Merge android-4.4.174 (62872f95) into msm-4.4

* refs/heads/tmp-62872f95
  Linux 4.4.174
  rcu: Force boolean subscript for expedited stall warnings
  net: ipv4: do not handle duplicate fragments as overlapping
  net: fix pskb_trim_rcsum_slow() with odd trim offset
  inet: frags: better deal with smp races
  ipv4: frags: precedence bug in ip_expire()
  ip: frags: fix crash in ip_do_fragment()
  ip: process in-order fragments efficiently
  ip: add helpers to process in-order fragments faster.
  ip: use rb trees for IP frag queue.
  net: pskb_trim_rcsum() and CHECKSUM_COMPLETE are friends
  ipv6: defrag: drop non-last frags smaller than min mtu
  net: modify skb_rbtree_purge to return the truesize of all purged skbs.
  ip: discard IPv4 datagrams with overlapping segments.
  inet: frags: fix ip6frag_low_thresh boundary
  inet: frags: get rid of ipfrag_skb_cb/FRAG_CB
  inet: frags: reorganize struct netns_frags
  rhashtable: reorganize struct rhashtable layout
  ipv6: frags: rewrite ip6_expire_frag_queue()
  inet: frags: do not clone skb in ip_expire()
  inet: frags: break the 2GB limit for frags storage
  inet: frags: remove inet_frag_maybe_warn_overflow()
  inet: frags: get rif of inet_frag_evicting()
  inet: frags: remove some helpers
  ipfrag: really prevent allocation on netns exit
  net: ieee802154: 6lowpan: fix frag reassembly
  inet: frags: use rhashtables for reassembly units
  rhashtable: add schedule points
  rhashtable: Add rhashtable_lookup()
  rhashtable: add rhashtable_lookup_get_insert_key()
  inet: frags: refactor lowpan_net_frag_init()
  inet: frags: refactor ipv6_frag_init()
  inet: frags: refactor ipfrag_init()
  inet: frags: add a pointer to struct netns_frags
  inet: frags: change inet_frags_init_net() return value

Change-Id: I1f6e2fd6f7960509fa52b726458c74c9fb070b5b
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>