commit 2d7ceece08ad940d0ceac98ab1b5a3b82dfc2a0a
author Eric Dumazet <dada1@cosmosbay.com> Tue Sep 27 15:22:58 2005 -0700
committer David S. Miller <davem@davemloft.net> Tue Sep 27 15:22:58 2005 -0700
tree 7b439a9d765c2cb63f33deddda649014957bfc00
parent bc8dfcb93970ad7139c976356bfc99d7e251deaf

[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

diff --git a/net/core/dev.c b/net/core/dev.c
index 37c8810..9066c87 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1259,6 +1259,8 @@
 	      	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. 
 	 */