v4l2_get_unmapped_area  368 drivers/media/v4l2-core/v4l2-dev.c #define v4l2_get_unmapped_area NULL
v4l2_get_unmapped_area  370 drivers/media/v4l2-core/v4l2-dev.c static unsigned long v4l2_get_unmapped_area(struct file *filp,