linux-kernel - Re: linux-next-20110923: warning kernel/rcutree.c:1833

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Date:	Thu, 29 Sep 2011 16:18:28 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-kernel@...r.kernel.org, Dipankar Sarma <dipankar@...ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Lai Jiangshan <laijs@...fujitsu.com>
Subject: Re: linux-next-20110923: warning kernel/rcutree.c:1833

On Thu, Sep 29, 2011 at 10:19:01AM -0700, Paul E. McKenney wrote:
> On Thu, Sep 29, 2011 at 10:12:05AM -0700, Paul E. McKenney wrote:
> > On Thu, Sep 29, 2011 at 02:30:44PM +0200, Frederic Weisbecker wrote:
> 
> [ . . . ]
> 
> > > Sure I can take your patches (I'm going to merge the delta into the first).
> > > But if you want a rebase against -rc8, it's going to be easier if you
> > > do that rebase on the branch you want me to work on. Then I work on top
> > > of it.
> > > 
> > > For example we can take your rcu/dynticks, rewind to
> > > "rcu: Make synchronize_sched_expedited() better at work sharing"
> > > 771c326f20029a9f30b9a58237c9a5d5ddc1763d, rebase on top of -rc8
> > > and I rebase my patches (yours included) on top of it and I repost.
> > > 
> > > Right?
> > 
> > Yep!  Your earlier three patches look to need some extended-quiescent-state
> > rework as well:
> > 
> > b5566f3d: Detect illegal rcu dereference in extended quiescent state
> > ee05e5a4: Inform the user about dynticks-idle mode on PROVE_RCU warning
> > fa5d22cf: Warn when rcu_read_lock() is used in extended quiescent state
> > 
> > So I will leave these out and let you rebase them.
> 
> And for whatever it is worth, my following patches depend on yours as
> well, so will not include them in the rebase:
> 
> 61cf7640: Remove one layer of abstraction from PROVE_RCU checking
> 9a4d1ce3: Warn when srcu_read_lock() is used in an extended quiescent state

And the new stack passes moderate rcutorture testing, and is available
at https://github.com/paulmckrcu/linux on branch rcu/next.

							Thanx, Paul
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