__register_chrdev_region  206 fs/char_dev.c  		cd = __register_chrdev_region(MAJOR(n), MINOR(n),
__register_chrdev_region  236 fs/char_dev.c  	cd = __register_chrdev_region(0, baseminor, count, name);
__register_chrdev_region  273 fs/char_dev.c  	cd = __register_chrdev_region(major, 0, 256, name);