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    SubjectRe: [RFC][PATCH] identify in_dev_get rcu read-side critical sections
    On Wed, Sep 28, 2005 at 07:51:10AM -0700, Paul E. McKenney wrote:
    > The reference-count approach is only guaranteed to work if the kernel
    > thread that did the reference-count increment is later referencing that
    > same data element. Otherwise, one has the following possible situation
    > on DEC Alpha:

    You're quite right. Without the rcu_dereference users of in_dev_get()
    may see pre-initialisation contents of in_dev.

    So these barriers are definitely needed.

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