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authorEric Dumazet <eric.dumazet@gmail.com>2010-09-08 14:15:32 -0700
committerDavid S. Miller <davem@davemloft.net>2010-09-08 14:15:32 -0700
commita6e0fc8514d41dfdd98b1d15cacc432cf040f8af (patch)
tree48a6b7cbae9fa0637b7f134b2d204740af783237 /include/linux/rtnetlink.h
parenta7a4f1c1a52912eb8b3bd4d8f628d83a8b5d69dd (diff)
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>
Diffstat (limited to 'include/linux/rtnetlink.h')
-rw-r--r--include/linux/rtnetlink.h11
1 files changed, 11 insertions, 0 deletions
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 58d44491880f..263690d991a8 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -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);