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-rw-r--r--include/linux/rcupdate.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 96f1baf62ab8..de50d8a4cf41 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -413,6 +413,22 @@ static inline void rcu_preempt_sleep_check(void) { }
})
/**
+ * rcu_swap_protected() - swap an RCU and a regular pointer
+ * @rcu_ptr: RCU pointer
+ * @ptr: regular pointer
+ * @c: the conditions under which the dereference will take place
+ *
+ * Perform swap(@rcu_ptr, @ptr) where @rcu_ptr is an RCU-annotated pointer and
+ * @c is the argument that is passed to the rcu_dereference_protected() call
+ * used to read that pointer.
+ */
+#define rcu_swap_protected(rcu_ptr, ptr, c) do { \
+ typeof(ptr) __tmp = rcu_dereference_protected((rcu_ptr), (c)); \
+ rcu_assign_pointer((rcu_ptr), (ptr)); \
+ (ptr) = __tmp; \
+} while (0)
+
+/**
* rcu_access_pointer() - fetch RCU pointer with no dereferencing
* @p: The pointer to read
*