linux-kernel - Re: RCU idle CPU detection is broken in linux-next

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Message-ID: <20120923002105.GA1112@linux.vnet.ibm.com>
Date:	Sat, 22 Sep 2012 17:21:05 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Michael Wang <wangyun@...ux.vnet.ibm.com>,
	Dave Jones <davej@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	fweisbec@...il.com
Subject: Re: RCU idle CPU detection is broken in linux-next

On Sat, Sep 22, 2012 at 02:27:35PM -0700, Paul E. McKenney wrote:
> On Sat, Sep 22, 2012 at 07:50:29PM +0200, Sasha Levin wrote:
> > On 09/22/2012 05:56 PM, Paul E. McKenney wrote:
> > > And now the prime suspect is the new CONFIG_RCU_USER_QS=y.  Do these
> > > warnings ever show up with CONFIG_RCU_USER_QS=n?
> > 
> > It seems that disabling that does make the warnings go away.
> > 
> > I'll keep the tests running in case it just reduces the chances or something
> > like that.
> 
> Thank you for testing this!
> 
> And of course the reason that I didn't see these problems is that I
> failed to update my tests to enable CONFIG_RCU_USER_QS.  :-/

Also the fact that I run 32-bit guests on x86.  Sigh!

I take it that you are running 64-bit guests?

							Thanx, Paul

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