Re: linux-next 20111025: warnings inrcu_idle_exit_common()/rcu_idle_enter_common()

[Paul E. McKenney]

On Wed, Nov 02, 2011 at 10:56:26AM -0400, Steven Rostedt wrote:
> On Wed, 2011-11-02 at 07:44 -0700, Paul E. McKenney wrote:
> 
> > rcu: Fix idle-task checks
> > 
> > RCU has traditionally relied on idle_cpu() to determine whether a given
> > CPU is running in the context of an idle task, but recent changes have
> > invalidated this approach.
> 
> Correct. idle_cpu() returns if the CPU is idle or not, not if the CPU is
> running the idle thread. If the CPU wakes up on the idle thread and
> there's tasks on the run queue, then idle_cpu() will return false, even
> though the task running is the idle thread. But the CPU itself is not
> technically idle.
> 
> Acked-by: Steven Rostedt <rostedt@xxxxxxxxxxx>

Thank you, Steven!  I have added your Acked-by.

							Thanx, Paul

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/