Groups > linux.kernel > #1199908

Re: [PATCH 4/4] watchdog: use suspend/resume interface in fixup_ht_bug()

From	Don Zickus <dzickus@redhat.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH 4/4] watchdog: use suspend/resume interface in fixup_ht_bug()
Date	2015-08-04 16:30 +0200
Message-ID	<pTLo6-4If-15@gated-at.bofh.it> (permalink)
References	<pSEoF-4YJ-3@gated-at.bofh.it> <pSEoF-4YJ-1@gated-at.bofh.it> <pTKBH-3xf-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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
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Thread

Re: [PATCH 4/4] watchdog: use suspend/resume interface in  fixup_ht_bug() Michal Hocko <mhocko@kernel.org> - 2015-08-04 15:40 +0200
  Re: [PATCH 4/4] watchdog: use suspend/resume interface in  fixup_ht_bug() Don Zickus <dzickus@redhat.com> - 2015-08-04 16:30 +0200
    Re: [PATCH 4/4] watchdog: use suspend/resume interface in  fixup_ht_bug() Michal Hocko <mhocko@kernel.org> - 2015-08-04 16:50 +0200
    Re: [PATCH 4/4] watchdog: use suspend/resume interface in  fixup_ht_bug() Ulrich Obergfell <uobergfe@redhat.com> - 2015-08-04 17:10 +0200

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