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    SubjectRe: linux-next-20110923: warning kernel/rcutree.c:1833
    From
    2011/10/1 Frederic Weisbecker <fweisbec@gmail.com>:
    > Yeah something like this (untested):
    >
    > diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
    > index d5097c4..ad3ecad 100644
    > --- a/kernel/time/tick-sched.c
    > +++ b/kernel/time/tick-sched.c
    > @@ -273,9 +273,12 @@ void tick_nohz_stop_sched_tick(int inidle)
    >         * updated. Thus, it must not be called in the event we are called from
    >         * irq_exit() with the prior state different than idle.
    >         */
    > -       if (!inidle && !ts->inidle)
    > +       if (inidle)
    > +               rcu_idle_enter();
    > +       else if (!ts->inidle)
    >                goto end;
    >
    > +
    >        /*
    >         * Set ts->inidle unconditionally. Even if the system did not
    >         * switch to NOHZ mode the cpu frequency governers rely on the
    > @@ -409,7 +412,6 @@ void tick_nohz_stop_sched_tick(int inidle)
    >                        ts->idle_tick = hrtimer_get_expires(&ts->sched_timer);
    >                        ts->tick_stopped = 1;
    >                        ts->idle_jiffies = last_jiffies;
    > -                       rcu_enter_nohz();
    >                }
    >
    >                ts->idle_sleeps++;
    > @@ -505,6 +507,9 @@ void tick_nohz_restart_sched_tick(void)
    >        ktime_t now;
    >
    >        local_irq_disable();
    > +
    > +       rcu_idle_exit();
    > +
    >        if (ts->idle_active || (ts->inidle && ts->tick_stopped))
    >                now = ktime_get();
    >
    > @@ -519,8 +524,6 @@ void tick_nohz_restart_sched_tick(void)
    >
    >        ts->inidle = 0;
    >
    > -       rcu_exit_nohz();
    > -
    >        /* Update jiffies first */
    >        select_nohz_load_balancer(0);
    >        tick_do_update_jiffies64(now);
    >

    Ah I see you fixed it in the delta. Ok :)
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