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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-03-25 03:53:42 -0300
commit03dd4cb26d967f9588437b0fc9cc0e8353322bb7 (patch)
treefa581f6dc1c0596391690d1f67eceef3af8246dc /kernel/watchdog.c
parentd4e493caf788ef44982e131ff9c786546904d934 (diff)
Linux-libre 4.5-gnu
Diffstat (limited to 'kernel/watchdog.c')
-rw-r--r--kernel/watchdog.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 18f34cf75..b3ace6ebb 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -20,6 +20,7 @@
#include <linux/smpboot.h>
#include <linux/sched/rt.h>
#include <linux/tick.h>
+#include <linux/workqueue.h>
#include <asm/irq_regs.h>
#include <linux/kvm_para.h>
@@ -225,7 +226,15 @@ static void __touch_watchdog(void)
__this_cpu_write(watchdog_touch_ts, get_timestamp());
}
-void touch_softlockup_watchdog(void)
+/**
+ * touch_softlockup_watchdog_sched - touch watchdog on scheduler stalls
+ *
+ * Call when the scheduler may have stalled for legitimate reasons
+ * preventing the watchdog task from executing - e.g. the scheduler
+ * entering idle state. This should only be used for scheduler events.
+ * Use touch_softlockup_watchdog() for everything else.
+ */
+void touch_softlockup_watchdog_sched(void)
{
/*
* Preemption can be enabled. It doesn't matter which CPU's timestamp
@@ -233,6 +242,12 @@ void touch_softlockup_watchdog(void)
*/
raw_cpu_write(watchdog_touch_ts, 0);
}
+
+void touch_softlockup_watchdog(void)
+{
+ touch_softlockup_watchdog_sched();
+ wq_watchdog_touch(raw_smp_processor_id());
+}
EXPORT_SYMBOL(touch_softlockup_watchdog);
void touch_all_softlockup_watchdogs(void)
@@ -246,6 +261,7 @@ void touch_all_softlockup_watchdogs(void)
*/
for_each_watchdog_cpu(cpu)
per_cpu(watchdog_touch_ts, cpu) = 0;
+ wq_watchdog_touch(-1);
}
#ifdef CONFIG_HARDLOCKUP_DETECTOR
@@ -351,7 +367,7 @@ static void watchdog_overflow_callback(struct perf_event *event,
trigger_allbutself_cpu_backtrace();
if (hardlockup_panic)
- panic("Hard LOCKUP");
+ nmi_panic(regs, "Hard LOCKUP");
__this_cpu_write(hard_watchdog_warn, true);
return;