linux-kernel - Re: [PATCH] Fixup MODULE_DEVICE

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Message-ID: <20081203225647.GA13847@x200.localdomain>
Date:	Thu, 4 Dec 2008 01:56:47 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fixup MODULE_DEVICE_TABLE(dmi, ...)

On Wed, Dec 03, 2008 at 09:03:21AM +0000, David Woodhouse wrote:
> On Wed, 2008-12-03 at 00:41 -0800, Andrew Morton wrote:
> > The changelog is too crappy for me.  Why did that error occur, and how
> > does the patch fix it?
> 
> Well, you repeated the explanation of what's wrong -- although I don't
> see how it actually causes an _error_; it works here.

It's just gcc version,

	gcc version 3.4.6 (Gentoo 3.4.6-r2 p1.5)

which is 5-10% faster than 4.1.2, that's why I switched back to it.

> The problem is that the MODULE_DEVICE_TABLE(dmi, foo) line expands to...
> 
> extern const struct dmi_device_id __mod_dmi_device_table
>       __attribute__ ((unused, alias("foo")));
> 
> And 'struct dmi_device_id' doesn't exist -- what we have is 'struct
> dmi_system_id'.
> 
> In practice, this doesn't seem to matter because we never ask the
> compiler to look _inside_ that struct -- it's just like a forward
> declaration of 'struct foo' and then using pointers to it.
> 
> But it looks like Alexey's managed to find a way to actually make a
> compiler barf on it, so that increases the motivation to fix it
> promptly...
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