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From: Andi Kleen <ak@suse.de>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: davem@redhat.com, alan@lxorguk.ukuu.org.uk,
	grundler@parisc-linux.org, James.Bottomley@SteelEye.com,
	axboe@suse.de, suparna@in.ibm.com, linux-kernel@vger.kernel.org,
	alex_williamson@hp.com, bjorn_helgaas@hp.com
Subject: Re: [RFC] block layer support for DMA IOMMU bypass mode II
Date: Tue, 8 Jul 2003 22:10:41 +0200	[thread overview]
Message-ID: <20030708221041.740d4ca3.ak@suse.de> (raw)
In-Reply-To: <20030708194744.GD17115@gtf.org>

On Tue, 8 Jul 2003 15:47:44 -0400
Jeff Garzik <jgarzik@pobox.com> wrote:

> Personally, I've always thought we were kidding ourselves by not doing
> the error checking you describe.  From my somewhat-narrow perspective of
> network drivers and the libata storage driver, you have to deal with
> atomic allocations _anyway_ ...  so why not make sure IOMMU overflow
> properly fails at the pci_map_foo level?

pci_map_single currently has no defined error return, but if you could 
persuade all your drivers colleagues to fix their drivers to check
this I'm sure things would be better.

(on AMD64 the check could be trivially implemented as a macro because errors
always return a well defined address)

-Andi

  reply	other threads:[~2003-07-08 19:57 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-07-01 16:46 [RFC] block layer support for DMA IOMMU bypass mode James Bottomley
2003-07-01 17:09 ` Andi Kleen
2003-07-01 17:28   ` James Bottomley
2003-07-01 17:42     ` Andi Kleen
2003-07-01 19:22       ` Grant Grundler
2003-07-01 19:56       ` James Bottomley
2003-07-01 17:54     ` H. Peter Anvin
2003-07-01 19:19 ` Grant Grundler
2003-07-01 19:59   ` Alex Williamson
2003-07-01 20:11     ` James Bottomley
2003-07-01 20:03   ` James Bottomley
2003-07-01 23:01     ` Grant Grundler
2003-07-02 15:52       ` James Bottomley
2003-07-01 22:51 ` David S. Miller
2003-07-01 23:57 ` [RFC] block layer support for DMA IOMMU bypass mode II Andi Kleen
2003-07-02  0:03   ` David S. Miller
2003-07-02  0:22     ` Andi Kleen
2003-07-02  0:21       ` David S. Miller
2003-07-02 16:53       ` Grant Grundler
2003-07-02 17:19         ` Andi Kleen
2003-07-02 16:55   ` Grant Grundler
2003-07-02 17:20     ` Andi Kleen
2003-07-02 17:37       ` Grant Grundler
2003-07-02 21:16     ` Alan Cox
2003-07-02 23:56       ` Andi Kleen
2003-07-03 20:26         ` Alan Cox
2003-07-03 21:24           ` Andi Kleen
2003-07-03 22:19             ` Grant Grundler
2003-07-08  2:14             ` David S. Miller
2003-07-08 19:34               ` Andi Kleen
2003-07-08 19:47                 ` Jeff Garzik
2003-07-08 20:10                   ` Andi Kleen [this message]
2003-07-08 20:11                   ` Grant Grundler
2003-07-08 22:04                 ` David S. Miller
2003-07-08 22:25                   ` Grant Grundler
2003-07-08 22:23                     ` David S. Miller
2003-07-09 18:55                       ` Andi Kleen
2003-07-23 11:40                       ` Grant Grundler
2003-07-28 11:15                         ` Andi Kleen
2003-07-28 14:59                           ` Grant Grundler
2003-07-30  2:31                           ` Grant Grundler
2003-08-01 21:51                             ` Cliff White
2003-08-01 23:18                               ` reaim now available as osdl-aim-7 - " Cliff White
2003-07-30  4:42                           ` Grant Grundler
2003-07-30  4:51                             ` David S. Miller
2003-07-30 13:06                               ` Grant Grundler
2003-07-30 16:02                               ` Grant Grundler
2003-07-30 16:36                                 ` Andi Kleen
2003-07-30 17:18                                   ` James Bottomley
2003-07-30 14:20                             ` James Bottomley
2003-07-23 13:20                       ` Grant Grundler
2003-07-23 15:30                         ` Jens Axboe

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