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Subject: Re: Proposal: Eliminate GFP_DMA
From: Arjan van de Ven <arjanv@redhat.com>
Reply-To: arjanv@redhat.com
To: Andi Kleen <ak@suse.de>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, Matthew Wilcox <willy@debian.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
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On Fri, 2003-02-28 at 15:56, Andi Kleen wrote:
> On Fri, Feb 28, 2003 at 03:55:37PM +0000, Alan Cox wrote:
> > On Fri, 2003-02-28 at 14:34, Matthew Wilcox wrote:
> > > umm.  are you volunteering to convert drivers/net/macmace.c to the pc=
i_*
> > > API then?  also, GFP_DMA is used on, eg, s390 to get memory below 2GB=
 and
> > > on ia64 to get memory below 4GB.
> >=20
> > The ia64 is a fine example of how broken it is. People have to hack aro=
und=20
> > with GFP_DMA meaning different things on ia64 to everything else. It ne=
eds
> > to die.=20
>=20
> At least on x86-64 it is still needed when you need have some hardware
> with address limits < 4GB (e.g. an 24bit soundcard)
>=20
> pci_* on K8 only allows address mask 0xffffffff or unlimited.

for 2.7 the underlying low level budy allocator could (should?) just
take a DMA bitmask

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