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authorEric W. Biederman <ebiederm@xmission.com>2007-09-27 20:09:39 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2007-10-10 19:53:29 -0400
commit9e0db4b12c7deda532ad13d37a84ee41dd691066 (patch)
tree6701d28ea9e22be4a2b9ff2904f9d7a4a3d1fe52 /drivers/net/loopback.c
parentfe242cfd3390b1c7d54d60f7ebb6a4054804cd41 (diff)
[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>
Diffstat (limited to 'drivers/net/loopback.c')
-rw-r--r--drivers/net/loopback.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 2617320efa95..d6997aec45dd 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)
154#endif 154#endif
155 dev->last_rx = jiffies; 155 dev->last_rx = jiffies;
156 156
157 /* it's OK to use per_cpu_ptr() because BHs are off */
157 pcpu_lstats = netdev_priv(dev); 158 pcpu_lstats = netdev_priv(dev);
158 lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id()); 159 lb_stats = per_cpu_ptr(pcpu_lstats, smp_processor_id());
159 lb_stats->bytes += skb->len; 160 lb_stats->bytes += skb->len;
@@ -221,7 +222,8 @@ static void loopback_dev_free(struct net_device *dev)
221} 222}
222 223
223/* 224/*
224 * The loopback device is special. There is only one instance. 225 * The loopback device is special. There is only one instance
226 * per network namespace.
225 */ 227 */
226static void loopback_setup(struct net_device *dev) 228static void loopback_setup(struct net_device *dev)
227{ 229{