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percpu: add __percpu sparse annotations to net drivers

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Add __percpu sparse annotations to net drivers.

These annotations are to make sparse consider percpu variables to be
in a different address space and warn if accessed without going
through percpu accessors.  This patch doesn't affect normal builds.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: David S. Miller <davem@davemloft.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tejun Heo
2010-02-16 15:21:08 +00:00
committed by David S. Miller
parent 7d720c3e4f
commit 47d742752d
4 changed files with 13 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/net/loopback.c
+9 -7
View File
@@ -72,7 +72,8 @@ struct pcpu_lstats {
static netdev_tx_t loopback_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct pcpu_lstats *pcpu_lstats, *lb_stats;
struct pcpu_lstats __percpu *pcpu_lstats;
struct pcpu_lstats *lb_stats;
int len;
skb_orphan(skb);
@@ -80,7 +81,7 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
skb->protocol = eth_type_trans(skb, dev);
/* it's OK to use per_cpu_ptr() because BHs are off */
pcpu_lstats = dev->ml_priv;
pcpu_lstats = (void __percpu __force *)dev->ml_priv;
lb_stats = this_cpu_ptr(pcpu_lstats);
len = skb->len;
@@ -95,14 +96,14 @@ static netdev_tx_t loopback_xmit(struct sk_buff *skb,
static struct net_device_stats *loopback_get_stats(struct net_device *dev)
{
const struct pcpu_lstats *pcpu_lstats;
const struct pcpu_lstats __percpu *pcpu_lstats;
struct net_device_stats *stats = &dev->stats;
unsigned long bytes = 0;
unsigned long packets = 0;
unsigned long drops = 0;
int i;
pcpu_lstats = dev->ml_priv;
pcpu_lstats = (void __percpu __force *)dev->ml_priv;
for_each_possible_cpu(i) {
const struct pcpu_lstats *lb_stats;
@@ -135,19 +136,20 @@ static const struct ethtool_ops loopback_ethtool_ops = {
static int loopback_dev_init(struct net_device *dev)
{
struct pcpu_lstats *lstats;
struct pcpu_lstats __percpu *lstats;
lstats = alloc_percpu(struct pcpu_lstats);
if (!lstats)
return -ENOMEM;
dev->ml_priv = lstats;
dev->ml_priv = (void __force *)lstats;
return 0;
}
static void loopback_dev_free(struct net_device *dev)
{
struct pcpu_lstats *lstats = dev->ml_priv;
struct pcpu_lstats __percpu *lstats =
(void __percpu __force *)dev->ml_priv;
free_percpu(lstats);
free_netdev(dev);