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    SubjectRe: Proposal: Eliminate GFP_DMA
    >> > > 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.

    If we're going to really sort this out, would be nice to just pass an upper
    bound for an address to __alloc_pages, instead of a simple bitmask ;-)

    M.

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