time: Avoid scary backtraces when warning of > 11% adj

Folks have been getting a number of warnings about time
adjustments > 11%. The WARN_ON leaves a big useless backtrace
so this patch removes it for a printk_once().

I'm still working to narrow down the cause of the > 11% adjustment.

Signed-off-by: John Stultz <john.stultz@linaro.org>

1 files changed, 6 insertions, 4 deletions

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 5d76e09ddd3d..16a175bed355 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -869,13 +869,15 @@ static void timekeeping_adjust(s64 offset)
         } else /* No adjustment needed */
                 return;
 
-        WARN_ONCE(timekeeper.clock->maxadj &&
-                        (timekeeper.mult + adj > timekeeper.clock->mult +
-                                                timekeeper.clock->maxadj),
-                        "Adjusting %s more then 11%% (%ld vs %ld)\n",
+        if (unlikely(timekeeper.clock->maxadj &&
+                        (timekeeper.mult + adj >
+                        timekeeper.clock->mult + timekeeper.clock->maxadj))) {
+                printk_once(KERN_WARNING
+                        "Adjusting %s more than 11%% (%ld vs %ld)\n",
                         timekeeper.clock->name, (long)timekeeper.mult + adj,
                         (long)timekeeper.clock->mult +
                                 timekeeper.clock->maxadj);
+        }
         /*
          * So the following can be confusing.
          *