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yaml --- r: 278334 b: refs/heads/master c: b4e1661 h: refs/heads/master v: v3
git-mirror · Dec 3, 2011 · 8ce3b36 · 8ce3b36
1 parent 466cb7d
commit 8ce3b36
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Showing 2 changed files with 22 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 86b1309c7e411b7c25dc0dc7a092582a4d291044
+refs/heads/master: b4e16611c4e1cd98765269c8fdaf43f96baa57b1
diff --git a/trunk/include/linux/genetlink.h b/trunk/include/linux/genetlink.h
@@ -89,6 +89,27 @@ extern void genl_unlock(void);
 extern int lockdep_genl_is_held(void);
 #endif
 
+/**
+ * rcu_dereference_genl - 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 genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
+ */
+#define rcu_dereference_genl(p)					\
+	rcu_dereference_check(p, lockdep_genl_is_held())
+
+/**
+ * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
+ * @p: The pointer to read, prior to dereferencing
+ *
+ * Return the value of the specified RCU-protected pointer, but omit
+ * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
+ * caller holds genl mutex.
+ */
+#define genl_dereference(p)					\
+	rcu_dereference_protected(p, lockdep_genl_is_held())
+
 #endif /* __KERNEL__ */
 
 #endif	/* __LINUX_GENERIC_NETLINK_H */