ipv4: use seqlock for nh_exceptions

Use global seqlock for the nh_exceptions. Call
fnhe_oldest with the right hash chain. Correct the diff
value for dst_set_expires.

v2: after suggestions from Eric Dumazet:
* get rid of spin lock fnhe_lock, rearrange update_or_create_fnhe
* continue daddr search in rt_bind_exception

v3:
* remove the daddr check before seqlock in rt_bind_exception
* restart lookup in rt_bind_exception on detected seqlock change,
as suggested by David Miller

Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/net/ip_fib.h b/include/net/ip_fib.h
index e9ee1ca07087..2daf096dfc60 100644
--- a/include/net/ip_fib.h
+++ b/include/net/ip_fib.h
@@ -51,7 +51,7 @@ struct fib_nh_exception {
         struct fib_nh_exception __rcu   *fnhe_next;
         __be32                          fnhe_daddr;
         u32                             fnhe_pmtu;
-        u32                             fnhe_gw;
+        __be32                          fnhe_gw;
         unsigned long                   fnhe_expires;
         unsigned long                   fnhe_stamp;
 };