tree cda6089e75f98fc3c9812993cf790fccac98b67a
parent 546add79468183f266c75c632c96e4b0029e0d96
author Eric Dumazet <eric.dumazet@gmail.com> 1286412561 -0700
committer David S. Miller <davem@davemloft.net> 1286413293 -0700

neigh: RCU conversion of struct neighbour

This is the second step for neighbour RCU conversion.

(first was commit d6bf7817 : RCU conversion of neigh hash table)

neigh_lookup() becomes lockless, but still take a reference on found
neighbour. (no more read_lock()/read_unlock() on tbl->lock)

struct neighbour gets an additional rcu_head field and is freed after an
RCU grace period.

Future work would need to eventually not take a reference on neighbour
for temporary dst (DST_NOCACHE), but this would need dst->_neighbour to
use a noref bit like we did for skb->_dst.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>