From: Arnd Bergmann <arnd@arndb.de>
To: Krzysztof Halasa <khc@pm.waw.pl>
Subject: Re: [RFC] Should we create a raw input interface for IR's ? - Was: Re: [PATCH 1/3 v2] lirc core device driver infrastructure
Date: Fri, 27 Nov 2009 00:34:30 +0000
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Cc: Mauro Carvalho Chehab <mchehab@redhat.com>,
       Jarod Wilson <jarod@redhat.com>,
       Dmitry Torokhov <dmitry.torokhov@gmail.com>,
       linux-kernel@vger.kernel.org, Mario Limonciello <superm1@ubuntu.com>,
       linux-input@vger.kernel.org, linux-media@vger.kernel.org,
       Janne Grunau <j@jannau.net>, Christoph Bartelmus <lirc@bartelmus.de>
References: <200910200956.33391.jarod@redhat.com> <4B0EFC30.80208@redhat.com> <m38wdsstsv.fsf@intrepid.localdomain>
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On Friday 27 November 2009 00:19:44 Krzysztof Halasa wrote:
> Mauro Carvalho Chehab <mchehab@redhat.com> writes:
> 
> > Why do you want to replace everything into a single shot?
> 
> Why not? It seems simpler to me. We need to change this anyway.

ioctls with a variable argument length are a pain for 32 bit
emulation and stuff like strace. You either need to encode
the variable length into the ioctl cmd, making it variable
as well, or use a pointer in the data structure, which requires
conversion.

Ideally, ioctl arguments have a constant layout, no pointers
and are at most 64 bits long.

	Arnd <><
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