Index: head/sys/dev/drm2/drm_lock.c
===================================================================
--- head/sys/dev/drm2/drm_lock.c
+++ head/sys/dev/drm2/drm_lock.c
@@ -38,7 +38,9 @@
 
 #include <dev/drm2/drmP.h>
 
+#if defined(__linux__)
 static int drm_notifier(void *priv);
+#endif
 
 static int drm_lock_take(struct drm_lock_data *lock_data, unsigned int context);
 
@@ -284,6 +286,7 @@
 	return 0;
 }
 
+#if defined(__linux__)
 /**
  * If we get here, it means that the process has called DRM_IOCTL_LOCK
  * without calling DRM_IOCTL_UNLOCK.
@@ -314,6 +317,7 @@
 	} while (prev != old);
 	return 0;
 }
+#endif
 
 /**
  * This function returns immediately and takes the hw lock