linux-kernel - Re: [PATCH 1/1] cpu-hotplug: export cpu_hotplug_enable/cpu_hotplug

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Message-ID: <20150623181310.GG3644@twins.programming.kicks-ass.net>
Date:	Tue, 23 Jun 2015 20:13:10 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"rafael.j.wysocki@...el.com" <rafael.j.wysocki@...el.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH  1/1] cpu-hotplug: export
 cpu_hotplug_enable/cpu_hotplug_disable

On Tue, Jun 23, 2015 at 04:57:05PM +0000, KY Srinivasan wrote:

> > diff --git a/kernel/cpu.c b/kernel/cpu.c
> > index 94bbe46..8f35ee6 100644
> > --- a/kernel/cpu.c
> > +++ b/kernel/cpu.c
> > @@ -190,17 +190,19 @@ void cpu_hotplug_done(void)
> >  void cpu_hotplug_disable(void)
> >  {
> >  	cpu_maps_update_begin();
> > -	cpu_hotplug_disabled = 1;
> > +	cpu_hotplug_disabled++;
> >  	cpu_maps_update_done();
> >  }
> > +EXPORT_SYMBOL_GPL(cpu_hotplug_disable);
> > 
> >  void cpu_hotplug_enable(void)
> >  {
> >  	cpu_maps_update_begin();
> > -	cpu_hotplug_disabled = 0;
> > +	if (cpu_hotplug_disabled)
> > +		cpu_hotplug_disabled--;

No that just papers over bugs.

> >  	cpu_maps_update_done();
> >  }
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