MINORBITS           7 include/linux/kdev_t.h #define MINORMASK	((1U << MINORBITS) - 1)
MINORBITS           9 include/linux/kdev_t.h #define MAJOR(dev)	((unsigned int) ((dev) >> MINORBITS))
MINORBITS          11 include/linux/kdev_t.h #define MKDEV(ma,mi)	(((ma) << MINORBITS) | (mi))
MINORBITS          24 include/linux/tty.h #define NR_UNIX98_PTY_MAX	(1 << MINORBITS) /* Absolute limit */