linux-kernel - Re: [PATCH V2] Change ACPI IPMI support to "default y"

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Message-ID: <1392765307.3488.1.camel@x230.lan>
Date:	Tue, 18 Feb 2014 23:15:08 +0000
From:	Matthew Garrett <matthew.garrett@...ula.com>
To:	"rjw@...ysocki.net" <rjw@...ysocki.net>
CC:	"lenb@...nel.org" <lenb@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"minyard@....org" <minyard@....org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH V2] Change ACPI IPMI support to "default y"

On Wed, 2014-02-19 at 00:26 +0100, Rafael J. Wysocki wrote:
> On Tuesday, February 18, 2014 11:28:29 AM Matthew Garrett wrote:
> > 
> > The ACPI IPMI driver implements IPMI operation region support for the ACPI
> > core. Systems that declare ACPI operation regions may reference them at any
> > time, including during kernel initialisation. These accesses will fail
> > unless the ACPI IPMI driver is present, and undesirable system behaviour
> > may result. Set the default to Y in order to encourage distributions and
> > users to configure kernels to avoid awkward surprises.
> 
> Do you have any examples of problems caused by that or is this just theoretical
> at the moment?

For example, if you load the ACPI power meter driver before you've
installed the ACPI IPMI driver you'll typically get failures (most
vendors implement it via IPMI).

-- 
Matthew Garrett <matthew.garrett@...ula.com>