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    SubjectRe: [GIT PATCH] UIO patches for 2.6.21
    On Fri, 27 Apr 2007 15:49:57 -0700
    Greg KH <> wrote:

    > Here are the updated UIO (Userspace I/O driver framework) patches for
    > 2.6.21.

    I'm a bit uncertain about the whole UIO idea, really. I have this vague
    feeling that we'd prefer to encourage people to move device drivers into
    GPL'ed kernel rather than encouraging them to do closed-source userspace
    implementations which will probably end up being slower, less reliable and
    unavailable on various architectures, distros, etc.

    But I don't think I have the capacity to actually think about this further
    - just tossing it out there ;)

    > They have been revamped from the last time you have seen them, and they
    > include a real driver, the Hilscher CIF DeviceNet and Profibus card
    > controller, which is being used in production systems with this driver
    > framework right now. The kernel driver they replaced was a total mess,
    > with over 60+ ioctls to try to control the different aspects of the
    > device. See the last patch in this series for more details on this
    > driver.
    > These patches include full documentation, are self-contained from the
    > rest of the kernel, and have been in the -mm tree for the past few
    > months with no complaints.
    > Please pull from:
    > Patches will be sent as a follow-on to this message to lkml for people
    > to see.
    > drivers/uio/uio_cif.c | 156 ++++++++

    eh? How come a particular device requires 156 lines of kernel code to
    support a userspace driver? Doesn't that kind of defeat the point?

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