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softlockup: Stop spurious softlockup messages due to overflow 

Ensure additions on touch_ts do not overflow.  This can occur
when the top 32 bits of the TSC reach 0xffffffff causing
additions to touch_ts to overflow and this in turn generates
spurious softlockup warnings.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: <stable@kernel.org>
LKML-Reference: <1268994482.1798.6.camel@lenovo>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Colin Ian King 2010-03-19 10:28:02 +00:00 committed by Ingo Molnar
parent 0cff810f54
commit 8c2eb4805d
1 changed files with 2 additions and 2 deletions
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4
kernel/softlockup.c
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@ -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;