linux-kernel - Re: kdbus: add header file

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Date:	Thu, 30 Oct 2014 12:26:58 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Tom Gundersen <teg@...m.no>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux API <linux-api@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Tejun Heo <tj@...nel.org>,
	Marcel Holtmann <marcel@...tmann.org>,
	Ryan Lortie <desrt@...rt.ca>,
	Bastien Nocera <hadess@...ess.net>,
	David Herrmann <dh.herrmann@...il.com>,
	Djalal Harouni <tixxdz@...ndz.org>,
	Simon McVittie <simon.mcvittie@...labora.co.uk>,
	Daniel Mack <daniel@...que.org>,
	"alban.crequy" <alban.crequy@...labora.co.uk>,
	"javier.martinez" <javier.martinez@...labora.co.uk>
Subject: Re: kdbus: add header file

On Thursday 30 October 2014 12:02:39 Tom Gundersen wrote:
> On Thu, Oct 30, 2014 at 9:20 AM, Arnd Bergmann <arnd@...db.de> wrote:
> > I think in general, using enum is great, but for ioctl command numbers,
> > we probably want to have defines so the user space implementation can
> > use #ifdef to see if the kernel version that it is being built for
> > knows a particular command.
> 
> Does that make sense for the first version? I agree that we should use
>  #define to allow #ifdef for when we add more ioctls in the future,
> but these ioctls will always exist...

It's mainly for consistency really.

> The nice thing about enums is of course that it helps with debugging
> as gdb can show the string representation rather than the number,
> because in contrast to #defines, an enum is something the compliler
> knows about.

This doesn't get passed as an enum in user space though, and when debugging
the kernel it only helps within one function.

	Arnd
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