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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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