linux-kernel - Re: [PATCH] ACPI: Adjust the return value of

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Message-ID: <20150324180156.GA14658@srcf.ucam.org>
Date:	Tue, 24 Mar 2015 18:01:56 +0000
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Mario Limonciello <mario_limonciello@...l.com>
Cc:	Matt Fleming <matt@...eblueprint.co.uk>,
	Jason Ekstrand <jason@...kstrand.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Bard Liao <bardliao@...ltek.com>,
	Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"lenb@...nel.org" <lenb@...nel.org>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: [PATCH] ACPI: Adjust the return value of _REV on x86

On Tue, Mar 24, 2015 at 12:22:18PM -0500, Mario Limonciello wrote:

> At that time rt286 I2S wasn't even in the kernel.  Bard didn't start 
> to land it until later that year 
> (https://github.com/torvalds/linux/commit/07cf7cbadb4d97a78be61119a406de8fe446467e). 
> Was it really that crazy to plan Linux to take HDA mode?

Since we don't expose any way for the platform to detect that it's 
running Linux, yes.

> I would like to respectfully ask that this patch not be added to older 
> stable kernel versions.  It will knowingly cause a regression with 
> hardware in the field.  If this isn't an appropriate criteria for 
> avoiding to backport a patch to stable, what is?

Will it? You haven't shipped the firmware that changes this behaviour 
yet.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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