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

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Date:	Sun, 19 Apr 2009 11:47:08 +0200
From:	Marcin Slusarz <marcin.slusarz@...il.com>
To:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	rakib.mullick@...il.com, akpm@...ux-foundation.org,
	tglx@...utronix.de, mingo@...e.hu
CC:	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/urgent] x86: Fix false positive section mismatch warnings
 in the apic code

tip-bot for Rakib Mullick pisze:
> Commit-ID:  aa57a15ad17d284e62fbd24cf7e0eb628b2cb3f7
> Gitweb:     http://git.kernel.org/tip/aa57a15ad17d284e62fbd24cf7e0eb628b2cb3f7
> Author:     Rakib Mullick <rakib.mullick@...il.com>
> AuthorDate: Sun, 19 Apr 2009 08:41:17 +0600
> Committer:  Ingo Molnar <mingo@...e.hu>
> CommitDate: Sun, 19 Apr 2009 11:28:18 +0200
> 
> x86: Fix false positive section mismatch warnings in the apic code
> 
> find_unisys_acpi_oem_table() and unmap_unisys_acpi_oem_table() are non
> init functions, but these functions calls some init functions. But we
> need these functions as non-init functions.

Why? This warning seems to be valid.

> 
> So annotate them via __ref.
> 
> The following false positive warnings are fixed via this:
> 
>   WARNING: vmlinux.o(.text+0x16250): Section mismatch in reference from
>   the function find_unisys_acpi_oem_table() to the function
>   .init.text:early_acpi_os_unmap_memory()
>   The function find_unisys_acpi_oem_table() references
>   the function __init early_acpi_os_unmap_memory().
>   This is often because find_unisys_acpi_oem_table lacks a __init
>   annotation or the annotation of early_acpi_os_unmap_memory is wrong.
> 
>   WARNING: vmlinux.o(.text+0x16269): Section mismatch in reference from
>   the function find_unisys_acpi_oem_table() to the function
>   .init.text:early_acpi_os_unmap_memory()
>   The function find_unisys_acpi_oem_table() references
>   the function __init early_acpi_os_unmap_memory().
>   This is often because find_unisys_acpi_oem_table lacks a __init
>   annotation or the annotation of early_acpi_os_unmap_memory is wrong.
> 
>   WARNING: vmlinux.o(.text+0x16279): Section mismatch in reference from
>   the function find_unisys_acpi_oem_table() to the function
>   .init.text:__acpi_map_table()
>   The function find_unisys_acpi_oem_table() references
>   the function __init __acpi_map_table().
>   This is often because find_unisys_acpi_oem_table lacks a __init
>   annotation or the annotation of __acpi_map_table is wrong.
> 
>   WARNING: vmlinux.o(.text+0x16297): 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.
> 
> [ Impact: annotate away section mismatch warnings ]
> 
> Signed-off-by: Rakib Mullick <rakib.mullick@...il.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> LKML-Reference: <b9df5fa10904181941u4a73fc97i80dfa90a50b8daf5@...l.gmail.com>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> 
> 
> ---
>  arch/x86/kernel/apic/es7000_32.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/apic/es7000_32.c b/arch/x86/kernel/apic/es7000_32.c
> index 1c11b81..96c150c 100644
> --- a/arch/x86/kernel/apic/es7000_32.c
> +++ b/arch/x86/kernel/apic/es7000_32.c
> @@ -254,7 +254,7 @@ static int parse_unisys_oem(char *oemptr)
>  }
>  
>  #ifdef CONFIG_ACPI
> -static int find_unisys_acpi_oem_table(unsigned long *oem_addr)
> +static int __ref find_unisys_acpi_oem_table(unsigned long *oem_addr)
>  {
>  	struct acpi_table_header *header = NULL;
>  	struct es7000_oem_table *table;
> @@ -285,7 +285,7 @@ static int find_unisys_acpi_oem_table(unsigned long *oem_addr)
>  	return 0;
>  }
>  
> -static void unmap_unisys_acpi_oem_table(unsigned long oem_addr)
> +static void __ref unmap_unisys_acpi_oem_table(unsigned long oem_addr)
>  {
>  	if (!oem_addr)
>  		return;
> --
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