From: Christoph Hellwig <hch@lst.de>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Olof Johansson <olof@lixom.net>,
linuxppc-dev@ozlabs.org, paulus@samba.org
Subject: Re: [PATCH] DMA 4GB boundary protection
Date: Sun, 4 Mar 2007 06:17:38 +0100 [thread overview]
Message-ID: <20070304051738.GA30747@lst.de> (raw)
In-Reply-To: <1172910451.8184.51.camel@localhost.localdomain>
On Sat, Mar 03, 2007 at 09:27:31AM +0100, Benjamin Herrenschmidt wrote:
> - Drivers are broken -today- and I doubt they can all be audited and
> fixed (and fixes bacported to distros) quickly
Which drivers? All requests coming from the block layer make sure
you never span the 4GB boundary, and IIRC that same is true for
networking. Similarly dma_alloc_coherent and pci_alloc_consinstant
only allocate from the lower 4G unless told otherwise. A driver writer
would have to be extra-ordinarily stuid to get this wrong. (And yes,
some driver writers are..)
next prev parent reply other threads:[~2007-03-04 5:17 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-02 21:49 [PATCH] DMA 4GB boundary protection Jake Moilanen
2007-03-02 22:27 ` Olof Johansson
2007-03-03 8:27 ` Benjamin Herrenschmidt
2007-03-03 23:25 ` Olof Johansson
2007-03-04 5:17 ` Christoph Hellwig [this message]
2007-03-04 5:52 ` Olof Johansson
2007-03-03 23:29 ` Olof Johansson
2007-03-03 23:32 ` Segher Boessenkool
2007-03-03 23:57 ` Olof Johansson
2007-03-21 21:05 ` Jake Moilanen
2007-03-21 21:39 ` Olof Johansson
2007-03-22 17:53 ` Olof Johansson
2007-03-22 17:47 ` Jake Moilanen
2007-03-22 22:52 ` Segher Boessenkool
2007-03-27 20:10 ` Jake Moilanen
2007-03-27 20:55 ` Benjamin Herrenschmidt
2007-03-27 23:48 ` Paul Mackerras
2007-03-28 15:56 ` Olof Johansson
2007-03-28 18:17 ` Jake Moilanen
2007-03-28 23:23 ` Benjamin Herrenschmidt
2007-03-29 13:44 ` Jake Moilanen
2007-03-29 14:52 ` Olof Johansson
2007-03-29 21:54 ` Benjamin Herrenschmidt
2007-04-23 12:22 ` Paul Mackerras
2007-04-24 3:07 ` Olof Johansson
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