linux-kernel - Re: [tip:x86/urgent] x86: Fix false positive section mismatch warnings in the apic code

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Date:	Mon, 20 Apr 2009 10:00:24 +0600
From:	Rakib Mullick <rakib.mullick@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Marcin Slusarz <marcin.slusarz@...il.com>, mingo@...hat.com,
	hpa@...or.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, tglx@...utronix.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86: Fix false positive section mismatch 
	warnings in the apic code

On 4/19/09, Sam Ravnborg <sam@...nborg.org> wrote:
> If I understand it correct we have the following:

>  (data) struct apic apic_es7000.acpi_madt_oem_check =>
>  (function) es7000_acpi_madt_oem_check =>
>  (function) find_unisys_acpi_oem_table
>  (__init) early_acpi_os_unmap_memory
>
>  So the real fix is to:
>  1) annotate find_unisys_acpi_oem_table __init
>  2) annotate es7000_acpi_madt_oem_check __init
>  3) teach modpost that struct apic apic_es7000 may reference __init
>
>  Step 3 is done using __refdata
>
>  Based on the above analysis I would assume the best fix
>  would look like this the following.
>  [I only looked at the first warning]
>
>  Rabik/Marcin - if you agree in the analysis could you produce
>  a proper patch and send to Ingo - thanks.
>
>  You can add my:
>  Signed-off-by: Sam Ravnborg <sam@...nborg.org>
>  if the patch is ok.
>
>         Sam
Hi Sam, after applying your suggested three steps, we still have the
following warning:

WARNING: arch/x86/kernel/built-in.o(.text+0x36174): Section mismatch
in reference from the function unmap_unisys_acpi_oem_table() to the
function .init.text:__acpi_unmap_table()
The function unmap_unisys_acpi_oem_table() references
the function __init __acpi_unmap_table().
This is often because unmap_unisys_acpi_oem_table lacks a __init
annotation or the annotation of __acpi_unmap_table is wrong.

So, I think we've to annote unmap_unisys_acpi_oem_table with __init (
If we apply Sam's suggested steps). If anything else please notice.

Rakib.
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