16 #define LENGTH (256UL*1024*1024)  macro
24 static void write_bytes(char *addr, size_t length)  in write_bytes()  argument
28 	for (i = 0; i < length; i++)  in write_bytes()
32 static void read_bytes(char *addr, size_t length)  in read_bytes()  argument
37 	for (i = 0; i < length; i++)  in read_bytes()
48 	size_t length = LENGTH;  in main()  local
53 	/* munmap with fail if the length is not page aligned */  in main()
54 	if (hugepage_size > length)  in main()
55 		length = hugepage_size;  in main()
61 		length = atol(argv[1]) << 20;  in main()
72 	ksft_print_msg("Mapping %lu Mbytes\n", (unsigned long)length >> 20);  in main()
74 	addr = mmap(NULL, length, PROTECTION, flags, -1, 0);  in main()
80 	write_bytes(addr, length);  in main()
81 	read_bytes(addr, length);  in main()
83 	/* munmap() length of MAP_HUGETLB memory must be hugepage aligned */  in main()
84 	if (munmap(addr, length))  in main()