The patch titled
Subject: watchdog-provide-watchdog_reconfigure-for-arch-watchdogs-fix
has been added to the -mm tree. Its filename is
watchdog-provide-watchdog_reconfigure-for-arch-watchdogs-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/watchdog-provide-watchdog_reconfigure-for-arch-watchdogs-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/watchdog-provide-watchdog_reconfigure-for-arch-watchdogs-fix.patch
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------------------------------------------------------
From: Nicholas Piggin <npiggin@xxxxxxxxx>
Subject: watchdog-provide-watchdog_reconfigure-for-arch-watchdogs-fix
add code comments
Link: http://lkml.kernel.org/r/20170617125933.774d3858@xxxxxxxxxxxxxxxxxxx
Cc: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Babu Moger <babu.moger@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/watchdog.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
diff -puN kernel/watchdog.c~watchdog-provide-watchdog_reconfigure-for-arch-watchdogs-fix kernel/watchdog.c
--- a/kernel/watchdog.c~watchdog-provide-watchdog_reconfigure-for-arch-watchdogs-fix
+++ a/kernel/watchdog.c
@@ -114,6 +114,10 @@ int __read_mostly watchdog_suspended;
/*
* These functions can be overridden if an architecture implements its
* own hardlockup detector.
+ *
+ * watchdog_nmi_enable/disable can be implemented to start and stop when
+ * softlockup watchdog threads start and stop. The arch must select the
+ * SOFTLOCKUP_DETECTOR Kconfig.
*/
int __weak watchdog_nmi_enable(unsigned int cpu)
{
@@ -123,6 +127,17 @@ void __weak watchdog_nmi_disable(unsigne
{
}
+/*
+ * watchdog_nmi_reconfigure can be implemented to be notified after any
+ * watchdog configuration change. The arch hardlockup watchdog should
+ * respond to the following variables:
+ * - nmi_watchdog_enabled
+ * - watchdog_thresh
+ * - watchdog_cpumask
+ * - sysctl_hardlockup_all_cpu_backtrace
+ * - hardlockup_panic
+ * - watchdog_suspended
+ */
void __weak watchdog_nmi_reconfigure(void)
{
}
_
Patches currently in -mm which might be from npiggin@xxxxxxxxx are
watchdog-remove-unused-declaration.patch
watchdog-introduce-arch_touch_nmi_watchdog.patch
watchdog-split-up-config-options.patch
watchdog-provide-watchdog_reconfigure-for-arch-watchdogs.patch
watchdog-provide-watchdog_reconfigure-for-arch-watchdogs-fix.patch
powerpc-64s-implement-arch-specific-hardlockup-watchdog.patch
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