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| author | John Fastabend <john.fastabend@gmail.com> | 2014-09-12 20:08:20 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-09-13 12:30:26 -0400 |
| commit | 331b72922c5f58d48fd5500acadc91777cc31970 (patch) | |
| tree | 03f16a1e47e4b4c01dca29868a9b13d86634aa82 /include/linux/rtnetlink.h | |
| parent | 1109c00547fc66df45b9ff923544be4c1e1bec13 (diff) | |
| download | lwn-331b72922c5f58d48fd5500acadc91777cc31970.tar.gz lwn-331b72922c5f58d48fd5500acadc91777cc31970.zip | |
net: sched: RCU cls_tcindex
Make cls_tcindex RCU safe.
This patch addds a new RCU routine rcu_dereference_bh_rtnl() to check
caller either holds the rcu read lock or RTNL. This is needed to
handle the case where tcindex_lookup() is being called in both cases.
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/rtnetlink.h')
| -rw-r--r-- | include/linux/rtnetlink.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h index 167bae7bdfa4..6cacbce1a06c 100644 --- a/include/linux/rtnetlink.h +++ b/include/linux/rtnetlink.h @@ -47,6 +47,16 @@ static inline int lockdep_rtnl_is_held(void) rcu_dereference_check(p, lockdep_rtnl_is_held()) /** + * rcu_dereference_bh_rtnl - rcu_dereference_bh with debug checking + * @p: The pointer to read, prior to dereference + * + * Do an rcu_dereference_bh(p), but check caller either holds rcu_read_lock_bh() + * or RTNL. Note : Please prefer rtnl_dereference() or rcu_dereference_bh() + */ +#define rcu_dereference_bh_rtnl(p) \ + rcu_dereference_bh_check(p, lockdep_rtnl_is_held()) + +/** * rtnl_dereference - fetch RCU pointer when updates are prevented by RTNL * @p: The pointer to read, prior to dereferencing * |