linux-kernel - [PATCH 0/2] Introduce update_arch_nmi_watchdog for arch specific handlers

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Date:   Thu,  6 Oct 2016 15:16:41 -0700
From:   Babu Moger <babu.moger@...cle.com>
To:     mingo@...nel.org, akpm@...ux-foundation.org, ak@...ux.intel.com,
        jkosina@...e.cz, baiyaowei@...s.chinamobile.com,
        dzickus@...hat.com, atomlin@...hat.com, uobergfe@...hat.com,
        tj@...nel.org, hidehiro.kawai.ez@...achi.com, johunt@...mai.com,
        davem@...emloft.net, sparclinux@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, babu.moger@...cle.com
Subject: [PATCH 0/2] Introduce update_arch_nmi_watchdog for arch specific handlers

During our testing we noticed that nmi watchdogs in sparc could not be disabled or
enabled dynamically using sysctl/proc interface. Sparc uses its own arch specific
nmi watchdogs. There is a sysctl and proc interface(proc/sys/kernel/nmi_watchdog)
to enable/disable nmi watchdogs. However, that is not working for sparc. There
is no interface to feed this parameter to arch specific nmi watchdogs.

These patches extend the same sysctl/proc interface to enable or disable
these arch specific nmi watchdogs dynamically. Introduced new function
update_arch_nmi_watchdog which can be implemented in arch specific handlers.
If you think there is a better way to do this. Please advice.

Tested on sparc. Compile tested on x86.

Babu Moger (2):
  watchdog: Introduce update_arch_nmi_watchdog
  sparc: Implement update_arch_nmi_watchdog

 arch/sparc/kernel/nmi.c |   26 ++++++++++++++++++++++++++
 include/linux/nmi.h     |    1 +
 kernel/watchdog.c       |   16 +++++++++++++---
 3 files changed, 40 insertions(+), 3 deletions(-)