linux-kernel - Re: [PATCH v4 0/5] Improve watchdog config for arch watchdogs

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Message-ID: <20170616145022.6vl452dpwgpw5q4f@redhat.com>
Date:   Fri, 16 Jun 2017 10:50:22 -0400
From:   Don Zickus <dzickus@...hat.com>
To:     Nicholas Piggin <npiggin@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Babu Moger <babu.moger@...cle.com>, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4 0/5] Improve watchdog config for arch watchdogs

(adding Andrew)

On Fri, Jun 16, 2017 at 04:57:10PM +1000, Nicholas Piggin wrote:
> This is the latest series to make the hardlockup watchdog more
> easily replaceable by arch code. The last patch provides some
> justification for why we want to do this (existing sparc watchdog
> is another that could benefit).
> 
> Since last time, we tidied up the Kconfig approach so it was not
> so jumbled -- Thanks Don and Babu for help and suggestions there.

Thanks Nick!  I think this version is good enough for now.

> 
> Since last posting the powerpc patch, I re-added the soft-NMI
> watchdog, but have it using the emergency stack so we can always
> avoid the process stacks when perf interrupts are soft-masked.
> 
> I'm not sure of the best strategy to merge this. The powerpc
> watchdog is too much to carry anywhere but powerpc tree now, and
> watchdog patches seem to go via Andrew...

Andrew, suggestions here?


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


> 
> Thanks,
> Nick
> 
> Nicholas Piggin (5):
>   watchdog: remove unused declaration
>   watchdog: introduce arch_touch_nmi_watchdog()
>   watchdog: split up config options
>   watchdog: provide watchdog_reconfigure() for arch watchdogs
>   powerpc/64s: implement arch-specific hardlockup watchdog
> 
>  arch/Kconfig                               |  23 ++
>  arch/blackfin/include/asm/nmi.h            |   2 +
>  arch/blackfin/kernel/nmi.c                 |   2 +-
>  arch/mn10300/include/asm/nmi.h             |   2 +
>  arch/mn10300/kernel/mn10300-watchdog-low.S |   8 +-
>  arch/mn10300/kernel/mn10300-watchdog.c     |   2 +-
>  arch/powerpc/Kconfig                       |   6 +-
>  arch/powerpc/include/asm/nmi.h             |  11 +
>  arch/powerpc/include/asm/smp.h             |   2 +
>  arch/powerpc/kernel/Makefile               |   1 +
>  arch/powerpc/kernel/exceptions-64s.S       |  30 ++-
>  arch/powerpc/kernel/kvm.c                  |   7 +
>  arch/powerpc/kernel/setup_64.c             |  19 --
>  arch/powerpc/kernel/smp.c                  |  20 +-
>  arch/powerpc/kernel/watchdog.c             | 388 +++++++++++++++++++++++++++++
>  arch/sparc/include/asm/nmi.h               |   1 +
>  arch/sparc/kernel/nmi.c                    |   6 +-
>  arch/x86/Kconfig                           |   1 +
>  arch/x86/kernel/apic/hw_nmi.c              |   2 +-
>  include/linux/nmi.h                        |  57 +++--
>  kernel/Makefile                            |   2 +-
>  kernel/sysctl.c                            |  31 ++-
>  kernel/watchdog.c                          | 268 +++++++++++++-------
>  kernel/watchdog_hld.c                      |  37 +--
>  lib/Kconfig.debug                          |  45 ++--
>  25 files changed, 763 insertions(+), 210 deletions(-)
>  create mode 100644 arch/powerpc/kernel/watchdog.c
> 
> -- 
> 2.11.0
>