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The C and C++ Include Header Files

cat -n /usr/include/linux/kdev_t.h

     1	/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
     2	#ifndef _LINUX_KDEV_T_H
     3	#define _LINUX_KDEV_T_H
     4	
     5	/*
     6	Some programs want their definitions of MAJOR and MINOR and MKDEV
     7	from the kernel sources. These must be the externally visible ones.
     8	*/
     9	#define MAJOR(dev)	((dev)>>8)
    10	#define MINOR(dev)	((dev) & 0xff)
    11	#define MKDEV(ma,mi)	((ma)<<8 | (mi))
    12	#endif /* _LINUX_KDEV_T_H */