linux-kernel - Re: [PATCH v5 2/2] watchdog: add watchdog

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Message-ID: <55257F9C.3050105@ezchip.com>
Date:	Wed, 8 Apr 2015 15:21:00 -0400
From:	Chris Metcalf <cmetcalf@...hip.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
CC:	Don Zickus <dzickus@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrew Jones <drjones@...hat.com>,
	chai wen <chaiw.fnst@...fujitsu.com>,
	Ulrich Obergfell <uobergfe@...hat.com>,
	Fabian Frederick <fabf@...net.be>,
	Aaron Tomlin <atomlin@...hat.com>,
	Ben Zhang <benzh@...omium.org>,
	Christoph Lameter <cl@...ux.com>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	<linux-kernel@...r.kernel.org>, Jonathan Corbet <corbet@....net>,
	<linux-doc@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v5 2/2] watchdog: add watchdog_exclude sysctl to assist
 nohz

On 04/08/2015 10:01 AM, Frederic Weisbecker wrote:
> How about creating smpboot_update_mask_percpu_thread() and handle it from smpboot,
> this way future evolutions of smpboot won't overlook this cpumask live change?

It seemed like your proposed approach was actually a bit heavier-weight
from the perspective of generic smp_hotplug_thread, so instead I just
modified the proposed API to have a simple "valid_cpu()" callback,
which I think is clear and won't be damaged by smpboot evolution.
Let me know what you think.

-- 
Chris Metcalf, EZChip Semiconductor
http://www.ezchip.com

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