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Date: Fri, 28 Feb 2003 15:56:15 +0100
From: Andi Kleen <ak@suse.de>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Matthew Wilcox <willy@debian.org>, Andi Kleen <ak@suse.de>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Proposal: Eliminate GFP_DMA
Message-ID: <20030228145614.GA27798@wotan.suse.de>
References: <20030228064631.G23865@parcelfarce.linux.theplanet.co.uk.suse.lists.linux.kernel> <p73heao7ph2.fsf@amdsimf.suse.de> <20030228141234.H23865@parcelfarce.linux.theplanet.co.uk> <1046445897.16599.60.camel@irongate.swansea.linux.org.uk> <20030228143405.I23865@parcelfarce.linux.theplanet.co.uk> <1046447737.16599.83.camel@irongate.swansea.linux.org.uk>
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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 pci_*
> > API then?  also, GFP_DMA is used on, eg, s390 to get memory below 2GB and
> > on ia64 to get memory below 4GB.
> 
> The ia64 is a fine example of how broken it is. People have to hack around 
> with GFP_DMA meaning different things on ia64 to everything else. It needs
> to die. 

At least on x86-64 it is still needed when you need have some hardware
with address limits < 4GB (e.g. an 24bit soundcard)

pci_* on K8 only allows address mask 0xffffffff or unlimited.

-Andi
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