, Apr 25, 2018 at 5:43 PM, Eric Dumazet <edumazet@google.com> wrote:
    > 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.
    >
    > v2:
    > Added a missing page align of zc->length in tcp_zerocopy_receive()
    > Properly clear zc->recv_skip_hint in case user request was completed.

    Acked-by: Soheil Hassas Yeganeh <soheil@google.com>

    Thank you Eric for the nice redesign!

    > 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 | 189 +++++++++++++------------
    > tools/testing/selftests/net/tcp_mmap.c | 63 +++++----
    > 3 files changed, 142 insertions(+), 118 deletions(-)
    >
    > --
    > 2.17.0.441.gb46fe60e1d-goog
    >

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