After reconfiguring watchdog sysctls etc., architecture specific
watchdogs may not get all their parameters updated.
watchdog_reconfigure() can be implemented to pull the new values
in and set the arch NMI watchdog.
Signed-off-by: Nicholas Piggin <npig...@gmail.com>
---
kernel/watchdog.c | 29 +++++++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index deb010505646..5397c637db2d 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -120,6 +120,11 @@ void __weak watchdog_nmi_disable(unsigned int cpu)
{
}
+void __weak watchdog_nmi_reconfigure(void)
+{
+}
+
+
#ifdef CONFIG_SOFTLOCKUP_DETECTOR
/* Helper for online, unparked cpus. */
@@ -597,6 +602,12 @@ static void watchdog_disable_all_cpus(void)
}
}
+static int watchdog_update_cpus(void)
+{
+ return smpboot_update_cpumask_percpu_thread(
+ &watchdog_threads, &watchdog_cpumask);
+}
+
#else /* SOFTLOCKUP */
static int watchdog_park_threads(void)
{
@@ -616,6 +627,11 @@ static void watchdog_disable_all_cpus(void)
{
}
+static int watchdog_update_cpus(void)
+{
+ return 0;
+}
+
static void set_sample_period(void)
{
}
@@ -648,6 +664,8 @@ int lockup_detector_suspend(void)
watchdog_enabled = 0;
}
+ watchdog_nmi_reconfigure();
+
mutex_unlock(&watchdog_proc_mutex);
return ret;
@@ -668,6 +686,8 @@ void lockup_detector_resume(void)
if (watchdog_running && !watchdog_suspended)
watchdog_unpark_threads();
+ watchdog_nmi_reconfigure();
+
mutex_unlock(&watchdog_proc_mutex);
put_online_cpus();
}
@@ -693,6 +713,8 @@ static int proc_watchdog_update(void)
else
watchdog_disable_all_cpus();
+ watchdog_nmi_reconfigure();
+
return err;
}
@@ -878,12 +900,11 @@ int proc_watchdog_cpumask(struct ctl_table *table, int
write,
* a temporary cpumask, so we are likely not in a
* position to do much else to make things better.
*/
-#ifdef CONFIG_SOFTLOCKUP_DETECTOR
- if (smpboot_update_cpumask_percpu_thread(
- &watchdog_threads, &watchdog_cpumask) != 0)
+ if (watchdog_update_cpus() != 0)
pr_err("cpumask update failed\n");
-#endif
}
+
+ watchdog_nmi_reconfigure();
}
out:
mutex_unlock(&watchdog_proc_mutex);
--
2.11.0
