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Commit a6e0fc85 authored by Eric Dumazet's avatar Eric Dumazet Committed by David S. Miller
Browse files

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: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a7a4f1c1

include/linux/rtnetlink.h

+11 −0
Original line number Diff line number Diff line
@@ -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);