[PATCH 4/8] percpu: add __percpu sparse annotations to net drivers

Tejun Heo
2010-01-25T15:20:53Z

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>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Arnd Bergmann <arnd@arndb.de>
---
drivers/net/chelsio/sge.c | 2 +-
drivers/net/loopback.c | 16 +++++++++-------
drivers/net/macvlan.c | 2 +-
drivers/net/veth.c | 4 ++--
4 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/drivers/net/chelsio/sge.c b/drivers/net/chelsio/sge.c
index 109d278..8e12505 100644
--- a/drivers/net/chelsio/sge.c
+++ b/drivers/net/chelsio/sge.c
@@ -267,7 +267,7 @@ struct sge {
struct sk_buff *espibug_skb[MAX_NPORTS];
u32 sge_control; /* shadow value of sge control reg */
struct sge_intr_counts stats;
- struct sge_port_stats *port_stats[MAX_NPORTS];
+ struct sge_port_stats __percpu *port_stats[MAX_NPORTS];
struct sched *tx_sched;
struct cmdQ cmdQ[SGE_CMDQ_N] ____cacheline_aligned_in_smp;
};
diff --git a/drivers/net/loopback.c b/drivers/net/loopback.c
index b9fcc98..72b7949 100644
--- a/drivers/net/loopback.c
+++ b/drivers/net/loopback.c
@@ -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);
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 21a9c9a..4d2040c 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -59,7 +59,7 @@ struct macvlan_dev {
struct hlist_node hlist;
struct macvlan_port *port;
struct net_device *lowerdev;
- struct macvlan_rx_stats *rx_stats;
+ struct macvlan_rx_stats __percpu *rx_stats;
enum macvlan_mode mode;
};

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index 3a15de5..35609e6 100644
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -34,7 +34,7 @@ struct veth_net_stats {

struct veth_priv {
struct net_device *peer;
- struct veth_net_stats *stats;
+ struct veth_net_stats __percpu *stats;
unsigned ip_summed;
};

@@ -263,7 +263,7 @@ static int veth_change_mtu(struct net_device *dev, int new_mtu)

static int veth_dev_init(struct net_device *dev)
{
- struct veth_net_stats *stats;
+ struct veth_net_stats __percpu *stats;
struct veth_priv *priv;

stats = alloc_percpu(struct veth_net_stats);
--
1.6.4.2