tag	line	file	source code
SNDCTL_DSP_SYNC	350	drivers/sound/audio.c	case SNDCTL_DSP_SYNC:
SNDCTL_DSP_SYNC	715	drivers/sound/dmabuf.c	case SNDCTL_DSP_SYNC:
SNDCTL_DSP_SYNC	655	include/linux/soundcard.h	#define SOUND_PCM_SYNC      SNDCTL_DSP_SYNC