linux-kernel - Re: How does the size field work in IOCTL numbers?

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Message-ID: <20160903123544.GE2794@worktop>
Date:   Sat, 3 Sep 2016 14:35:44 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Keno Fischer <keno@...iacomputing.com>
Cc:     linux-kernel@...r.kernel.org, vincent.weaver@...ne.edu,
        mingo@...hat.com
Subject: Re: How does the size field work in IOCTL numbers?

On Fri, Sep 02, 2016 at 07:27:27PM -0400, Keno Fischer wrote:
> I don't understand what the rule is for what to put in that third
> argument, or is it ioctl specific? Please let me know if I missed
> something.

You can do whatever you like, but everything that is different between
ILP32 and LP64 requires COMPAT fixups.