Date: Fri, 1 May 2015 09:46:18 -0400
From: Don Zickus <dzickus@redhat.com>
To: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>, Ingo Molnar <mingo@kernel.org>,
        Andrew Morton <akpm@linux-foundation.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 v10 2/3] watchdog: add watchdog_cpumask sysctl to assist
 nohz
Message-ID: <20150501134618.GJ98296@redhat.com>
References: <1430422766-19703-1-git-send-email-cmetcalf@ezchip.com>
 <1430422766-19703-3-git-send-email-cmetcalf@ezchip.com>
 <20150430200036.GF98296@redhat.com>
 <55428C10.4070904@ezchip.com>
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On Thu, Apr 30, 2015 at 04:09:52PM -0400, Chris Metcalf wrote:
> On 04/30/2015 04:00 PM, Don Zickus wrote:
> >On Thu, Apr 30, 2015 at 03:39:25PM -0400, Chris Metcalf wrote:
> >>  		if (err)
> >>  			pr_err("Failed to create watchdog threads, disabled\n");
> >>+		else {
> >>+			if (smpboot_update_cpumask_percpu_thread(
> >>+				    &watchdog_threads, &watchdog_cpumask))
> >>+				pr_err("Failed to set cpumask for watchdog threads\n");
> >Stupid nitpick, this error message tells us the 'watchdog' threads caused
> >the cpumask failure, but ....
> >
> >>+			/*
> >>+			 * Failure would be due to being unable to allocate
> >>+			 * a temporary cpumask, so we are likely not in a
> >>+			 * position to do much else to make things better.
> >>+			 */
> >>+			if (smpboot_update_cpumask_percpu_thread(
> >>+				    &watchdog_threads, &watchdog_cpumask) != 0)
> >>+				pr_err("cpumask update failed\n");
> >This one does not. :-(  If there is a respin, I would suggest copying the
> >above message down here.
> 
> There is that "#define pr_fmt(fmt)" at the top of the file that prefixes
> all the messages with "NMI watchdog: ", though.  I think that's
> sufficient to make it clear what the second message is about.
> (The first message I wrote the way I did to be parallel with the
> message just before it, if the thread creation failed.)

Ah, yes.  Nevermind.  I keep forgetting about that. :-)

Cheers,
Don
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