CONFIG_V4L2_MEM2MEM_DEV 2791 drivers/media/v4l2-core/v4l2-ioctl.c #if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV)
CONFIG_V4L2_MEM2MEM_DEV   56 include/media/v4l2-fh.h #if IS_ENABLED(CONFIG_V4L2_MEM2MEM_DEV)