linux-kernel - Re: [PATCH] watchdog: Fix race on single cpu boot

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Message-ID: <110159750.2156696.1438434352724.JavaMail.zimbra@redhat.com>
Date:	Sat, 1 Aug 2015 09:05:52 -0400 (EDT)
From:	Ulrich Obergfell <uobergfe@...hat.com>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Jiri Olsa <jolsa@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	lkml <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, Michal Hocko <mhocko@...e.cz>,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Paul Bunyan <pbunyan@...hat.com>
Subject: Re: [PATCH] watchdog: Fix race on single cpu boot


Don,

> Uli privately has been working on a patchset that cleans up a bunch of these
> race conditions.  We believe it should cover this case.  It uses the
> proc_mutex to synchronize everything.
>
> I think he is reaching out to you.  If you could try his patchset to see if
> it fixes things, it might be a cleaner approach than what you are doing.
>
> <small time goes by>
>
> Ok, I was poked on IRC and you have already done this and it passed your
> testcase.  Let me get Uli to post his patches. :-)
>
> Cheers,
> Don

I posted the patch set here:

  https://lkml.org/lkml/2015/8/1/64
  https://lkml.org/lkml/2015/8/1/65
  https://lkml.org/lkml/2015/8/1/66
  https://lkml.org/lkml/2015/8/1/67
  https://lkml.org/lkml/2015/8/1/68

Regards,

Uli
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