+#include <urcu/compiler.h>
+#include <urcu/config.h>
+
+enum cmm_memorder {
+ CMM_RELAXED = 0,
+ CMM_CONSUME = 1,
+ CMM_ACQUIRE = 2,
+ CMM_RELEASE = 3,
+ CMM_ACQ_REL = 4,
+ CMM_SEQ_CST = 5,
+ CMM_SEQ_CST_FENCE = 6,
+};
+
+#ifdef CONFIG_RCU_USE_ATOMIC_BUILTINS
+
+/*
+ * Make sure that CMM_SEQ_CST_FENCE is not equivalent to other memory orders.
+ */
+urcu_static_assert(CMM_RELAXED == __ATOMIC_RELAXED, "", cmm_relaxed);
+urcu_static_assert(CMM_CONSUME == __ATOMIC_CONSUME, "", cmm_consume);
+urcu_static_assert(CMM_ACQUIRE == __ATOMIC_ACQUIRE, "", cmm_acquire);
+urcu_static_assert(CMM_RELEASE == __ATOMIC_RELEASE, "", cmm_release);
+urcu_static_assert(CMM_ACQ_REL == __ATOMIC_ACQ_REL, "", cmm_acq_rel);
+urcu_static_assert(CMM_SEQ_CST == __ATOMIC_SEQ_CST, "", cmm_seq_cst);
+
+/*
+ * This is not part of the public API. It it used internally to implement the
+ * CMM_SEQ_CST_FENCE memory order.
+ *
+ * NOTE: Using switch here instead of if statement to avoid -Wduplicated-cond
+ * warning when memory order is conditionally determined.
+ */
+static inline void cmm_seq_cst_fence_after_atomic(enum cmm_memorder mo)
+{
+ switch (mo) {
+ case CMM_SEQ_CST_FENCE:
+ cmm_smp_mb();
+ break;
+ default:
+ break;
+ }
+}
+
+#endif
+
+/*
+ * This is not part of the public API. It is used internally to convert from the
+ * CMM memory model to the C11 memory model.
+ */
+static inline int cmm_to_c11(int mo)
+{
+ if (mo == CMM_SEQ_CST_FENCE) {
+ return CMM_SEQ_CST;
+ }
+ return mo;
+}