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    SubjectRe: locking hierarchy based on lockdep
     > i like your idea of using lockdep to document locking hierarchies.

    Yes, it's definitely a cool idea. I think the current implementation
    is not that useful, since it jams all the unrelated kernel locks into
    a single ordered list, when in fact many locks simply have no ordering
    relationship at all because they're never both taken. This makes the
    list hard to read and in fact loses the information of which locks
    have been taken together.

    - R.
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