linux-kernel - Re: [patch 1/3] m68k/mac: Make mac_hid_mouse_emulate

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Date:	Sat, 21 Jul 2007 10:27:47 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Adrian Bunk <bunk@...sta.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-m68k@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-input@...ey.karlin.mff.cuni.cz, linuxppc-dev@...abs.org
Subject: Re: [patch 1/3] m68k/mac: Make mac_hid_mouse_emulate_buttons()
 declaration visible

On Fri, 20 Jul 2007, Dmitry Torokhov wrote:
> On 7/20/07, Adrian Bunk <bunk@...sta.de> wrote:
> > On Fri, Jul 20, 2007 at 01:47:36PM -0400, Dmitry Torokhov wrote:
> > > On 7/20/07, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > >> From: Geert Uytterhoeven <geert@...ux-m68k.org>
> > >>
> > >> m68k/mac: Make mac_hid_mouse_emulate_buttons() declaration visible
> > >>
> > >> drivers/char/keyboard.c: In function 'kbd_keycode':
> > >> drivers/char/keyboard.c:1142: error: implicit declaration of function
> > >> 'mac_hid_mouse_emulate_buttons'
> > >>
> > >> The forward declaration of mac_hid_mouse_emulate_buttons() is not visible
> > >> on
> > >> m68k because it's hidden in the middle of a big #ifdef block.
> > >>
> > >> Move it to <linux/hid.h>, correct the type of the second parameter, and
> > >> include <linux/hid.h> where needed.
> > >
> > > linux/hid.h contains definitions needed for drivers speaking HID
> > > protocol, I don't think we want to put quirks for legacy keyboard
> > > driver there. I'd just move the #ifdef within drivers/char/keyboard.c
> > > for now.
> > >...
> > 
> > If you only move it you will keep the bug of the wrong second parameter.
> > 
> > But if you move it to any header file gcc is able to figure out such
> > errors itself instead of them being nasty runtime errors.
> > 
> > Such prototypes in C files are really bad since (like in this case) they
> > prevent the finding of bugs. It doesn't matter which header file you put
> > the prototype into (it can even be a new one), but it belongs into a
> > header file.
> > 
> 
> I am OK with adding a new header file. I was just saying that placing
> that declaration in linux/hid.h makes about the same sense as putting
> it into linux/scsi.h

At first I just wanted to move it. Then I thought about the angry
comments I would get about not moving it to a header file ;-)

<linux/hid.h> looked like the best candidate. <linux/kbd_kern.h> is
another option.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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