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Date: Tue, 13 Dec 2016 21:50:38 +0100
From: Ingo Molnar <mingo@kernel.org>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: stable kernel team <stable@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [tip:smp/urgent] hotplug: Make register and unregister notifier
 API symmetric
Message-ID: <20161213205038.GA13917@gmail.com>
References: <20161213063958.GA26747@gmail.com>
 <20161213121855.GA27163@kroah.com>
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* Greg KH <gregkh@linuxfoundation.org> wrote:

> On Tue, Dec 13, 2016 at 07:39:58AM +0100, Ingo Molnar wrote:
> > 
> > hi Greg,
> > 
> > Please apply this fix to v4.9-stable as well, it's now upstream.
> 
> Ok, it looks like it belongs in older stable kernels as well, based on
> the fixes: tag, correct?

Yes, indeed - but the testing was v4.9 based and there's been all sorts of changes 
in the CPU hotplug machinery.

The fixes tag:

> > Fixes: 47e627bc8c9a ("[PATCH] hotplug: Allow modules to use the cpu hotplug notifiers even if !CONFIG_HOTPLUG_CPU")

Suggests it's an ancient bug and 777c6e0daebb3fce cherry-picks fine as far back as 
v4.6.

Thanks,

	Ingo