__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);