Commit-ID: 6554fd8cf06db86f861bb24d7487b2873ca444c4
Gitweb: http://git.kernel.org/tip/6554fd8cf06db86f861bb24d7487b2873ca444c4
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Tue, 12 Sep 2017 21:36:57 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 14 Sep 2017 11:41:03 +0200
watchdog/core: Provide interface to stop from poweroff()
PARISC has a a busy looping power off routine. If the watchdog is enabled
the watchdog timer will still fire, but the thread is not running, which
causes the softlockup watchdog to trigger.
Provide a interface which allows to turn the watchdog off.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Don Zickus <dzickus@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Chris Metcalf <cmetcalf@xxxxxxxxxxxx>
Cc: Helge Deller <deller@xxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Sebastian Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Ulrich Obergfell <uobergfe@xxxxxxxxxx>
Cc: linux-parisc@xxxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20170912194146.327343752@xxxxxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
include/linux/nmi.h | 6 +++---
kernel/watchdog.c | 14 +++++++++++++-
2 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/include/linux/nmi.h b/include/linux/nmi.h
index b24d4a5..85bb268b 100644
--- a/include/linux/nmi.h
+++ b/include/linux/nmi.h
@@ -12,10 +12,10 @@
#ifdef CONFIG_LOCKUP_DETECTOR
void lockup_detector_init(void);
+void lockup_detector_soft_poweroff(void);
#else
-static inline void lockup_detector_init(void)
-{
-}
+static inline void lockup_detector_init(void) { }
+static inline void lockup_detector_soft_poweroff(void) { }
#endif
#ifdef CONFIG_SOFTLOCKUP_DETECTOR
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index f5d5202..f23e373 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -333,7 +333,8 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
int duration;
int softlockup_all_cpu_backtrace = sysctl_softlockup_all_cpu_backtrace;
- if (atomic_read(&watchdog_park_in_progress) != 0)
+ if (!watchdog_enabled ||
+ atomic_read(&watchdog_park_in_progress) != 0)
return HRTIMER_NORESTART;
/* kick the hardlockup detector */
@@ -660,6 +661,17 @@ static void set_sample_period(void)
}
#endif /* SOFTLOCKUP */
+/**
+ * lockup_detector_soft_poweroff - Interface to stop lockup detector(s)
+ *
+ * Special interface for parisc. It prevents lockup detector warnings from
+ * the default pm_poweroff() function which busy loops forever.
+ */
+void lockup_detector_soft_poweroff(void)
+{
+ watchdog_enabled = 0;
+}
+
/*
* Suspend the hard and soft lockup detector by parking the watchdog threads.
*/
--
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