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

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Message-ID: <4A09ADE5.3010102@kernel.org>
Date:	Tue, 12 May 2009 10:12:05 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
CC:	Ingo Molnar <mingo@...e.hu>, 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

Cyrill Gorcunov wrote:
> [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)

32bit seems doesn't have this warning.

and on 64bit, we always assumed have local APIC there. so could be that noapic is not cleanly enforced

YH
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