netdev - [PATCH v4 RFC 3/8] ipv4: Set DST_NOCACHE in rt_dst

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Message-Id: <20110312.163628.241930412.davem@davemloft.net>
Date:	Sat, 12 Mar 2011 16:36:28 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	netdev@...r.kernel.org
Subject: [PATCH v4 RFC 3/8] ipv4: Set DST_NOCACHE in rt_dst_alloc().


Instead of using a read/modify/write in rt_finalize().

Signed-off-by: David S. Miller <davem@...emloft.net>
---
 net/ipv4/route.c |   11 +++++------
 1 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 7e8720f..6036476 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -492,11 +492,6 @@ void rt_cache_flush(struct net *net, int delay)
 
 static struct rtable *rt_finalize(struct rtable *rt, struct sk_buff *skb)
 {
-	/* To avoid expensive rcu stuff for this uncached dst, we set
-	 * DST_NOCACHE so that dst_release() can free dst without
-	 * waiting a grace period.
-	 */
-	rt->dst.flags |= DST_NOCACHE;
 	if (rt->rt_type == RTN_UNICAST || rt_is_output_route(rt)) {
 		int err = arp_bind_neighbour(&rt->dst);
 		if (err) {
@@ -1114,7 +1109,11 @@ static struct rtable *rt_dst_alloc(bool nopolicy, bool noxfrm)
 	if (rt) {
 		rt->dst.obsolete = -1;
 
-		rt->dst.flags = DST_HOST |
+		/* To avoid expensive rcu stuff for this uncached dst, we set
+		 * DST_NOCACHE so that dst_release() can free dst without
+		 * waiting a grace period.
+		 */
+		rt->dst.flags = DST_NOCACHE | DST_HOST |
 			(nopolicy ? DST_NOPOLICY : 0) |
 			(noxfrm ? DST_NOXFRM : 0);
 	}
-- 
1.7.4.1

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