Re: [PATCH] nohz: Remove tick_nohz_idle_enter_norcu() /tick_nohz_idle_exit_norcu()

[Paul E. McKenney]

On Mon, Nov 21, 2011 at 04:23:51PM +0100, Frederic Weisbecker wrote:
> On Sun, Nov 20, 2011 at 09:28:19PM -0800, Paul E. McKenney wrote:
> > On Mon, Nov 21, 2011 at 02:46:58AM +0100, Frederic Weisbecker wrote:
> > > 2011/11/19 Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx>:
> > > > On Thu, Nov 17, 2011 at 05:03:44PM -0800, Paul E. McKenney wrote:
> > > >> On Thu, Nov 17, 2011 at 12:11:34PM -0800, Josh Triplett wrote:

[ . . . ]

> > 4.	Task A invokes a system call.  If the system-call entry
> > 	code were to again invoke rcu_idle_enter(), then my patch
> > 	is required.  If you check and avoid invoking rcu_idle_enter()
> > 	in this case, then my patch is not required.
> 
> You mean rcu_idle_exit()? So yeah, since we have the tick running
> and thus RCU not in extended QS, we won't call rcu_idle_exit() on syscall
> entry.

OK, then I will drop my patch.  ;-)

							Thanx, Paul

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