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    Subject[PATCH tip/core/rcu 0/3] increase rcutorture intensity and fix a couple resulting bugs
    This patch series increases the intensity of rcutorture testing for
    TREE_PREEMPT_RCU and provides fixes for a couple resulting bugs.

    o Make rcutorture's RCU read-side critical sections occasionally
    spin for a few tens of milliseconds, which greatly increases
    the probability that they will be preempted and that quiescent
    states will be forced. Yes, this does uncover some bugs in
    TREE_PREEMPT_RCU (though TREE_RCU passes with flying colors).

    o Fix a bug where rnp->gpnum was not being updated. This
    increases TREE_PREEMPT_RCU's reliability considerably, though
    bugs still remain.

    o Make the initialization of multi-node trees of rcu_node
    structures unconditionally acquire rnp->lock. This simplifies
    the code a bit and will make it easier to allow grace-period
    initialization become preemptable, should this be needed.

    Next steps include applying review comments, adding expedited grace
    periods, and chasing down remaining bugs. Longer term, RCU priority
    boosting.

    b/kernel/rcutorture.c | 16 +++++++++-------
    b/kernel/rcutree.c | 7 +++++--
    kernel/rcutree.c | 42 ++++++++++++------------------------------
    3 files changed, 26 insertions(+), 39 deletions(-)


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