From: Don Zickus <dzickus@redhat.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: Ulrich Obergfell <uobergfe@redhat.com>,
linux-kernel@vger.kernel.org, akpm@linux-foundation.org,
atomlin@redhat.com, jolsa@kernel.org, eranian@google.com,
cmetcalf@ezchip.com, fweisbec@gmail.com
Subject: Re: [PATCH 4/4] watchdog: use suspend/resume interface in fixup_ht_bug()
Date: Tue, 4 Aug 2015 10:27:50 -0400 [thread overview]
Message-ID: <20150804142750.GR42530@redhat.com> (raw)
In-Reply-To: <20150804133129.GF28571@dhcp22.suse.cz>
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.
> <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.
Cheers,
Don
next prev parent reply other threads:[~2015-08-04 14:27 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-01 12:49 [PATCH 0/4] watchdog: avoid races in watchdog_nmi_{en|disable} functions Ulrich Obergfell
2015-08-01 12:49 ` [PATCH 1/4] watchdog: introduce watchdog_park_threads() and watchdog_unpark_threads() Ulrich Obergfell
2015-08-04 13:26 ` Michal Hocko
2015-08-04 15:20 ` Ulrich Obergfell
2015-08-01 12:49 ` [PATCH 2/4] watchdog: introduce watchdog_suspend() and watchdog_resume() Ulrich Obergfell
2015-08-01 14:04 ` Guenter Roeck
2015-08-01 14:39 ` Ulrich Obergfell
2015-08-01 14:47 ` Guenter Roeck
2015-08-04 22:58 ` Andrew Morton
2015-08-05 8:10 ` Ulrich Obergfell
2015-08-01 12:49 ` [PATCH 3/4] watchdog: use park/unpark functions in update_watchdog_all_cpus() Ulrich Obergfell
2015-08-01 12:49 ` [PATCH 4/4] watchdog: use suspend/resume interface in fixup_ht_bug() Ulrich Obergfell
2015-08-04 13:31 ` Michal Hocko
2015-08-04 14:27 ` Don Zickus [this message]
2015-08-04 14:44 ` Michal Hocko
2015-08-04 14:59 ` Ulrich Obergfell
2015-08-05 22:17 ` Andrew Morton
2015-08-02 10:54 ` [PATCH 0/4] watchdog: avoid races in watchdog_nmi_{en|disable} functions Aaron Tomlin
2015-08-02 22:14 ` Jiri Olsa
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