From 2d7ceece08ad940d0ceac98ab1b5a3b82dfc2a0a Mon Sep 17 00:00:00 2001
From: Eric Dumazet <dada1@cosmosbay.com>
Date: Tue, 27 Sep 2005 15:22:58 -0700
Subject: [PATCH] [NET]: Prefetch dev->qdisc_lock in dev_queue_xmit()

We know the lock is going to be taken.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 net/core/dev.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/core/dev.c b/net/core/dev.c
index 37c881070963..9066c874e273 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1259,6 +1259,8 @@ int dev_queue_xmit(struct sk_buff *skb)
 	      	if (skb_checksum_help(skb, 0))
 	      		goto out_kfree_skb;
 
+	spin_lock_prefetch(&dev->queue_lock);
+
 	/* Disable soft irqs for various locks below. Also 
 	 * stops preemption for RCU. 
 	 */
-- 
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