diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-09-08 14:15:32 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-09-08 14:15:32 -0700 |
| commit | a6e0fc8514d41dfdd98b1d15cacc432cf040f8af (patch) | |
| tree | 48a6b7cbae9fa0637b7f134b2d204740af783237 | |
| parent | a7a4f1c1a52912eb8b3bd4d8f628d83a8b5d69dd (diff) | |
| download | lwn-a6e0fc8514d41dfdd98b1d15cacc432cf040f8af.tar.gz lwn-a6e0fc8514d41dfdd98b1d15cacc432cf040f8af.zip | |
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>
| -rw-r--r-- | include/linux/rtnetlink.h | 11 |
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); |