linux-kernel - Re: USB transfer_buffer allocations on 64bit systems

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Date:	Fri, 9 Apr 2010 15:34:06 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Pedro Ribeiro <pedrib@...il.com>
cc:	Daniel Mack <daniel@...aq.de>,
	Robert Hancock <hancockrwd@...il.com>,
	<linux-kernel@...r.kernel.org>, <akpm@...ux-foundation.org>,
	Greg KH <gregkh@...e.de>, <alsa-devel@...a-project.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: USB transfer_buffer allocations on 64bit systems

On Fri, 9 Apr 2010, Pedro Ribeiro wrote:

> > The DMA pointers do indeed look sane. I wanted to take a deeper look at
> > this and set up a 64bit system today. However, I fail to see the problem
> > here. Pedro, how much RAM does your machine have installed?

> It has 4 GB.

That means DMA mapping cannot be the cause of the problem.  :-(

Alan Stern

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