kgdb: clocksource watchdog
In order to not trip the clocksource watchdog, kgdb must touch the
clocksource watchdog on the return to normal system run state.
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 85778a4..3509447 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -216,6 +216,7 @@
/* used to install a new clocksource */
extern int clocksource_register(struct clocksource*);
extern void clocksource_unregister(struct clocksource*);
+extern void clocksource_touch_watchdog(void);
extern struct clocksource* clocksource_get_next(void);
extern void clocksource_change_rating(struct clocksource *cs, int rating);
extern void clocksource_resume(void);
diff --git a/kernel/kgdb.c b/kernel/kgdb.c
index 017ee78..e3f6037 100644
--- a/kernel/kgdb.c
+++ b/kernel/kgdb.c
@@ -28,6 +28,7 @@
* kind, whether express or implied.
*/
#include <linux/pid_namespace.h>
+#include <linux/clocksource.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/console.h>
@@ -574,6 +575,7 @@
/* Signal the primary CPU that we are done: */
atomic_set(&cpu_in_kgdb[cpu], 0);
+ clocksource_touch_watchdog();
local_irq_restore(flags);
}
#endif
@@ -1396,6 +1398,7 @@
atomic_read(&kgdb_cpu_doing_single_step) != cpu) {
atomic_set(&kgdb_active, -1);
+ clocksource_touch_watchdog();
local_irq_restore(flags);
goto acquirelock;
@@ -1487,6 +1490,7 @@
kgdb_restore:
/* Free kgdb_active */
atomic_set(&kgdb_active, -1);
+ clocksource_touch_watchdog();
local_irq_restore(flags);
return error;
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index 7f60097..f61402b 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -222,6 +222,18 @@
}
/**
+ * clocksource_touch_watchdog - Update watchdog
+ *
+ * Update the watchdog after exception contexts such as kgdb so as not
+ * to incorrectly trip the watchdog.
+ *
+ */
+void clocksource_touch_watchdog(void)
+{
+ clocksource_resume_watchdog();
+}
+
+/**
* clocksource_get_next - Returns the selected clocksource
*
*/