Message-ID: <43281D3A.9080407@didntduck.org>
Date: Wed, 14 Sep 2005 08:53:14 -0400
From: Brian Gerst <bgerst@didntduck.org>
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To: Bernhard Ager <ager@in.tum.de>
CC: vojtech@suse.cz, linux-joystick@atrey.karlin.mff.cuni.cz,
       linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Joystick on amd64 for 32bit programs
References: <20050914100244.GC9770@in.tum.de>
In-Reply-To: <20050914100244.GC9770@in.tum.de>
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Bernhard Ager wrote:
> Hi,
> 
> the patch below makes the joystick on amd64 work for 32bit
> applications. It was successfully tested by myself with X-Plane [1],
> SilentWings [2], Quake 3 [3] and quite some other applications. 
> 
> How it works: as the parameters in 32bit userspace ioctl are
> compatible with the 64bit kernel, it is sufficient to declare them
> compatible in ia32_ioctl.c. The JSIOCGNAME ioctl causes a problem as
> it encodes the length of the return buffer into the ioctl number. This
> is solved by mapping all of the JSIOCGNAME ioctls to JSIOCGNAME(0).
> 
> Patch is below and works for vanilla kernels at least up to
> 2.6.13.

This patch uses the obsolete method of defining compat ioctls.  The 
joydev ioctls are already fixed (using ->compat_ioctl) in more recent 
kernels.

--
				Brian Gerst
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