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To: Piotr Kaczuba <pepe@attika.ath.cx>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [x86-64] ioctl32 for USB
References: <20060626113037.GA6265@attika.ath.cx>
From: Andi Kleen <ak@suse.de>
Date: 26 Jun 2006 13:49:22 +0200
In-Reply-To: <20060626113037.GA6265@attika.ath.cx>
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Piotr Kaczuba <pepe@attika.ath.cx> writes:

> Hello!
> 
> I'm running a 64-bit kernel and 32-bit userspace. There seems to be some
> unimplemented compability ioctls regarding USB. Dmesg shows the
> following:
> 
> [184966.543022] ioctl32(hald-probe-hidd:10760): Unknown cmd fd(4)
> cmd(81004806){01} arg(ffb52dd0) on /dev/usb/hiddev0
> 
> and
> 
> [50974.410204] ioctl32(vmware-vmx:3470): Unknown cmd fd(140)
> cmd(40109980){00} arg(ffb551a0) on /proc/bus/usb/002/001
> 
> Have it been only forgotten or are there other more serious reasons that
> these ioctls are missing?

Some of the USB ioctls were basically impossible to compat due to
broken design. Maybe it's now possible with is_compat_task,
but would be still extremly ugly.

-Andi