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-rw-r--r--include/linux/sched.h4
-rw-r--r--kernel/sched.c2
-rw-r--r--kernel/softlockup.c15
3 files changed, 19 insertions, 2 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index d464bd0d6578..6312521df2c1 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -226,6 +226,7 @@ extern void scheduler_tick(void);
extern void softlockup_tick(void);
extern void spawn_softlockup_task(void);
extern void touch_softlockup_watchdog(void);
+extern void touch_all_softlockup_watchdogs(void);
#else
static inline void softlockup_tick(void)
{
@@ -236,6 +237,9 @@ static inline void spawn_softlockup_task(void)
static inline void touch_softlockup_watchdog(void)
{
}
+static inline void touch_all_softlockup_watchdogs(void)
+{
+}
#endif
diff --git a/kernel/sched.c b/kernel/sched.c
index 0227f1625a75..5530ed211f72 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4750,6 +4750,8 @@ void show_state_filter(unsigned long state_filter)
show_task(p);
} while_each_thread(g, p);
+ touch_all_softlockup_watchdogs();
+
read_unlock(&tasklist_lock);
/*
* Only show locks if all tasks are dumped:
diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 5ea631742dbc..8fa7040247ad 100644
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -50,6 +50,16 @@ void touch_softlockup_watchdog(void)
}
EXPORT_SYMBOL(touch_softlockup_watchdog);
+void touch_all_softlockup_watchdogs(void)
+{
+ int cpu;
+
+ /* Cause each CPU to re-update its timestamp rather than complain */
+ for_each_online_cpu(cpu)
+ per_cpu(touch_timestamp, cpu) = 0;
+}
+EXPORT_SYMBOL(touch_all_softlockup_watchdogs);
+
/*
* This callback runs from the timer interrupt, and checks
* whether the watchdog thread has hung or not:
@@ -61,9 +71,10 @@ void softlockup_tick(void)
unsigned long print_timestamp;
unsigned long now;
- /* watchdog task hasn't updated timestamp yet */
- if (touch_timestamp == 0)
+ if (touch_timestamp == 0) {
+ touch_softlockup_watchdog();
return;
+ }
print_timestamp = per_cpu(print_timestamp, this_cpu);

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