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dev_t data type
Kernel data type to represent a major / minor number pair
Also called a device number.
Defined in <linux/kdev_t.h>
Linux 2.6: 32 bit size (major: 12 bits, minor: 20 bits)
Macro to compose the device number:
MKDEV(int major, int minor);
Macro to extract the minor and major numbers:
MAJOR(dev_t dev);
MINOR(dev_t dev);