markers: turn marker_synchronize_unregister() into an inline

Turn marker synchronize unregister into a static inline. There is no
reason to keep it as a macro over a static inline.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/marker.h

@@ -13,6 +13,7 @@
  */
 
 #include <linux/types.h>
+#include <linux/rcupdate.h>
 
 struct module;
 struct marker;
@@ -165,6 +166,9 @@ extern void *marker_get_private_data(const char *name, marker_probe_func *probe,
  * unregistration and the end of module exit to make sure there is no caller
  * executing a probe when it is freed.
  */
-#define marker_synchronize_unregister() synchronize_sched()
+static inline void marker_synchronize_unregister(void)
+{
+	synchronize_sched();
+}
 
 #endif