* [patch 03/29] lockup_detector: Provide interface to stop from poweroff()
[not found] <20170831071558.995235362@linutronix.de>
@ 2017-08-31 7:16 ` Thomas Gleixner
2017-08-31 7:16 ` [patch 04/29] parisc: Use lockup_detector_stop() Thomas Gleixner
1 sibling, 0 replies; 2+ messages in thread
From: Thomas Gleixner @ 2017-08-31 7:16 UTC (permalink / raw)
To: LKML
Cc: Peter Zijlstra, Ingo Molnar, Andrew Morton, Borislav Petkov,
Sebastian Siewior, Nicholas Piggin, Don Zickus, Chris Metcalf,
Ulrich Obergfell, Helge Deller, linux-parisc
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@linutronix.de>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
---
include/linux/nmi.h | 6 +++---
kernel/watchdog.c | 14 +++++++++++++-
2 files changed, 16 insertions(+), 4 deletions(-)
--- 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
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -333,7 +333,8 @@ static enum hrtimer_restart watchdog_tim
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.
*/
^ permalink raw reply [flat|nested] 2+ messages in thread
* [patch 04/29] parisc: Use lockup_detector_stop()
[not found] <20170831071558.995235362@linutronix.de>
2017-08-31 7:16 ` [patch 03/29] lockup_detector: Provide interface to stop from poweroff() Thomas Gleixner
@ 2017-08-31 7:16 ` Thomas Gleixner
1 sibling, 0 replies; 2+ messages in thread
From: Thomas Gleixner @ 2017-08-31 7:16 UTC (permalink / raw)
To: LKML
Cc: Peter Zijlstra, Ingo Molnar, Andrew Morton, Borislav Petkov,
Sebastian Siewior, Nicholas Piggin, Don Zickus, Chris Metcalf,
Ulrich Obergfell, Helge Deller, linux-parisc
The broken lockup_detector_suspend/resume() interface is going away. Use
the new lockup_detector_soft_poweroff() interface to stop the watchdog from
the busy looping power off routine.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Helge Deller <deller@gmx.de>
Cc: linux-parisc@vger.kernel.org
---
arch/parisc/kernel/process.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/parisc/kernel/process.c
+++ b/arch/parisc/kernel/process.c
@@ -146,7 +146,7 @@ void machine_power_off(void)
/* prevent soft lockup/stalled CPU messages for endless loop. */
rcu_sysrq_start();
- lockup_detector_suspend();
+ lockup_detector_soft_poweroff();
for (;;);
}
^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-08-31 7:16 ` [patch 03/29] lockup_detector: Provide interface to stop from poweroff() Thomas Gleixner
2017-08-31 7:16 ` [patch 04/29] parisc: Use lockup_detector_stop() Thomas Gleixner
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