linux-kernel - Re: [PATCH] x86: Don't ack_APIC_irq() if lapic is disabled in GENERIC_INTERRUPT

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Date:	Sun, 20 Sep 2009 20:06:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Sheng Yang <sheng@...ux.intel.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	linux-kernel@...r.kernel.org, Dimitri Sivanich <sivanich@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH] x86: Don't ack_APIC_irq() if lapic is disabled in
	GENERIC_INTERRUPT_VECTOR handler


* Sheng Yang <sheng@...ux.intel.com> wrote:

> Otherwise would cause trouble...
> 
> Cc: Dimitri Sivanich <sivanich@....com>
> Signed-off-by: Sheng Yang <sheng@...ux.intel.com>
> ---
>  arch/x86/kernel/irq.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
> index b0cdde6..78b23d0 100644
> --- a/arch/x86/kernel/irq.c
> +++ b/arch/x86/kernel/irq.c
> @@ -257,7 +257,8 @@ void smp_generic_interrupt(struct pt_regs *regs)
>  {
>  	struct pt_regs *old_regs = set_irq_regs(regs);
>  
> -	ack_APIC_irq();
> +	if (!disable_apic)
> +		ack_APIC_irq();

Wont in that case the apic->ack method be a NOP?

	Ingo
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