#define BLKGETLASTSECT _IO(0x12,108) /* get last sector of block device */
#define BLKGETSIZE _IO(0x12,96) /* return device size */
#define BLKSSZGET _IO(0x12,104) /* get block device sector size */
-#define BLKGETSIZE64 _IOR(0x12,114,sizeof(uint64_t)) /* return device size in bytes (u64 *arg) */
+#define BLKGETSIZE64 _IOR(0x12,114,uint64_t) /* return device size in bytes (u64 *arg) */
struct blkdev_ioctl_param {
unsigned int block;