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SubjectRe: Proposal: Eliminate GFP_DMA
On Fri, Feb 28, 2003 at 03:56:15PM +0100, 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 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.

That's a bit broken... I have an ALS4000 PCI soundcard that is a 24-bit
soundcard. pci_set_dma_mask should support 24-bits accordingly,
otherwise it's a bug in your platform implementation... Nobody will be
able to use certain properly-written drivers on your platform otherwise.

Jeff



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