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From: Mark Lord <liml@rtr.ca>
To: benh@kernel.crashing.org
Cc: Jeff Garzik <jgarzik@pobox.com>, Tejun Heo <htejun@gmail.com>,
	Alan Cox <alan@redhat.com>,
	James Bottomley <James.Bottomley@HansenPartnership.com>,
	IDE/ATA development list <linux-ide@vger.kernel.org>
Subject: Re: libata .sg_tablesize: why always dividing by 2 ?
Date: Mon, 25 Feb 2008 20:43:31 -0500	[thread overview]
Message-ID: <47C36EC3.4080708@rtr.ca> (raw)
In-Reply-To: <47C36D64.6010001@rtr.ca>

Mark Lord wrote:
> Benjamin Herrenschmidt wrote:
..
>> The split wasn't done by the iommu. The split was done by the IDE code
>> itself to handle the stupid 64k crossing thingy. If it's done
>> differently now, it might be possible to remove it, I haven't looked.
> ..
> 
> The block layer uses seg_boundary_mask to ensure that we never have
> to split them again in the LLD.
..

James B.  suggests that we stick a WARN_ON() into libata to let us
know if that precondition is violated.  Sounds like an easy thing to do
for a couple of -rc cycles someday.

Cheers

  reply	other threads:[~2008-02-26  1:40 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-26  0:02 libata .sg_tablesize: why always dividing by 2 ? Mark Lord
2008-02-26  0:15 ` Jeff Garzik
2008-02-26  0:27   ` Mark Lord
2008-02-26  0:54   ` Benjamin Herrenschmidt
2008-02-26  1:37     ` Mark Lord
2008-02-26  1:43       ` Mark Lord [this message]
2008-02-26  2:54         ` Benjamin Herrenschmidt
2008-02-26  4:38           ` Mark Lord
2008-02-26  5:30             ` Benjamin Herrenschmidt
2008-02-26  5:43               ` Mark Lord
2008-02-26  5:47                 ` Benjamin Herrenschmidt
2008-02-26 16:09                   ` James Bottomley
2008-02-26 21:43                     ` Benjamin Herrenschmidt
2008-02-26 16:25                   ` Mark Lord
2008-02-26 16:51                     ` Mark Lord
2008-02-26 21:50                       ` Benjamin Herrenschmidt
2008-02-26 21:56                         ` James Bottomley
2008-02-26 22:30                           ` Benjamin Herrenschmidt
2008-02-26 23:16                             ` Benjamin Herrenschmidt
2008-02-26 21:43                     ` Benjamin Herrenschmidt
2008-02-26 23:07                       ` Alan Cox
2008-02-26 23:19                         ` Benjamin Herrenschmidt
2008-02-28  7:36                           ` FUJITA Tomonori
2008-02-28  7:44                             ` Benjamin Herrenschmidt
2008-02-26  2:52       ` Benjamin Herrenschmidt
2008-02-26  0:22 ` Jeff Garzik
2008-02-26  0:28   ` Mark Lord

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