diff options
Diffstat (limited to 'include/linux/rtnetlink.h')
| -rw-r--r-- | include/linux/rtnetlink.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h index 58d44491880..d42f274418b 100644 --- a/include/linux/rtnetlink.h +++ b/include/linux/rtnetlink.h @@ -6,6 +6,7 @@ #include <linux/if_link.h> #include <linux/if_addr.h> #include <linux/neighbour.h> +#include <linux/netdevice.h> /* rtnetlink families. Values up to 127 are reserved for real address * families, values above 128 may be used arbitrarily. @@ -749,6 +750,35 @@ extern int rtnl_is_locked(void); extern int lockdep_rtnl_is_held(void); #endif /* #ifdef CONFIG_PROVE_LOCKING */ +/** + * rcu_dereference_rtnl - rcu_dereference with debug checking + * @p: The pointer to read, prior to dereferencing + * + * Do an rcu_dereference(p), but check caller either holds rcu_read_lock() + * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference() + */ +#define rcu_dereference_rtnl(p) \ + rcu_dereference_check(p, rcu_read_lock_held() || \ + lockdep_rtnl_is_held()) + +/** + * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL + * @p: The pointer to read, prior to dereferencing + * + * Return the value of the specified RCU-protected pointer, but omit + * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because + * caller holds RTNL. + */ +#define rtnl_dereference(p) \ + rcu_dereference_protected(p, lockdep_rtnl_is_held()) + +static inline struct netdev_queue *dev_ingress_queue(struct net_device *dev) +{ + return rtnl_dereference(dev->ingress_queue); +} + +extern struct netdev_queue *dev_ingress_queue_create(struct net_device *dev); + extern void rtnetlink_init(void); extern void __rtnl_unlock(void); |