linux-kernel - Re: [PATCH 5/6] x86: ifdef ioapic related function out

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Date:	Mon, 14 Feb 2011 12:00:39 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Henrik Kretzschmar <henne@...htwindheim.de>
Cc:	mingo@...dhat.com, tglx@...utronix.de, hpa@...or.com,
	x86@...nel.org, tj@...nel.org, yinghai@...nel.org,
	ak@...ux.intel.com, robert.richter@....com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/6] x86: ifdef ioapic related function out


* Henrik Kretzschmar <henne@...htwindheim.de> wrote:

> arch_disable_smp_config() is an IO-APIC related function on x86,
> and should only be needed if SMP is enabled.
> But the IO-APIC code calls it when the parameter "noapic" is given to
> the kernel, which doesn't mean SMP is enabled.
> 
> Anyway this fixes compilation on x86_32 UP systems with APIC and no IO-APIC.
> 
> Signed-off-by: Henrik Kretzschmar <henne@...htwindheim.de>
> ---
>  arch/x86/kernel/apic/apic.c |    2 ++
>  1 files changed, 2 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
> index 999c531..4998f0a 100644
> --- a/arch/x86/kernel/apic/apic.c
> +++ b/arch/x86/kernel/apic/apic.c
> @@ -1218,7 +1218,9 @@ void __cpuinit setup_local_APIC(void)
>  		rdtscll(tsc);
>  
>  	if (disable_apic) {
> +#ifdef CONFIG_X86_IO_APIC
>  		arch_disable_smp_support();
> +#endif

Why not make the arch_disable_smp_support() call generic in the 
arch/x86/include/asm/smp.h file (via an inline helper) and thus
avoid an ugly #ifdef in the .c file?

Thanks,

	Ingo
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