From: Robert Hancock <hancockr@shaw.ca>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Marco Gatti <marco@pianoinflames.de>,
Jens Axboe <jens.axboe@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
IDE/ATA development list <linux-ide@vger.kernel.org>,
Greg KH <greg@kroah.com>, Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@elte.hu>, Jeff Garzik <jgarzik@pobox.com>
Subject: Re: Bug: get EXT3-fs error Allocating block in system zone
Date: Mon, 10 Dec 2007 17:59:39 -0600 [thread overview]
Message-ID: <475DD2EB.8030606@shaw.ca> (raw)
In-Reply-To: <alpine.LFD.0.9999.0712101009410.28293@woody.linux-foundation.org>
Linus Torvalds wrote:
>
> On Mon, 10 Dec 2007, Marco Gatti wrote:
>> I didn't compile completly.
>>
>> drivers/scsi/scsi_lib.c:1565:1: error: unterminated #else
>
> Heh. That #else should be an #endif, of course.
>
> It is a bit strange that it still tries to do IO to high memory. Either
> the whole "64 bit capability" thing in AHCI is broken, or the bounce
> buffering doesn't work right. Or maybe you tried the "iommu=off" without
> the original patch that tried to turn off 64-bit DMA?
>
> Linus
>
From what I can see, it appears that iommu=off disables the IOMMU but
doesn't actually do anything to prevent attempts to DMA above 4GB. If
you try to map something over 4GB it just chokes with that mask overflow
(in arch/x86/kernel/pci-nommu_64.c).
The iommu=off option actually seems rather useless, as it's the default
in the only case where it will actually work (no memory above 4GB)..
--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@nospamshaw.ca
Home Page: http://www.roberthancock.com/
next prev parent reply other threads:[~2007-12-11 0:00 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.Fg53DJSEh/kZhf/uRCv9FYZsaSQ@ifi.uio.no>
[not found] ` <fa.nPzIjJ2SchPb1LOa/dRWb/WyEZU@ifi.uio.no>
[not found] ` <fa.LkmHGN+Fx6H930bfeCDU6pGdBKM@ifi.uio.no>
[not found] ` <fa.oSqMiIX7WubypXrhZGaRKU5wNGU@ifi.uio.no>
[not found] ` <fa.0pc9/nNmTq+eWIU9rADRn0xYGdI@ifi.uio.no>
[not found] ` <fa.hqM73i24f6G31R5F3sKL8+3H8Ww@ifi.uio.no>
[not found] ` <475C2C02.70001@shaw.ca>
2007-12-09 18:59 ` Bug: get EXT3-fs error Allocating block in system zone Linus Torvalds
2007-12-09 19:09 ` Jens Axboe
2007-12-09 19:58 ` Marco Gatti
2007-12-09 20:04 ` Jens Axboe
[not found] ` <475C536B.5070409@pianoinflames.de>
2007-12-09 21:01 ` Jens Axboe
2007-12-10 18:01 ` Marco Gatti
2007-12-10 18:08 ` Jens Axboe
2007-12-10 18:11 ` Linus Torvalds
2007-12-10 23:59 ` Robert Hancock [this message]
2008-01-31 18:46 ` Marco Gatti
2007-12-18 8:36 ` Marco Gatti
2007-12-10 16:38 ` Mark Lord
2007-12-10 17:47 ` Marco Gatti
2007-12-19 21:25 ` Marco Gatti
2007-12-19 21:27 ` Alan Cox
[not found] <4755BEA1.4090604@pianoinflames.de>
[not found] ` <20071206162500.1f76a234.akpm@linux-foundation.org>
[not found] ` <alpine.LFD.0.9999.0712061631510.13796@woody.linux-foundation.org>
[not found] ` <475B0AD7.10500@pianoinflames.de>
[not found] ` <alpine.LFD.0.9999.0712081644560.12046@woody.linux-foundation.org>
[not found] ` <475C1F06.4080508@pianoinflames.de>
2007-12-09 18:56 ` Linus Torvalds
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