__register_chrdev_region 210 fs/char_dev.c cd = __register_chrdev_region(MAJOR(n), MINOR(n), __register_chrdev_region 240 fs/char_dev.c cd = __register_chrdev_region(0, baseminor, count, name); __register_chrdev_region 276 fs/char_dev.c cd = __register_chrdev_region(major, baseminor, count, name);