From: Eric W. Biederman Date: Fri, 28 Sep 2007 00:09:39 +0000 (-0700) Subject: [NET]: Bring comments in loopback.c uptodate. X-Git-Tag: v2.6.24-rc1~1454^2~274 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9e0db4b12c7deda532ad13d37a84ee41dd691066;p=platform%2Fupstream%2Fkernel-adaptation-pc.git [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 --- diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c index 2617320..d6997ae 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) {