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SubjectRe: rcu_dyntick and suspicious RCU usage
On Thu, Jul 12, 2012 at 09:43:08AM -0700, Paul E. McKenney wrote:
> On Wed, Jul 11, 2012 at 12:49:24AM -0700, Paul E. McKenney wrote:
> > On Tue, Jul 10, 2012 at 12:47:00PM +0800, Fengguang Wu wrote:
> > > Hi Paul,
> > >
> > > Fortunately this bug is bisectable and the first bad commit is:
> > >
> > > commit 9b2e4f1880b789be1f24f9684f7a54b90310b5c0
> > > Author: Paul E. McKenney <paul.mckenney@linaro.org>
> > > Date: Fri Sep 30 12:10:22 2011 -0700
> > >
> > > rcu: Track idleness independent of idle tasks
> >
> > OK, there is a problem in TINY_RCU's handling of dyntick-idle: it
> > traces while in idle. The confusion on my part was that in TREE_RCU,
> > the nesting and dyntick-idle indication are different, while in
> > TINY_RCU they are one and the same.
> >
> > Does the following patch help?
>
> This one failed in my testing. Please see the end for the fixed
> version, with on small but important change.

It worked, thanks!

Tested-by: Fengguang Wu <wfg@linux.intel.com>



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