linux-kernel - Re: [PATCH] early-quirks: remove duplicate #ifdef

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Date:	Wed, 08 Apr 2009 10:02:54 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] early-quirks: remove duplicate #ifdef

Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>
>   
>> "#if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)" was repeated
>> twice.
>>
>> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
>>     
>
> hm, this was due to the patch below. Your patch essentially reverts 
> that patch?
>   

Is that patch the result of a merge?

With that patch in place, the code structure is essentially:

#if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
#if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
{
	...
}
#endif

...
#endif


I can't see how the inner #if is doing anything useful at all.

    J
> 	Ingo
>
> --------------->
> From a59dacfdc9ba06903652fa4883bf1106278b18ec Mon Sep 17 00:00:00 2001
> From: Ingo Molnar <mingo@...e.hu>
> Date: Fri, 17 Oct 2008 14:38:08 +0200
> Subject: [PATCH] x86 early quirks: eliminate unused function
> MIME-Version: 1.0
> Content-Type: text/plain; charset=utf-8
> Content-Transfer-Encoding: 8bit
>
> Impact: cleanup
>
> this warning:
>
>   arch/x86/kernel/early-quirks.c:99: warning: ‘ati_ixp4x0_rev’ defined but not used
>
> triggers because ati_ixp4x0_rev() is only used in the
> ACPI && X86_IO_APIC case.
>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  arch/x86/kernel/early-quirks.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kernel/early-quirks.c b/arch/x86/kernel/early-quirks.c
> index 76b8cd9..ebdb85c 100644
> --- a/arch/x86/kernel/early-quirks.c
> +++ b/arch/x86/kernel/early-quirks.c
> @@ -97,6 +97,7 @@ static void __init nvidia_bugs(int num, int slot, int func)
>  }
>  
>  #if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
> +#if defined(CONFIG_ACPI) && defined(CONFIG_X86_IO_APIC)
>  static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
>  {
>  	u32 d;
> @@ -114,6 +115,7 @@ static u32 __init ati_ixp4x0_rev(int num, int slot, int func)
>  	d &= 0xff;
>  	return d;
>  }
> +#endif
>  
>  static void __init ati_bugs(int num, int slot, int func)
>  {
>   

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