From 9e0db4b12c7deda532ad13d37a84ee41dd691066 Mon Sep 17 00:00:00 2001 From: "Eric W. Biederman" Date: Thu, 27 Sep 2007 17:09:39 -0700 Subject: [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 Signed-off-by: David S. Miller --- drivers/net/loopback.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'drivers/net/loopback.c') diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c index 2617320efa9..d6997aec45d 100644 --- a/drivers/net/loopback.c +++ b/drivers/net/loopback.c @@ -154,6 +154,7 @@ static int loopback_xmit(struct sk_buff *skb, struct net_device *dev) #endif dev->last_rx = jiffies; + /* it's OK to use per_cpu_ptr() because BHs are off */ pcpu_lstats = netdev_priv(dev); lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id()); 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) { -- cgit v1.2.3