linux-kernel - Re: [tip:irq/numa] x86: read apic ID in the !acpi

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Message-ID: <20090512170246.GB12820@lenovo>
Date:	Tue, 12 May 2009 21:02:46 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Yinghai Lu <yinghai@...nel.org>, mingo@...hat.com, hpa@...or.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	eswierk@...stanetworks.com, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:irq/numa] x86: read apic ID in the !acpi_lapic case

[Ingo Molnar - Tue, May 12, 2009 at 06:46:17PM +0200]
| 
| got this on a testbox:
| 
| [    0.113333] WARNING: at arch/x86/kernel/apic/apic.c:253 warn_slowpath_null+0x28/0x50()
| 
| 	Ingo
|

It's expected (unfortunately). If we have SMP compiled kernel
we still rely on apic_read heavily. Since for fake'ed apic
we just return 0 for any reading I suspect we could just drop
WARN_ON_ONCE for native_apic_read_dummy. Yinghai?

(well, actually we should clean up callees but it would require
 some effort)
 
	-- Cyrill
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