linux-kernel - Re: [PATCH 2/2 -tip] drm/i915: intel_lvds.c fix section mismatch warning

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Message-Id: <1243577795.3159.27.camel@localhost.localdomain>
Date:	Fri, 29 May 2009 11:46:35 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Jarod Wilson <jarod@...hat.com>, Len Brown <lenb@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Airlie <airlied@...ux.ie>,
	drm list <dri-devel@...ts.sf.net>
Cc:	Ingo Molnar <mingo@...e.hu>, Eric Anholt <eric@...olt.net>,
	mjg@...hat.com, Sam Ravnborg <sam@...nborg.org>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2 -tip] drm/i915: intel_lvds.c fix section mismatch
 warning

On Thu, 2009-05-28 at 11:00 -0400, Jarod Wilson wrote:
> On Wednesday 20 May 2009 02:27:35 Jaswinder Singh Rajput wrote:
> > 
> > intel_no_lvds[] does not require __initdata as it is used only by :
> > 
> >   void intel_lvds_init(struct drm_device *dev)
> > 
> > fixes section mismatch warning:
> > 
> >   WARNING: drivers/gpu/drm/i915/i915.o(.text+0xf3c5): Section mismatch in reference from the function intel_lvds_init() to the variable .init.data:intel_no_lvds
> >   The function intel_lvds_init() references
> >   the variable __initdata intel_no_lvds.
> >   This is often because intel_lvds_init lacks a __initdata
> 
> This would seem to suggest __initdata should be added to
> intel_lvds_init, rather than removed from intel_no_lvds...
> 

The complete statement is :

WARNING: drivers/gpu/drm/i915/i915.o(.text+0xf3c5): Section mismatch in reference from the function intel_lvds_init() to the variable .init.data:intel_no_lvds
The function intel_lvds_init() references
the variable __initdata intel_no_lvds.
This is often because intel_lvds_init lacks a __initdata 
annotation or the annotation of intel_no_lvds is wrong.

> But I suppose either one would work. Apologies for not
> catching the initial mismatch... :\
> 

No another way it will not work.

As intel_no_lvds is used by intel_lvds_init and dmi_check_system.

We can not set intel_lvds_init as intel_lvds_init is used by :
  static void intel_setup_outputs(struct drm_device *dev)

We can not set dmi_check_system to __init as it is also exported.

So the only option is to remove __initdata.

It seems the first patch : "[PATCH 1/2 -tip] drm/i915: acpi/video.c fix
section mismatch warning" is applied in acpi tree by Len Brown.

I am not sure where this patch should go.

So I am also mailing to Andrew and Dave, it they find this useful then
they can add in their tree.

> > Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> > ---
> >  drivers/gpu/drm/i915/intel_lvds.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
> > index 439a865..5ffadf9 100644
> > --- a/drivers/gpu/drm/i915/intel_lvds.c
> > +++ b/drivers/gpu/drm/i915/intel_lvds.c
> > @@ -391,7 +391,7 @@ static int __init intel_no_lvds_dmi_callback(const struct dmi_system_id *id)
> >  }
> >  
> >  /* These systems claim to have LVDS, but really don't */
> > -static const struct dmi_system_id __initdata intel_no_lvds[] = {
> > +static const struct dmi_system_id intel_no_lvds[] = {
> >  	{
> >  		.callback = intel_no_lvds_dmi_callback,
> >  		.ident = "Apple Mac Mini (Core series)",
> 
> 

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