linux-kernel - Re: [PATCH 4/4] watchdog: use suspend/resume interface in fixup_ht

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Message-ID: <20150804144434.GJ28571@dhcp22.suse.cz>
Date:	Tue, 4 Aug 2015 16:44:34 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Ulrich Obergfell <uobergfe@...hat.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	atomlin@...hat.com, jolsa@...nel.org, eranian@...gle.com,
	cmetcalf@...hip.com, fweisbec@...il.com
Subject: Re: [PATCH 4/4] watchdog: use suspend/resume interface in
 fixup_ht_bug()

On Tue 04-08-15 10:27:50, Don Zickus wrote:
> On Tue, Aug 04, 2015 at 03:31:30PM +0200, Michal Hocko wrote:
> > On Sat 01-08-15 14:49:25, Ulrich Obergfell wrote:
> > [...]
> > > @@ -3368,7 +3368,10 @@ static __init int fixup_ht_bug(void)
> > >  		return 0;
> > >  	}
> > >  
> > > -	watchdog_nmi_disable_all();
> > > +	if (watchdog_suspend() != 0) {
> > > +		pr_info("failed to disable PMU erratum BJ122, BV98, HSD29 workaround\n");
> > > +		return 0;
> > > +	}
> > 
> > Is this really worth reporting to the log? What is an admin supposed to
> > do about it?
> 
> I think it was more for developers to aid in debugging a strange behaviour
> of the performance counters.

pr_debug then?

> > <looking into the code>
> > Ok, so kthread_park fails only when the kernel thread has already
> > exited. Can this ever happen during this call path?
> 
> It might be overkill, but it is just a harmless informational failure
> message.

Maybe we have way too many of those harmless informational failure
admins scratch their heads about...
-- 
Michal Hocko
SUSE Labs
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