[IPV4]: Prepare FIB core for RCU.

[firefly-linux-kernel-4.4.55.git] / include / linux / list.h

diff --git a/include/linux/list.h b/include/linux/list.h
index 0f2435f92db333878f72fd70599905cc338d5d00..9b9b0eec1e8ad866c1f453f4364778912faa79d6 100644 (file)
--- a/include/linux/list.h
+++ b/include/linux/list.h
@@ -634,6 +634,27 @@ static inline void hlist_add_after(struct hlist_node *n,
                next->next->pprev  = &next->next;
 }
 
+static inline void hlist_add_before_rcu(struct hlist_node *n,
+                                       struct hlist_node *next)
+{
+       n->pprev = next->pprev;
+       n->next = next;
+       smp_wmb();
+       next->pprev = &n->next;
+       *(n->pprev) = n;
+}
+
+static inline void hlist_add_after_rcu(struct hlist_node *prev,
+                                      struct hlist_node *n)
+{
+       n->next = prev->next;
+       n->pprev = &prev->next;
+       smp_wmb();
+       prev->next = n;
+       if (n->next)
+               n->next->pprev = &n->next;
+}
+
 #define hlist_entry(ptr, type, member) container_of(ptr,type,member)
 
 #define hlist_for_each(pos, head) \