linux-kernel - Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu hotplug threads

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Message-ID: <alpine.LFD.2.02.1206132101440.3086@ionos>
Date:	Wed, 13 Jun 2012 21:02:55 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu
 hotplug threads

On Wed, 13 Jun 2012, Paul E. McKenney wrote:
> On Wed, Jun 13, 2012 at 11:00:54AM -0000, Thomas Gleixner wrote:
> >  	/* Now call notifier in preparation. */
> >  	cpu_notify(CPU_ONLINE | mod, hcpu);
> > +	smpboot_unpark_threads(cpu);
> 
> OK, RCU must use the lower-level interfaces, given that one of
> then CPU_ONLINE notifiers might invoke synchronize_rcu().

We can start the threads before the notifiers. There is no
restriction.

Thanks,

	tglx

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