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    SubjectRe: [PATCH mm] sysfs: add /sys/dev/usb to handle CONFIG_USB_DEVICE_CLASS=y
    On Thu, Apr 17, 2008 at 8:21 PM, Greg KH <> wrote:
    > On Thu, Apr 17, 2008 at 07:11:03PM -0700, Dan Williams wrote:
    > > The deprecated config option CONFIG_USB_DEVICE_CLASS causes class devices
    > > with duplicate major:minor numbers to be registered. In effect they
    > > represent a usb specific address space for major:minor numbers so add 'usb'
    > > as a directory along side 'block' and 'char'.
    > Hm, no they do not, they are not a new address space, we are just
    > reusing them as the other user wasn't using them, and the code is
    > deprecated and will be removed eventually. Neither of these char
    > devices are really hooked up to anything within the kernel, so it
    > doesn't matter yet.
    > I wonder how many other duplicates we have floating around...

    Hm, so how about making this an opt-in capability of the class? At
    device_add() time the class is queried to see if a link should be
    created in /sys/dev/block or /sys/dev/char? Although, this leads to
    inconsistent coverage. But maybe that does not matter as many of
    these character devices do not have interesting attributes to be
    accessed? Sigh, I am beginning to wonder if the character device side
    of this capability is a solution looking for a problem...


    > thanks,
    > greg k-h


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