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    SubjectRe: [PATCH 01/12] Use mutex instead of semaphore in driver core
    On Wed, 2 Jan 2008, Dave Young wrote:

    > > Around a month ago I had a discussion with Peter Zijlstra about the
    > > problems in converting the device semaphores to mutexes; you may be
    > > able to find it in the LKML archives. Doing the conversion while
    > > keeping lockdep happy is a very hard problem and we were not able to
    > > solve it.
    > >
    > It's unfortunate to know this, I will search and read your thread.

    Here's a pointer to that thread:

    Alan Stern

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