linux-kernel - [PATCH] Fixup MODULE_DEVICE

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Message-ID: <20081121015559.GA4478@x200.localdomain>
Date:	Fri, 21 Nov 2008 04:55:59 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org
Subject: [PATCH] Fixup MODULE_DEVICE_TABLE(dmi, ...)

On Sat, Nov 15, 2008 at 11:14:52AM +0000, David Woodhouse wrote:
> On Sat, 2008-11-15 at 02:41 +0300, Alexey Dobriyan wrote:
> > How can this work, given that MODULE_DEVICE_TABLE line expands into
> > 
> >         extern const struct dmi_device_id __mod_dmi_device_table
> > __attribute__ ((unused, alias("mbp_device_table")));
> >                                 ^^^^^^
> > but there is no struct dmi_device_id, there is struct dmi_system_id?
> 
> Interesting question ;)
> 
> It actually looks like this...
> 
> static struct dmi_system_id __initdata mbp_device_table[] = {
> 	...
> };
> 
> extern const struct dmi_device_id __mod_dmi_device_table \
> 		__attribute__ ((unused, alias("mbp_device_table")));
> 
> So 'struct dmi_device_id' isn't ever really used -- it's just like a
> forward declaration of a struct, and the compiler doesn't care because
> it never needs to know anything more about that struct.
> 
> Not ideal though -- we should probably see if we can fix it. I suspect
> it's not worth a global change of dmi_system_id to dmi_device_id
> though... got any better ideas?
> 
> Maybe we could change MODULE_GENERIC_TABLE to be more agnostic about the
> datatype -- just call it and 'extern char'. After all, it's only for the
> linker.

Let's do it the most staightforward way :-)


[PATCH] Fixup MODULE_DEVICE_TABLE(dmi, ...)

drivers/video/backlight/mbp_nvidia_bl.c:114: error: storage size of '__mod_dmi_device_table' isn't known

Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---

 include/linux/mod_devicetable.h |    1 +
 1 file changed, 1 insertion(+)

--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -443,6 +443,7 @@ struct dmi_system_id {
 	struct dmi_strmatch matches[4];
 	void *driver_data;
 };
+#define dmi_device_id dmi_system_id	/* fixup MODULE_DEVICE_TABLE(dmi,...); */
 #endif
 
 #define DMI_MATCH(a, b)	{ a, b }
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