SNDRV_PCM_IOCTL_USER_PVERSION 663 sound/core/pcm_compat.c case SNDRV_PCM_IOCTL_USER_PVERSION: SNDRV_PCM_IOCTL_USER_PVERSION 2924 sound/core/pcm_native.c case SNDRV_PCM_IOCTL_USER_PVERSION: