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net: introduce rcu_dereference_rtnl 

We use rcu_dereference_check(p, rcu_read_lock_held() ||
lockdep_rtnl_is_held()) several times in network stack.

More usages to come too, so its time to create a helper.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-09-08 14:15:32 -07:00 committed by David S. Miller
parent a7a4f1c1a5
commit a6e0fc8514
1 changed files with 11 additions and 0 deletions
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11
include/linux/rtnetlink.h
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@ -749,6 +749,17 @@ 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
*/
#define rcu_dereference_rtnl(p) \
rcu_dereference_check(p, rcu_read_lock_held() || \
lockdep_rtnl_is_held())
extern void rtnetlink_init(void);
extern void __rtnl_unlock(void);