linux-kernel - Re: [PATCH 3/6] firewire: char device interface

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Date:	Wed, 2 May 2007 20:30:26 +0100
From:	Christoph Hellwig <hch@...radead.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	linux-kernel@...r.kernel.org, Kristian H??gsberg <krh@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux1394-devel <linux1394-devel@...ts.sourceforge.net>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 3/6] firewire: char device interface

On Wed, May 02, 2007 at 02:17:26PM +0200, Stefan Richter wrote:
> +#include <asm/ioctl.h>
> +#include <asm/types.h>

Always use the <linux/ versions.

> +struct fw_cdev_get_info {
> +	/* The version field is just a running serial number.  We
> +	 * never break backwards compatibility.  Userspace passes in
> +	 * the version it expects and the kernel passes back the
> +	 * highest version it can provide.  Even if the structs in
> +	 * this interface are extended in a later version, the kernel
> +	 * will not copy back more data than what was present in the
> +	 * interface version userspace expects. */
> +	__u32 version;

Please don't even try to build interfaces this complicated.  If your
current interface needs changes at some point just introduce new ioctls.

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