kdev_t.h
#ifndef _UAPI_LINUX_KDEV_T_H
#define _UAPI_LINUX_KDEV_T_H
#ifndef __KERNEL__
/*
Some programs want their definitions of MAJOR and MINOR and MKDEV
from the kernel sources. These must be the externally visible ones.
*/
#define MAJOR(dev) ((dev)>>8)
#define MINOR(dev) ((dev) & 0xff)
#define MKDEV(ma,mi) ((ma)<<8 | (mi))
#endif /* __KERNEL__ */
#endif /* _UAPI_LINUX_KDEV_T_H */