linux-kernel - Re: [PATCH] x86: read apic id if it is not acpi

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Message-ID: <20090502070254.GA4791@lenovo>
Date:	Sat, 2 May 2009 11:02:54 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ed Swierk <eswierk@...stanetworks.com>
Subject: Re: [PATCH] x86: read apic id if it is not acpi_lapic

[Yinghai Lu - Fri, May 01, 2009 at 09:48:34PM -0700]
| 
| Ed found that on 32bit, boot_cpu_physical_apicid is not read right,
| when mptable is broken.
| 
| interesting, actually three path
| 1. acpi: at that time, at that time that is already read from reg.
| 2. mptable: that only read from mptable.
| 3. no madt, and no mptable, that use default apic id 0 for 64bit, -1 for 32bit
| 
| so could read that apic id for 2/3 path.
| 
| also could avoid set fixmap that lapic two times when acpi_lapic is used.
| and need to move cpu_has_apic earlier and call apic_disable()
| 
| Reported-by: Ed Swierk <eswierk@...stanetworks.com>
| Signed-off-by: Yinghai Lu <yinghai@...nel.org>
| Cc: Cyrill Gorcunov <gorcunov@...nvz.org>
| 

Thanks Yinghai! My Ack if needed.

	-- Cyrill
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