linux-kernel - Re: [PATCHv2] rcu: tree: correctly handle sparse possible CPUs

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Message-ID: <20160518184155.GB3528@linux.vnet.ibm.com>
Date:	Wed, 18 May 2016 11:41:55 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Arnd Bergmann <arnd@...db.de>, catalin.marinas@....com,
	dennis.chen@....com, jiangshanlai@...il.com, josh@...htriplett.org,
	linux-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
	rostedt@...dmis.org, steve.capper@....com, will.deacon@....com
Subject: Re: [PATCHv2] rcu: tree: correctly handle sparse possible CPUs

On Wed, May 18, 2016 at 07:15:09PM +0100, Mark Rutland wrote:
> On Wed, May 18, 2016 at 02:02:36PM +0200, Arnd Bergmann wrote:
> > It's the missing "possible_" that Mark mentioned in his reply on Friday.
> 
> Actually, that was this morning. My VM on my laptop had a stale date due to
> suspend/resume of the host. :/
> 
> I should be back at a real computer by Friday, and can respin the patch to fix
> the issue Andrey pointed out.
> 
> Thanks for the fixup, and sorry for the confusion!
> 
> Mark.
> 
> > Please fold the fixup below into the patch if you want to get it to build.
> > 
> > Signed-off-by: Arnd Bergmann <arnd@...db.de

Thank you both!

Looking forward to the respin that covers the various issues that have
been located.

							Thanx, Paul

> > diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
> > index fd6b0f701bed..bb137b0ef6f3 100644
> > --- a/kernel/rcu/tree_plugin.h
> > +++ b/kernel/rcu/tree_plugin.h
> > @@ -1165,7 +1165,7 @@ static void rcu_boost_kthread_setaffinity(struct rcu_node *rnp, int outgoingcpu)
> >  		return;
> >  	if (!zalloc_cpumask_var(&cm, GFP_KERNEL))
> >  		return;
> > -	for_each_leaf_node_cpu_bit(rnp, cpu, bit)
> > +	for_each_leaf_node_possible_cpu_bit(rnp, cpu, bit)
> >  		if ((mask & bit) && cpu != outgoingcpu)
> >  			cpumask_set_cpu(cpu, cm);
> >  	if (cpumask_weight(cm) == 0)
> > 
>