linux-kernel - Re: 2.6.31-rc5 regression: x86 MCE malfunction on Thinkpad T42p

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Message-ID: <20090810122731.GA5863@sig21.net>
Date:	Mon, 10 Aug 2009 14:27:31 +0200
From:	Johannes Stezenbach <js@...21.net>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: 2.6.31-rc5 regression: x86 MCE malfunction on Thinkpad T42p

On Mon, Aug 10, 2009 at 12:31:47PM +0200, Andi Kleen wrote:
> Johannes Stezenbach <js@...21.net> writes:
> 
> >    Call Trace:
> >     [<c10248c1>] warn_slowpath_common+0x60/0x90
> >     [<c10248fe>] warn_slowpath_null+0xd/0x10
> >     [<c1013139>] native_apic_write_dummy+0x2d/0x39
> >     [<c100dcd2>] intel_init_thermal+0xb6/0x144
> >     [<c100d517>] ? mce_init+0x33/0xb0
> >     [<c100db4b>] mce_intel_feature_init+0xb/0x4c
> >     [<c14fc31e>] mcheck_init+0x1e2/0x253
> >     [<c14faef4>] identify_cpu+0x30b/0x31b
> >     [<c14d9af0>] identify_boot_cpu+0xd/0x23
> >     [<c14d9b3c>] check_bugs+0xb/0xd4
> >     [<c104f929>] ? delayacct_init+0x42/0x49
> >     [<c14d493c>] start_kernel+0x25e/0x26d
> >     [<c14d430b>] i386_start_kernel+0x65/0x6a
> >    ---[ end trace 4eaa2a86a8e2da22 ]---
> 
> 
> The appended patch should remove the warning. Can you please test it?

It works (no more warning), but I feel I'm better off using "lapic"
because it enables thermal monitoring and performance counters.


Thanks,
Johannes
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