+#ifdef LTTNG_UST_HAVE_PERF_EVENT
+void lttng_ust_fixup_perf_counter_tls(void);
+void lttng_perf_lock(void);
+void lttng_perf_unlock(void);
+#else /* #ifdef LTTNG_UST_HAVE_PERF_EVENT */
+static inline
+void lttng_ust_fixup_perf_counter_tls(void)
+{
+}
+static inline
+void lttng_perf_lock(void)
+{
+}
+static inline
+void lttng_perf_unlock(void)
+{
+}
+#endif /* #else #ifdef LTTNG_UST_HAVE_PERF_EVENT */
+