linux-kernel - Re: [patch V2 22/29] lockup_detector: Make watchdog_nmi

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Date:   Thu, 5 Oct 2017 12:17:14 -0400
From:   Don Zickus <dzickus@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Nicholas Piggin <npiggin@...il.com>,
        Chris Metcalf <cmetcalf@...lanox.com>,
        Ulrich Obergfell <uobergfe@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [patch V2 22/29] lockup_detector: Make
 watchdog_nmi_reconfigure() two stage

On Tue, Oct 03, 2017 at 07:27:01PM +0000, Thomas Gleixner wrote:
> On Tue, 3 Oct 2017, Thomas Gleixner wrote:
> > On Tue, 3 Oct 2017, Thomas Gleixner wrote:
> > > On Tue, 3 Oct 2017, Michael Ellerman wrote:
> > > > Hmm, I tried that patch, it makes the warning go away. But then I
> > > > triggered a deliberate hard lockup and got nothing.
> > > > 
> > > > Then I went back to the existing code (in linux-next), and I still get
> > > > no warning from a deliberate hard lockup.
> > > > 
> > > > So seems there may be some more gremlins. Will test more in the morning.
> > > 
> > > Hrm. That's weird. I'll have a look and send a proper patch series on top
> > > of next.
> > 
> > The major difference is that the reworked code utilizes
> > watchdog_nmi_reconfigure() for both init and the sysctl updates, but I
> > can't for my life figure out why that doesn't work.
> 
> I collected the changes which Linus requested along with the nmi_probe()
> one and pushed them into:
> 
>  git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.core/urgent
> 
> That's based on 4.13 final so it neither contains 4.14 nor -next material.

Tested your changes on 4.14-rc3 and it passes my tests.  Thanks!

Tested-and-Reviewed-by: Don Zickus <dzickus@...hat.com>