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Commit b4e16611 authored by Jesse Gross's avatar Jesse Gross
Browse files

genetlink: Add rcu_dereference_genl and genl_dereference. 



This adds rcu_dereference_genl and genl_dereference, which are genl
variants of the RTNL functions to enforce proper locking with lockdep
and sparse.

Signed-off-by: default avatarJesse Gross <jesse@nicira.com>
parent 86b1309c

include/linux/genetlink.h

+21 −0
Original line number Diff line number Diff line
@@ -89,6 +89,27 @@ extern void genl_unlock(void); 
extern int lockdep_genl_is_held(void);

#endif



/**

 * rcu_dereference_genl - 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 genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()

 */

#define rcu_dereference_genl(p)					\

	rcu_dereference_check(p, lockdep_genl_is_held())



/**

 * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex

 * @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 genl mutex.

 */

#define genl_dereference(p)					\

	rcu_dereference_protected(p, lockdep_genl_is_held())



#endif /* __KERNEL__ */



#endif	/* __LINUX_GENERIC_NETLINK_H */