linux-kernel - Re: [PATCH] x86,nmi: Fix section mismatch warnings on 32-bit

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Date:	Tue, 5 Jun 2012 18:13:18 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Jan Beulich <JBeulich@...e.com>, x86@...nel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86,nmi: Fix section mismatch warnings on 32-bit

On Tue, Jun 05, 2012 at 10:47:34AM -0400, Don Zickus wrote:
> On Tue, Jun 05, 2012 at 09:12:13AM +0100, Jan Beulich wrote:
> > >>> On 04.06.12 at 21:56, Don Zickus <dzickus@...hat.com> wrote:
> > > It was reported that compiling for 32-bit caused a bunch of section
> > > mismatch warnings:
> > > 
> > >  VDSOSYM arch/x86/vdso/vdso32-syms.lds
> > >   LD      arch/x86/vdso/built-in.o
> > >   LD      arch/x86/built-in.o
> > > WARNING: arch/x86/built-in.o(.data+0x5af0): Section mismatch in reference 
> > > from the variable
> > > test_nmi_ipi_callback_na.10451 to the function 
> > 
> > Did you check what this (compiler introduced) variable actually
> > represents? The problem clearly is that the compiler has no way
> > of knowing that data it generates referencing an __init function
> > would actually need to go into .init.data or alike.
> 
> I do not know enough about behind the scene compiler magic to track this
> down correctly.  So any insight/help is greatly appreciated. :-)

We register a function annotated __init. And the normal use of this register()
is for functions that survive the init phase.
So drop the __init annotation on the function we register and the mismatch is fixed.

	Sam
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