Adding new IOCTL's into kernel (number range)

StackOverflow https://stackoverflow.com/questions/8922102

  •  30-10-2019
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سؤال

I'm writing new kernel module and I add implement new IOCTL's.
Is there any rule that I should follow with IOCTL's numbering ?
Maybe there is some "user range" ?

I work with kernel 2.6.21 on embedded platform.

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