linux-kernel - Re: [PATCH V3] VIA IRQ quirk behaviour change

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Date:	Sun, 10 Sep 2006 22:34:40 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	Lee Revell <rlrevell@...-job.com>
Cc:	Greg KH <greg@...ah.com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Daniel Drake <dsd@...too.org>, akpm@...l.org,
	torvalds@...l.org, sergio@...giomb.no-ip.org, jeff@...zik.org,
	cw@...f.org, bjorn.helgaas@...com, linux-kernel@...r.kernel.org,
	harmon@....edu, len.brown@...el.com, vsu@...linux.ru,
	liste@...det.net
Subject: Re: [PATCH V3] VIA IRQ quirk behaviour change

On Sun, Sep 10, 2006 at 05:30:18PM -0400, Lee Revell wrote:

> Sorry, all I have is anecdotal evidence.  The scope of the problem isn't
> fully known.  Could be related to vendors implementing ACPI using SMM.
> Vendors are tight lipped about which hardware is affected because it
> understandably annoys users.

I don't know what you really mean by "implementing ACPI" here. Certain 
queries may generate SMM traps, but I haven't seen any event driven code 
paths that do[1]. If you're polling hardware you may generate some 
latency, but I don't think that's any great surprise.

It would be interesting to have a test case under Linux so we could 
attempt to figure out whether it's an actual problem, or just Windows 
doing awkward things.

[1] outside sort of obvious stuff like ripping out a hotswap bay and 
/potentially/ critical battery status to switch on a warning light, but 
if you hit those situations you're probably pretty much dead anyway

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