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Date: Mon, 11 May 2009 11:26:55 +0200
From: Ingo Molnar <mingo@elte.hu>
To: Yinghai Lu <yinghai@kernel.org>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>, Thomas Gleixner <tglx@linutronix.de>,
       "H. Peter Anvin" <hpa@zytor.com>,
       "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
       Ed Swierk <eswierk@aristanetworks.com>
Subject: Re: [PATCH] x86: read apic id if it is not acpi_lapic -v2
Message-ID: <20090511092655.GC26444@elte.hu>
References: <20090430084145.GD21699@elte.hu> <49FBD0A2.4030309@kernel.org> <20090502070254.GA4791@lenovo> <49FC85A9.2070702@kernel.org>
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* Yinghai Lu <yinghai@kernel.org> wrote:

> @@ -1590,21 +1591,32 @@ void __init init_apic_mappings(void)
>  	} else
>  		apic_phys = mp_lapic_addr;
>  
> -	set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
> +	/* lets check if we may to NOP'ify apic operations */
> +	if (!cpu_has_apic) {
> +		pr_info("APIC: disable apic facility\n");
> +		apic_disable();
> +		return;
> +	}
> +
> +	/*
> +	 * acpi lapic path already map that address in
> +	 * acpi_register_lapic_address()
> +	 */
>  	apic_printk(APIC_VERBOSE, "mapped APIC to %08lx (%08lx)\n",
>  				APIC_BASE, apic_phys);
> +	if (acpi_lapic)
> +		return;

why do we return here? We should sanity-check the APIC ID even if we 
come from ACPI.

	Ingo