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udp: use atomic_inc_not_zero_hint
authorEric Dumazet <eric.dumazet@gmail.com>
Mon, 15 Nov 2010 19:58:26 +0000 (19:58 +0000)
committerDavid S. Miller <davem@davemloft.net>
Tue, 16 Nov 2010 19:17:43 +0000 (11:17 -0800)
UDP sockets refcount is usually 2, unless an incoming frame is going to
be queued in receive or backlog queue.

Using atomic_inc_not_zero_hint() permits to reduce latency, because
processor issues less memory transactions.

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

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