Date: Wed, 29 Apr 2015 15:26:13 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>, Don Zickus <dzickus@redhat.com>,
        Ingo Molnar <mingo@kernel.org>, Andrew Jones <drjones@redhat.com>,
        chai wen <chaiw.fnst@cn.fujitsu.com>,
        Ulrich Obergfell <uobergfe@redhat.com>,
        Fabian Frederick <fabf@skynet.be>, Aaron Tomlin <atomlin@redhat.com>,
        Ben Zhang <benzh@chromium.org>, "Christoph Lameter" <cl@linux.com>,
        Gilad Ben-Yossef <gilad@benyossef.com>,
        "Steven Rostedt" <rostedt@goodmis.org>, <linux-kernel@vger.kernel.org>,
        "Jonathan Corbet" <corbet@lwn.net>, <linux-doc@vger.kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>
Subject: Re: [PATCH v9 1/3] smpboot: allow excluding cpus from the smpboot
 threads
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References: <20150416152808.GA16270@lerouge>
	<1429295838-6328-1-git-send-email-cmetcalf@ezchip.com>
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On Fri, 17 Apr 2015 14:37:16 -0400 Chris Metcalf <cmetcalf@ezchip.com> wrote:

> This change allows some cores to be excluded from running the
> smp_hotplug_thread tasks.  The following commit to update
> kernel/watchdog.c to use this functionality is the motivating
> example, and more information on the motivation is provided there.
> 
> A new smp_hotplug_thread field is introduced, "cpumask", which
> is cpumask field managed by the smpboot subsystem that indicates whether
> or not the given smp_hotplug_thread should run on that core; the
> cpumask is checked when deciding whether to unpark the thread.
> 
> To limit the cpumask to less than cpu_possible, you must call
> smpboot_update_cpumask_percpu_thread() after registering.

Has Thomas commented on any version of this?   t'would be nice.
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