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

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Message-ID: <20140220230126.GA13558@sgi.com>
Date:	Thu, 20 Feb 2014 17:01:26 -0600
From:	Russ Anderson <rja@....com>
To:	Matthew Garrett <matthew.garrett@...ula.com>
Cc:	minyard@....org, lenb@...nel.org, rjw@...ysocki.net,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	rja@....com
Subject: Re: [PATCH V2] Change ACPI IPMI support to "default y"

On Tue, Feb 18, 2014 at 11:28:29AM -0500, 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. 

Could you be more specific?  Is the problem kernel code
trying to use IPMI functionality before the ipmi_si driver
is loaded?  Or something else?

What is the "undesirable system behaviour"?


> Set the default to Y in order to encourage distributions and
> users to configure kernels to avoid awkward surprises.

What are the "awkward surprises"?

Thanks,
-- 
Russ Anderson,  Kernel and Performance Software Team Manager
SGI - Silicon Graphics Inc          rja@....com
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