#define CDRV 0
#define BDRV 1
#ifndef MAX_CHRDEV
#define MAX_CHRDEV 32
#define MAX_CHRDEV 64
#endif
#ifndef MAX_BLKDEV
#define MAX_BLKDEV 32
#define MAX_BLKDEV 64
#define MAX_DEV MAX(MAX_CHRDEV, MAX_BLKDEV)