[NET]: Can use __get_cpu_var() instead of per_cpu() in loopback driver.
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>
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 93fbea1..82c10de 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -153,14 +153,14 @@
#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;