linux-kernel - Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123 native_smp_send

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Date:	Wed, 15 May 2013 16:55:13 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tony Luck <tony.luck@...el.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org
Subject: Re: NOHZ: WARNING: at arch/x86/kernel/smp.c:123
 native_smp_send_reschedule

On Thu, May 16, 2013 at 12:43:58AM +0200, Borislav Petkov wrote:
> On Wed, May 15, 2013 at 11:45:28AM -0700, Paul E. McKenney wrote:
> > Does the following patch help?
> 
> Hmm, I just tried on 3.10-rc1
> 
> CONFIG_NO_HZ_FULL_ALL=y
> 
> on the one hand and then
> 
> CONFIG_NO_HZ_FULL=y
> # CONFIG_NO_HZ_FULL_ALL is not set
> 
> with "nohz_full=4-7 rcu_nocbs=4-7" on the cmdline and I don't see the
> splats anymore.
> 
> Do I need to try something else?

I never saw the problem, so I have to defer to you on this one.  I will
hold off on the patch unless the problem shows up again.

							Thanx, Paul

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