* drivers/video/backlight/mbp_nvidia_bl.c:114: error: storage size of '__mod_dmi_device_table' isn't known
@ 2008-11-14 23:41 Alexey Dobriyan
2008-11-15 11:14 ` David Woodhouse
0 siblings, 1 reply; 6+ messages in thread
From: Alexey Dobriyan @ 2008-11-14 23:41 UTC (permalink / raw)
To: dwmw2; +Cc: linux-kernel
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?
commit 239cfbde1f5843c4a24199f117d5f67f637d72d5
Author: David Woodhouse <dwmw2@infradead.org>
Date: Tue Sep 16 16:25:24 2008 -0700
Fix autoloading of MacBook Pro backlight driver.
Use new MODULE_DEVICE_TABLE(dmi, ...) facility. There's no need for
every driver to screw it up for themselves, when the alias can be
generated automatically.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/video/backlight/mbp_nvidia_bl.c b/drivers/video/backlight/mbp_nvidia_bl.c
index 385cba4..06964af 100644
--- a/drivers/video/backlight/mbp_nvidia_bl.c
+++ b/drivers/video/backlight/mbp_nvidia_bl.c
@@ -111,6 +111,4 @@ module_exit(mbp_exit);
MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>");
MODULE_DESCRIPTION("Nvidia-based Macbook Pro Backlight Driver");
MODULE_LICENSE("GPL");
-MODULE_ALIAS("svnAppleInc.:pnMacBookPro3,1");
-MODULE_ALIAS("svnAppleInc.:pnMacBookPro3,2");
-MODULE_ALIAS("svnAppleInc.:pnMacBookPro4,1");
+MODULE_DEVICE_TABLE(dmi, mbp_device_table);
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: drivers/video/backlight/mbp_nvidia_bl.c:114: error: storage size of '__mod_dmi_device_table' isn't known
2008-11-14 23:41 drivers/video/backlight/mbp_nvidia_bl.c:114: error: storage size of '__mod_dmi_device_table' isn't known Alexey Dobriyan
@ 2008-11-15 11:14 ` David Woodhouse
2008-11-21 1:55 ` [PATCH] Fixup MODULE_DEVICE_TABLE(dmi, ...) Alexey Dobriyan
0 siblings, 1 reply; 6+ messages in thread
From: David Woodhouse @ 2008-11-15 11:14 UTC (permalink / raw)
To: Alexey Dobriyan; +Cc: linux-kernel
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.
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@intel.com Intel Corporation
^ permalink raw reply [flat|nested] 6+ messages in thread* [PATCH] Fixup MODULE_DEVICE_TABLE(dmi, ...)
2008-11-15 11:14 ` David Woodhouse
@ 2008-11-21 1:55 ` Alexey Dobriyan
2008-12-03 8:41 ` Andrew Morton
0 siblings, 1 reply; 6+ messages in thread
From: Alexey Dobriyan @ 2008-11-21 1:55 UTC (permalink / raw)
To: David Woodhouse; +Cc: linux-kernel, akpm
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@gmail.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 }
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] Fixup MODULE_DEVICE_TABLE(dmi, ...)
2008-11-21 1:55 ` [PATCH] Fixup MODULE_DEVICE_TABLE(dmi, ...) Alexey Dobriyan
@ 2008-12-03 8:41 ` Andrew Morton
2008-12-03 9:03 ` David Woodhouse
0 siblings, 1 reply; 6+ messages in thread
From: Andrew Morton @ 2008-12-03 8:41 UTC (permalink / raw)
To: Alexey Dobriyan; +Cc: David Woodhouse, linux-kernel
On Fri, 21 Nov 2008 04:55:59 +0300 Alexey Dobriyan <adobriyan@gmail.com> wrote:
> 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 :-)
>
What happened with all this?
> [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@gmail.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 }
The changelog is too crappy for me. Why did that error occur, and how
does the patch fix it?
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] Fixup MODULE_DEVICE_TABLE(dmi, ...)
2008-12-03 8:41 ` Andrew Morton
@ 2008-12-03 9:03 ` David Woodhouse
2008-12-03 22:56 ` Alexey Dobriyan
0 siblings, 1 reply; 6+ messages in thread
From: David Woodhouse @ 2008-12-03 9:03 UTC (permalink / raw)
To: Andrew Morton; +Cc: Alexey Dobriyan, linux-kernel
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.
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...
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@intel.com Intel Corporation
^ permalink raw reply [flat|nested] 6+ messages in thread* Re: [PATCH] Fixup MODULE_DEVICE_TABLE(dmi, ...)
2008-12-03 9:03 ` David Woodhouse
@ 2008-12-03 22:56 ` Alexey Dobriyan
0 siblings, 0 replies; 6+ messages in thread
From: Alexey Dobriyan @ 2008-12-03 22:56 UTC (permalink / raw)
To: David Woodhouse; +Cc: Andrew Morton, linux-kernel
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...
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2008-12-03 22:52 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2008-11-14 23:41 drivers/video/backlight/mbp_nvidia_bl.c:114: error: storage size of '__mod_dmi_device_table' isn't known Alexey Dobriyan
2008-11-15 11:14 ` David Woodhouse
2008-11-21 1:55 ` [PATCH] Fixup MODULE_DEVICE_TABLE(dmi, ...) Alexey Dobriyan
2008-12-03 8:41 ` Andrew Morton
2008-12-03 9:03 ` David Woodhouse
2008-12-03 22:56 ` Alexey Dobriyan
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