Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[pandora-kernel.git] / include / linux / rcupdate.h

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index af56148..ff422d2 100644 (file)
--- 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