snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
void __user **bufs, snd_pcm_uframes_t frames);
+extern const struct snd_pcm_hw_constraint_list snd_pcm_known_rates;
+
int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime);
static inline void snd_pcm_set_runtime_buffer(struct snd_pcm_substream *substream,