From 8c2eb4805d422bdbf60ba00ff233c794d23c3c00 Mon Sep 17 00:00:00 2001 From: Colin Ian King <colin.king@canonical.com> Date: Fri, 19 Mar 2010 10:28:02 +0000 Subject: 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> --- kernel/softlockup.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/softlockup.c b/kernel/softlockup.c index 0d4c789..4b493f6 100644 --- 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; -- cgit v1.1