[PATCH net-next 0/4] mm,tcp: provide mmap_hook to solve lockdep issue

This patch series provide a new mmap_hook to fs willing to grab
a mutex before mm->mmap_sem is taken, to ensure lockdep sanity.

This hook allows us to shorten tcp_mmap() execution time (while mmap_sem
is held), and improve multi-threading scalability. 

Eric Dumazet (4):
  mm: provide a mmap_hook infrastructure
  net: implement sock_mmap_hook()
  tcp: provide tcp_mmap_hook()
  tcp: mmap: move the skb cleanup to tcp_mmap_hook()

 include/linux/fs.h  |  6 ++++++
 include/linux/net.h |  1 +
 include/net/tcp.h   |  1 +
 mm/util.c           | 19 ++++++++++++++++++-
 net/ipv4/af_inet.c  |  1 +
 net/ipv4/tcp.c      | 39 ++++++++++++++++++++++++++++++---------
 net/ipv6/af_inet6.c |  1 +
 net/socket.c        |  9 +++++++++
 8 files changed, 67 insertions(+), 10 deletions(-)

-- 
2.17.0.484.g0c8726318c-goog