static bool started OVS_GUARDED_BY(mutex);
static struct smap *system_stats OVS_GUARDED_BY(mutex);
-NO_RETURN static void *system_stats_thread_func(void *);
+OVS_NO_RETURN static void *system_stats_thread_func(void *);
static void discard_stats(void);
/* Enables or disables system stats collection, according to 'enable'. */