diff options
| -rw-r--r-- | include/linux/genetlink.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/genetlink.h b/include/linux/genetlink.h index 59311adfb0e0..73c28dea10ae 100644 --- a/include/linux/genetlink.h +++ b/include/linux/genetlink.h @@ -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 */ |