X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Frcupdate.h;h=ff422d2b7f9012661e36a89213159db7da309f4e;hb=4da7e90e653d67dfd405868246d316b04852e2d5;hp=af5614856285d32e0f07d3ca7e7294b03b9b27b7;hpb=d2137d5af4259f50c19addb8246a186c9ffac325;p=pandora-kernel.git

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index af5614856285..ff422d2b7f90 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -339,6 +339,12 @@ extern int rcu_my_thread_group_empty(void);
 		((typeof(*p) __force __kernel *)(p)); \
 	})
 
+#define __rcu_access_index(p, space) \
+	({ \
+		typeof(p) _________p1 = ACCESS_ONCE(p); \
+		rcu_dereference_sparse(p, space); \
+		(_________p1); \
+	})
 #define __rcu_dereference_index_check(p, c) \
 	({ \
 		typeof(p) _________p1 = ACCESS_ONCE(p); \
@@ -428,6 +434,20 @@ extern int rcu_my_thread_group_empty(void);
 
 #define rcu_dereference_raw(p) rcu_dereference_check(p, 1) /*@@@ needed? @@@*/
 
+/**
+ * rcu_access_index() - fetch RCU index with no dereferencing
+ * @p: The index to read
+ *
+ * Return the value of the specified RCU-protected index, but omit the
+ * smp_read_barrier_depends() and keep the ACCESS_ONCE().  This is useful
+ * when the value of this index is accessed, but the index is not
+ * dereferenced, for example, when testing an RCU-protected index against
+ * -1.  Although rcu_access_index() may also be used in cases where
+ * update-side locks prevent the value of the index from changing, you
+ * should instead use rcu_dereference_index_protected() for this use case.
+ */
+#define rcu_access_index(p) __rcu_access_index((p), __rcu)
+
 /**
  * rcu_dereference_index_check() - rcu_dereference for indices with debug checking
  * @p: The pointer to read, prior to dereferencing