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>
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@ -749,6 +749,17 @@ extern int rtnl_is_locked(void);
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extern int lockdep_rtnl_is_held(void);
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extern int lockdep_rtnl_is_held(void);
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#endif /* #ifdef CONFIG_PROVE_LOCKING */
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#endif /* #ifdef CONFIG_PROVE_LOCKING */
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/**
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* rcu_dereference_rtnl - rcu_dereference with debug checking
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* @p: The pointer to read, prior to dereferencing
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*
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* Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
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* or RTNL
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*/
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#define rcu_dereference_rtnl(p) \
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rcu_dereference_check(p, rcu_read_lock_held() || \
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lockdep_rtnl_is_held())
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extern void rtnetlink_init(void);
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extern void rtnetlink_init(void);
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extern void __rtnl_unlock(void);
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extern void __rtnl_unlock(void);
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