linux-kernel - Re: [PATCH 01/14] [VOYAGER] x86: add {safe,hard}_smp_processor_id to smp

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Date:	Tue, 14 Apr 2009 09:35:45 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	James Bottomley <James.Bottomley@...senPartnership.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 01/14] [VOYAGER] x86: add {safe,hard}_smp_processor_id
 to smp_ops

James Bottomley wrote:
> Not having apics, Voyager can't use the default apic implementation of
> these, it has to read from a special port in the VIC to get the
> processor ID, so abstract these functions in smp_ops to allow voyager
> to live simultaneously with the apic code.
>   

I thnk we should just drop safe_smp_processor_id().  It doesn't seem to 
do anything useful.

> diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
> index 429834e..eb795bf 100644
> --- a/arch/x86/xen/smp.c
> +++ b/arch/x86/xen/smp.c
> @@ -454,6 +454,11 @@ static irqreturn_t xen_call_function_single_interrupt(int irq, void *dev_id)
>  	return IRQ_HANDLED;
>  }
>  
> +static int xen_hard_smp_processor_id(void)
> +{
> +	return read_apic_id();
> +}
>   

This should just be "return smp_processor_id()".  There are no 
meaningful APICs under Xen.

    J
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