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 <[EMAIL PROTECTED]>
---
drivers/net/loopback.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index 2617320..cba5c76 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)
{
--
1.5.3.rc6.17.g1911
-
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