Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754697AbYGWTuf (ORCPT ); Wed, 23 Jul 2008 15:50:35 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753475AbYGWTu1 (ORCPT ); Wed, 23 Jul 2008 15:50:27 -0400 Received: from yw-out-2324.google.com ([74.125.46.30]:4735 "EHLO yw-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753091AbYGWTu0 (ORCPT ); Wed, 23 Jul 2008 15:50:26 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:to:subject:cc:in-reply-to:mime-version :content-type:content-transfer-encoding:content-disposition :references; b=di9IB37oFg35Zl9yG07gGcUUPAFaTnr8ZPepuCw+t3swVPVCdoTHo8L/kAE1wr1/cH bNtB0/3KTxCZ8S0Sx2tMQyuw5t6x4shFLqk0rIgiMj7EXsqsVrswsjwbKGj1ocE1+kds peS8Ww84hbddfCND7VKw+Y03Xk3JzA4bZOb5g= Message-ID: Date: Wed, 23 Jul 2008 21:50:24 +0200 From: "Fabio Comolli" To: "Bjorn Helgaas" Subject: Re: New conflict message in latest GIT Cc: "Linux Kernel Mailing List" , "Rene Herman" , "Andrew Morton" , "Thomas Renninger" , "Jean Delvare" In-Reply-To: <200807231256.42743.bjorn.helgaas@hp.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Content-Disposition: inline References: <200807231256.42743.bjorn.helgaas@hp.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2237 Lines: 54 Hi. On Wed, Jul 23, 2008 at 8:56 PM, Bjorn Helgaas wrote: > On Tuesday 22 July 2008 12:56:36 pm Fabio Comolli wrote: >> Linus' GIT tree 2.6.26-05752-g93ded9b shows this message: >> >> i801_smbus 0000:00:1f.3: PCI INT B -> GSI 19 (level, low) -> IRQ 19 >> ACPI: I/O resource 0000:00:1f.3 [0x18e0-0x18ff] conflicts with ACPI >> region SMBI [0x18e0-0x18ef] >> ACPI: Device needs an ACPI driver >> >> There is no equivalent in 2.6.26 or previous kernels. > > The "ACPI: I/O resource ... conflicts with ..." message was added by > Thomas: > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=df92e695998e1bc6e426a840eb86d6d1ee87e2a5 > > That conflict checking infrastructure was in 2.6.26, but Jean's > change to make the i801_smbus driver use it didn't happen until > about a week ago: > http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=54fb4a05af0a4b814e6716cfdf3fa97fc6be7a32 > > The message is telling us that the i801_smbus driver thinks it owns > the 0x18e0-0x18ff region, but there's also an ACPI opregion that > references that region. There's no coordination between ACPI and > the i801_smbus driver, so there may be issues where nearly > simultaneous accesses cause incorrect behavior, e.g,. one may > read the wrong value from a temperature sensor. That, of course, > can lead to more serious things like unintended machine shutdowns. > > I don't have any ideas about how to address this. I think Thomas's > intent was to collect better information for unreproducible bugs. > (Maybe this sort of conflict should even set a taint flag?) > OK, I actually didn't even know what i801_smbus (i2c_801 I suppose) was. It seems that my laptop has a super-IO chip which is detected by lm-sensors as `Nat. Semi. PC87591 Super IO' which doesn't have a driver and never will. So, if I'm correct, this modules is totally useless for me and I better compile it out. Am I correct? > Bjorn > > Regards, Fabio -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/