1 files changed, 14 insertions, 5 deletions

diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index c57088f575a3..1a528548cd1d 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -193,13 +193,20 @@ struct hh_cache
 {
         struct hh_cache *hh_next;       /* Next entry                        */
         atomic_t        hh_refcnt;      /* number of users                   */
-        __be16          hh_type;        /* protocol identifier, f.e ETH_P_IP
+/*
+ * We want hh_output, hh_len, hh_lock and hh_data be a in a separate
+ * cache line on SMP.
+ * They are mostly read, but hh_refcnt may be changed quite frequently,
+ * incurring cache line ping pongs.
+ */
+        __be16          hh_type ____cacheline_aligned_in_smp;
+                                        /* protocol identifier, f.e ETH_P_IP
                                          *  NOTE:  For VLANs, this will be the
                                          *  encapuslated type. --BLG
                                          */
         u16             hh_len;         /* length of header */
         int             (*hh_output)(struct sk_buff *skb);
-        rwlock_t        hh_lock;
+        seqlock_t       hh_lock;
 
         /* cached hardware header; allow for machine alignment needs.        */
 #define HH_DATA_MOD     16
@@ -522,10 +529,11 @@ struct net_device
         struct net_bridge_port  *br_port;
 
         /* class/net/name entry */
-        struct class_device     class_dev;
+        struct device           dev;
         /* space for optional statistics and wireless sysfs groups */
         struct attribute_group  *sysfs_groups[3];
 };
+#define to_net_dev(d) container_of(d, struct net_device, dev)
 
 #define NETDEV_ALIGN            32
 #define NETDEV_ALIGN_CONST      (NETDEV_ALIGN - 1)
@@ -541,7 +549,7 @@ static inline void *netdev_priv(struct net_device *dev)
 /* Set the sysfs physical device reference for the network logical device
  * if set prior to registration will cause a symlink during initialization.
  */
-#define SET_NETDEV_DEV(net, pdev)       ((net)->class_dev.dev = (pdev))
+#define SET_NETDEV_DEV(net, pdev)       ((net)->dev.parent = (pdev))
 
 struct packet_type {
         __be16                  type;   /* This is really htons(ether_type). */
@@ -581,7 +589,7 @@ extern int		dev_open(struct net_device *dev);
 extern int              dev_close(struct net_device *dev);
 extern int              dev_queue_xmit(struct sk_buff *skb);
 extern int              register_netdevice(struct net_device *dev);
-extern int              unregister_netdevice(struct net_device *dev);
+extern void             unregister_netdevice(struct net_device *dev);
 extern void             free_netdev(struct net_device *dev);
 extern void             synchronize_net(void);
 extern int              register_netdevice_notifier(struct notifier_block *nb);
@@ -899,6 +907,7 @@ static inline void netif_poll_disable(struct net_device *dev)
 
 static inline void netif_poll_enable(struct net_device *dev)
 {
+        smp_mb__before_clear_bit();
         clear_bit(__LINK_STATE_RX_SCHED, &dev->state);
 }