Update watchdog_thresh when SOFTLOCKUP_DETECTOR=n.
Additionally fix a build failure in this case as well.

Fixes: 0bff3dababb07 ("watchdog: fix watchdog may detect false positive of softlockup")
Reported-by: Venkat Rao Bagalkote <redacted>
Closes: https://lore.kernel.org/all/339e2b3e-c7ee-418f-a84c-9c6360dc570b@linux.ibm.com (local)
Signed-off-by: Nysal Jan K.A. <redacted>
---
The "Fixes:" SHA1 points to the commit in mm-nonmm-unstable and will need updating

  kernel/watchdog.c | 4 +++-
  1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 80d1a1dae27..2d283e92be5 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c

@@ -923,10 +923,12 @@ static __init void lockup_detector_setup(void)
  }
  
  #else /* CONFIG_SOFTLOCKUP_DETECTOR */
-static void __lockup_detector_reconfigure(void)
+static void __lockup_detector_reconfigure(bool thresh_changed)
  {
  	cpus_read_lock();
  	watchdog_hardlockup_stop();
+	if (thresh_changed)
+		watchdog_thresh = READ_ONCE(watchdog_thresh_next);
  	lockup_detector_update_enable();
  	watchdog_hardlockup_start();
  	cpus_read_unlock();