linux-kernel - Re: CPU Hotplug rework

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Message-ID: <1334104638.23924.233.camel@gandalf.stny.rr.com>
Date:	Tue, 10 Apr 2012 20:37:18 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Arjan van de Ven <arjan@...radead.org>,
	"rusty@...tcorp.com.au" <rusty@...tcorp.com.au>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Milton Miller <miltonm@....com>,
	"mingo@...e.hu" <mingo@...e.hu>, Tejun Heo <tj@...nel.org>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Linux PM mailing list <linux-pm@...r.kernel.org>
Subject: Re: CPU Hotplug rework

On Tue, 2012-04-10 at 17:28 -0700, Paul E. McKenney wrote:

> > Just to throw out the stupid silly approach.
> > 
> > What about creating a "__register_cpu_notifier()" that just does:
> > 
> > int __ref __register_cpu_notifier(struct notifier_block *nb)
> > {
> > 	return raw_notifier_chain_register(&cpu_chain, nb);
> > }
> > 
> > Also making cpu_maps_update_begin/done() global (and probably rename
> > them).

I just noticed that the cpu_maps_update_begin/done() are already global.

> > 
> > and then in the above code do:
> > 
> > 	cpu_maps_update_begin();
> > 	__register_cpu_notifier(nb);
> > 	do_setup();
> > 	cpu_maps_update_done();
> > 
> > 
> > Just saying,
> 
> That does have some attractive properties, now that you mention it.  ;-)

Which property? Stupid or Silly ;-)


-- Steve


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