linux-kernel - Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28

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Date:	Mon, 28 Dec 2009 02:54:46 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Alain Knaff <alain@...ff.lu>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mark Hounschell <markh@...pro.net>,
	"Pallipadi, Venkatesh" <venkatesh.pallipadi@...el.com>,
	"dmarkh@....rr.com" <dmarkh@....rr.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"fdutils@...tils.linux.lu" <fdutils@...tils.linux.lu>,
	"Li, Shaohua" <shaohua.li@...el.com>, Ingo Molnar <mingo@...e.hu>,
	morgan@...sics.ucla.edu, JONES@...PLA.NPL.UIUC.EDU
Subject: Re: [Fdutils] DMA cache consistency bug introduced in 2.6.28

> disable_hlt/enable_hlt was only needed to work around a bug on TM4000
> (Texas Instrument) Laptops which were popular around 1994 / 1995.

I don't think we can fully drop support for these systems.

Did they have an unique PCI ID or something else that could be tested
for?

Perhaps it could be just a white list like dmi_year > 1995 to disable.

Depending on how often floppies are still used this might save
non trivial amounts of power on newer systems :)

Anyways it would be probably good to convert this to the new infrastructure,
and remove the old hooks, but the interrupt-context issue would
need to be fixed first.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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