If variable is of Type, use printk format specifier: --------------------------------------------------------- int %d or %x unsigned int %u or %x long %ld or %lx unsigned long %lu or %lx long long %lld or %llx unsigned long long %llu or %llx size_t %zu or %zx ssize_t %zd or %zx Raw pointer value SHOULD be printed with %p. The kernel supports the following extended format specifiers for pointer types: Struct Resources: %pr [mem 0x60000000-0x6fffffff flags 0x2200] or [mem 0x0000000060000000-0x000000006fffffff flags 0x2200] %pR [mem 0x60000000-0x6fffffff pref] or [mem 0x0000000060000000-0x000000006fffffff pref] For printing struct resources. The 'R' and 'r' specifiers result in a printed resource with ('R') or without ('r') a decoded flags member. MAC/FDDI addresses: %pM 00:01:02:03:04:05 For printing 6-byte MAC/FDDI addresses in hex notation. u64 SHOULD be printed with %llu/%llx, (unsigned long long): printk("%llu", (unsigned long long)u64_var); s64 SHOULD be printed with %lld/%llx, (long long): printk("%lld", (long long)s64_var); If <type> is dependent on a config option for its size (e.g., sector_t, blkcnt_t, phys_addr_t, resource_size_t) or is architecture-dependent for its size (e.g., tcflag_t), use a format specifier of its largest possible type and explicitly cast to it. Example: printk("test: sector number/total blocks: %llu/%llu\n", (unsigned long long)sector, (unsigned long long)blockcount); Reminder: sizeof() result is of type size_t. Thank you for your cooperation and attention. By Randy Dunlap <rdunlap@xenotime.net> and Andrew Murray <amurray@mpc-data.co.uk>