[NET]: Bring comments in loopback.c uptodate.
A hint as to why it is safe to use per cpu variables, and note that we actually can have multiple instances of the loopback device now. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
fe242cfd33
commit
9e0db4b12c
|
@ -154,6 +154,7 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev)
|
||||||
#endif
|
#endif
|
||||||
dev->last_rx = jiffies;
|
dev->last_rx = jiffies;
|
||||||
|
|
||||||
|
/* it's OK to use per_cpu_ptr() because BHs are off */
|
||||||
pcpu_lstats = netdev_priv(dev);
|
pcpu_lstats = netdev_priv(dev);
|
||||||
lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id());
|
lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id());
|
||||||
lb_stats->bytes += skb->len;
|
lb_stats->bytes += skb->len;
|
||||||
|
@ -221,7 +222,8 @@ static void loopback_dev_free(struct net_device *dev)
|
||||||
}
|
}
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* The loopback device is special. There is only one instance.
|
* The loopback device is special. There is only one instance
|
||||||
|
* per network namespace.
|
||||||
*/
|
*/
|
||||||
static void loopback_setup(struct net_device *dev)
|
static void loopback_setup(struct net_device *dev)
|
||||||
{
|
{
|
||||||
|
|
Loading…
Reference in New Issue