From: David Woodhouse <dwmw2@infradead.org>
To: Luming Yu <luming.yu@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC patch] return early if all dmar HW unit ignored
Date: Tue, 04 Aug 2009 08:09:54 +0100 [thread overview]
Message-ID: <1249369794.9324.18.camel@macbook.infradead.org> (raw)
In-Reply-To: <3877989d0907310129p29dd5039p18563946b9be8099@mail.gmail.com>
On Fri, 2009-07-31 at 16:29 +0800, Luming Yu wrote:
> Hello list,
>
> When debugging an IOMMU problem, I noticed it should be much more safe
> to return early than late if all remapping HW unit are ignored.
> To figure out what device causes the iommu problem on my linux box:
> hp-compaq dc7800, I tried to mark all dmar HW
> unit ignored,but still got a lot of unxepcted dmar_fault. So I think
> the proposed patch make sense. The next step is to
> add a boot option to make dmar HW units selectable enable/disable individually.
Why were you seeing faults if all dmar units were ignored? Surely that
shouldn't happen?
This patch doesn't make a lot of sense on its own -- can you show what
you were intending to do as the 'next step'?
--
David Woodhouse Open Source Technology Centre
David.Woodhouse@intel.com Intel Corporation
next prev parent reply other threads:[~2009-08-04 7:09 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-31 8:29 Luming Yu
2009-08-04 7:09 ` David Woodhouse [this message]
2009-08-10 6:21 ` Luming Yu
2009-08-10 9:13 ` David Woodhouse
2009-08-10 9:19 ` Luming Yu
2009-08-10 9:22 ` Luming Yu
2009-08-11 2:47 ` Luming Yu
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