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From: Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH 5/6] x86: ifdef ioapic related function out
Date: Mon, 14 Feb 2011 12:00:39 +0100
Lines: 34
Message-ID: <20110214110039.GA7140@elte.hu>
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Cc: mingo@readhat.com, tglx@linutronix.de, hpa@zytor.com,
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To: Henrik Kretzschmar <henne@nachtwindheim.de>
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* Henrik Kretzschmar <henne@nachtwindheim.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@nachtwindheim.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