perf: Fix wakeup storm for RO mmap()s

[linux.git] / kernel / softlockup.c

diff --git a/kernel/softlockup.c b/kernel/softlockup.c
index 0d4c7898ab805dd868880e7deca2d0d69d88fc67..4b493f67dcb562c183258115619539f3a68cd62a 100644 (file)
--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -155,11 +155,11 @@ void softlockup_tick(void)
         * Wake up the high-prio watchdog task twice per
         * threshold timespan.
         */
-       if (now > touch_ts + softlockup_thresh/2)
+       if (time_after(now - softlockup_thresh/2, touch_ts))
                wake_up_process(per_cpu(softlockup_watchdog, this_cpu));
 
        /* Warn about unreasonable delays: */
-       if (now <= (touch_ts + softlockup_thresh))
+       if (time_before_eq(now - softlockup_thresh, touch_ts))
                return;
 
        per_cpu(softlockup_print_ts, this_cpu) = touch_ts;