linux-kernel - Re: [PATCH v2] fix sign extension with 1.5TB usb-storage LBD=y

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Date:	Wed, 22 Apr 2009 05:09:21 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	mdharm-usb@...-eyed-alien.net,
	linux-usb <linux-usb@...r.kernel.org>,
	usb-storage@...ts.one-eyed-alien.net,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH v2] fix sign extension with 1.5TB usb-storage LBD=y

On Wed, Apr 22, 2009 at 10:32:59AM +0300, Boaz Harrosh wrote:
> These are actually aligned access it might be worth sacrificing a cast
> to be32/64 for sake of speed.

"for sake of speed"?  How often do you think we ask a device how large
it is?  How much overhead do you think is incurred by the unaligned code
if the data happens to be aligned?

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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