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    SubjectRe: [PATCH 2.6.19-rc1-mm1] Export jiffies_to_timespec()
    On Wed, Oct 11, 2006 at 11:17:39AM -0700, Andrew Morton wrote:
    > On Wed, 11 Oct 2006 17:16:28 +0100
    > Christoph Hellwig <> wrote:
    > > On Tue, Oct 10, 2006 at 05:36:54PM -0700, Jeremy Fitzhardinge wrote:
    > > > Export jiffies_to_timespec; previously modules used the inlined header
    > > > version.
    > >
    > > NACK, drivers shouldn know about these timekeeping details and no
    > > in-tree driver uses it (fortunately)
    > Disagree.
    > a) `jiffies' and `timepsec' are hardly "details". They are basic
    > kernel-wide concepts. timespecs are even known to userspace. Exporting
    > a helper function which converts from one to the other is perfectly
    > reasonable.

    That non one in tree ever uses it is a very good reason no to export it
    either. While there are still far too many direct jiffy users there
    is no one directly convertin it to a timespec for good reason.

    > b) jiffies_to_timespec() was previously available to modules. We
    > changed that without notice and we changed it *by accident*. There was
    > no intention to withdraw jiffies_to_timespec() from the
    > available-to-modules API.

    By that rationale everything errornously implemented as a macro or inline
    at some point will need to be exported. Except for you we still maintain
    that we don't want to keep unused exports. Arjan even put a formal mechanism
    in to warn about them and has gotten a global buy-in to kill them. This
    will fall under this ASAP and only give people a short period to keep using
    it. Not a very useful message.

    (especially when the only user is closed source crap where people should
    help the proper reverse-engineered driver instead)

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