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authorJohn Fastabend <john.fastabend@gmail.com>2014-09-13 07:08:20 +0400
committerDavid S. Miller <davem@davemloft.net>2014-09-13 20:30:26 +0400
commit331b72922c5f58d48fd5500acadc91777cc31970 (patch)
tree03f16a1e47e4b4c01dca29868a9b13d86634aa82 /include/linux/rtnetlink.h
parent1109c00547fc66df45b9ff923544be4c1e1bec13 (diff)
downloadlinux-331b72922c5f58d48fd5500acadc91777cc31970.tar.xz
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.h10
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
*