linux-kernel - Re: WARNING: at drivers/iommu/dmar.c:484 warn_invalid

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Date:	Tue, 9 Jul 2013 20:55:23 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	David Woodhouse <dwmw2@...radead.org>
Cc:	Chris Wright <chrisw@...s-sol.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"open list:INTEL IOMMU (VT-d)" <iommu@...ts.linux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: WARNING: at drivers/iommu/dmar.c:484 warn_invalid_dmar with
 Intel Motherboard

On Wed, Jul 10, 2013 at 01:53:15AM +0100, David Woodhouse wrote:
> On Tue, 2013-07-09 at 17:18 -0700, Guenter Roeck wrote:
> > 
> > I meant warning as in pr_warn or dev_warn, not WARNING as in traceback.
> > Keep in mind that a casual user doesn't expect to see a traceback and will tend
> > to get alarmed. Several bugs have been filed against this "issue" in various
> > distributions, which is not surprising given the alarmist message.
> > What is the point of that ?
> 
> It is warning you that your hardware is broken. Take it back to the
> place from which you purchased it, and ask for your money back if it
> isn't fixed.
> 
> (Slightly) more seriously, this level of warning *does* get things
> fixed, and when kerneloops was running it made it very easy to track
> this kind of issue and apply pressure where it was needed to improve
> quality.
> 
> Any user who has taken the trouble to file bugs has *also* taken it up
> with their firmware vendor, I hope?
> 
No idea ... but have you ever tried that as a private entity ?

If there is a secret list of people to contact at vendor X to get things
like this one fixed, please let me know ;).

Thanks,
Guenter
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