linux-kernel - Re: [Intel IOMMU 01/10] DMAR detection and parsing logic

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Date:	Wed, 04 Jul 2007 12:14:58 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	linux-kernel@...r.kernel.org, ak@...e.de, gregkh@...e.de,
	muli@...ibm.com, suresh.b.siddha@...el.com, arjan@...ux.intel.com,
	ashok.raj@...el.com, davem@...emloft.net, clameter@....com
Subject: Re: [Intel IOMMU 01/10] DMAR detection and parsing logic

On Wed, 2007-07-04 at 03:04 -0700, Andrew Morton wrote:
> On Wed, 04 Jul 2007 11:18:56 +0200 Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Tue, 2007-06-19 at 14:37 -0700, Keshavamurthy, Anil S wrote:
> > > plain text document attachment (dmar_detection.patch)
> > 
> > > +/**
> > > + * parse_dmar_table - parses the DMA reporting table
> > > + */
> > > +static int __init
> > > +parse_dmar_table(void)
> > > +{
> > > +	struct acpi_table_dmar *dmar;
> > > +	struct acpi_dmar_header *entry_header;
> > > +	int ret = 0;
> > > +
> > > +	dmar = (struct acpi_table_dmar *)dmar_tbl;
> > > +
> > > +	if (!dmar->width) {
> >           ^^^^^^^^^^^^^^^^^^^
> > 
> > That goes *splat* on my opteron box.
> 
> This?
> 
> From: "Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
> 
> Check for dmar_tbl pointer as this can be NULL on systems with no Intel
> VT-d support.
> 
> Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>

Ah, that does look sane, I'll test it whenever the next -mm comes
around.

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