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[NET]: Can use __get_cpu_var() instead of per_cpu() in loopback driver.

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As BHs are off in loopback_xmit(), preemption cannot occurs, so we can
use __get_cpu_var() instead of per_cpu() (and avoid a
preempt_enable()/preempt_disable() pair)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2006-10-20 00:32:41 -07:00 • committed by David S. Miller
parent 78d7942317
commit 58f539740b
1 changed files with 3 additions and 3 deletions
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6
drivers/net/loopback.c
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@ -153,14 +153,14 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
#endif
dev->last_rx = jiffies;
lb_stats = &per_cpu(pcpu_lstats, get_cpu());
/* it's OK to use __get_cpu_var() because BHs are off */
lb_stats = &__get_cpu_var(pcpu_lstats);
lb_stats->bytes += skb->len;
lb_stats->packets++;
put_cpu();
netif_rx(skb);
return(0);
return 0;
}
static struct net_device_stats loopback_stats;