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| author | Eric W. Biederman <ebiederm@xmission.com> | 2007-09-27 17:09:39 -0700 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2007-10-10 16:53:29 -0700 |
| commit | 9e0db4b12c7deda532ad13d37a84ee41dd691066 (patch) | |
| tree | 6701d28ea9e22be4a2b9ff2904f9d7a4a3d1fe52 /drivers/net/loopback.c | |
| parent | fe242cfd3390b1c7d54d60f7ebb6a4054804cd41 (diff) | |
| download | lwn-9e0db4b12c7deda532ad13d37a84ee41dd691066.tar.gz lwn-9e0db4b12c7deda532ad13d37a84ee41dd691066.zip | |
[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.c | 4 |
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) #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) { |