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    Subject[PATCH 6/8] rcu: call rcu_read_unlock_special() in rcu_preempt_check_callbacks()
    Date
    if rcu_read_unlock_special() is deferred, we can invoke it earlier
    in the schedule-tick.

    Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
    ---
    kernel/rcutree_plugin.h | 5 ++++-
    1 files changed, 4 insertions(+), 1 deletions(-)

    diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
    index 997b424..c9ff9f1 100644
    --- a/kernel/rcutree_plugin.h
    +++ b/kernel/rcutree_plugin.h
    @@ -684,8 +684,11 @@ static void rcu_preempt_check_callbacks(int cpu)
    {
    struct task_struct *t = current;

    - if (t->rcu_read_lock_nesting == 0) {
    + if (t->rcu_read_lock_nesting == 0 ||
    + t->rcu_read_lock_nesting == INT_MIN) {
    rcu_preempt_qs(cpu);
    + if (t->rcu_read_unlock_special)
    + rcu_read_unlock_special(t, false);
    return;
    }
    if (t->rcu_read_lock_nesting > 0 &&
    --
    1.7.4.4


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