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    SubjectRe: [linux-usb-devel] Re: SLAB vs. pci_alloc_xxx in usb-uhci patch [RFC: API]
    On Fri, Mar 09, 2001, David S. Miller <davem@redhat.com> wrote:
    > Manfred Spraul writes:
    > > Do lots of drivers need the reverse mapping? It wasn't on my todo list
    > > yet.
    >
    > I am against any API which provides this. It can be extremely
    > expensive to do this on some architectures, and since the rest
    > of the PCI dma API does not provide such an interface neither
    > should the pool routines.

    The API I hacked together for uhci.c didn't have this.

    > Drivers can keep track of this kind of information themselves,
    > and that is what I tell every driver author to do who complains
    > of a lack of a "bus_to_virt()" type thing, it's just lazy
    > programming.

    Once I worked around not having a "bus_to_virt()" type thing I was happier
    with the resulting code. I completely agree.

    JE

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