From 70da5b5c532f0ec8aa76b4f46158da5f010f34b3 Mon Sep 17 00:00:00 2001
From: Martin KaFai Lau <kafai@fb.com>
Date: Tue, 15 Sep 2015 14:30:09 -0700
Subject: [PATCH] ipv6: Replace spinlock with seqlock and rcu in ip6_tunnel

This patch uses a seqlock to ensure consistency between idst->dst and
idst->cookie.  It also makes dst freeing from fib tree to undergo a
rcu grace period.

Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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