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    SubjectRe: [BUG on PREEMPT_RT, 2.6.23.1-rt5] in rt-mutex code and signals
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    On Sat, 2007-11-17 at 10:12 -0800, Daniel Walker wrote:

    > What specifically is wrong with dev->sem ?

    Nothing really, other than that they use semaphores to avoid lockdep :-/

    I think I know how to annotate this, after Alan Stern explained all the
    use cases, but I haven't come around to implementing it. Hope to do that
    soonish.

    Another real semaphore user is XFS, they really use the down/up
    asymmetry that semaphores allow, last time I spoke with Dave Chinner he
    didn't know a way around this.

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