From: Ingo Molnar Date: Wed, 17 Oct 2007 06:26:06 +0000 (-0700) Subject: softlockup: use cpu_clock() instead of sched_clock() X-Git-Tag: firefly_0821_release~25392 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=a3b13c23f186ecb57204580cc1f2dbe9c284953a;p=firefly-linux-kernel-4.4.55.git softlockup: use cpu_clock() instead of sched_clock() sched_clock() is not a reliable time-source, use cpu_clock() instead. Signed-off-by: Ingo Molnar Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/kernel/softlockup.c b/kernel/softlockup.c index 708d4882c0c3..68f7606b4160 100644 --- a/kernel/softlockup.c +++ b/kernel/softlockup.c @@ -40,14 +40,16 @@ static struct notifier_block panic_block = { * resolution, and we don't need to waste time with a big divide when * 2^30ns == 1.074s. */ -static unsigned long get_timestamp(void) +static unsigned long get_timestamp(int this_cpu) { - return sched_clock() >> 30; /* 2^30 ~= 10^9 */ + return cpu_clock(this_cpu) >> 30; /* 2^30 ~= 10^9 */ } void touch_softlockup_watchdog(void) { - __raw_get_cpu_var(touch_timestamp) = get_timestamp(); + int this_cpu = raw_smp_processor_id(); + + __raw_get_cpu_var(touch_timestamp) = get_timestamp(this_cpu); } EXPORT_SYMBOL(touch_softlockup_watchdog); @@ -91,7 +93,7 @@ void softlockup_tick(void) return; } - now = get_timestamp(); + now = get_timestamp(this_cpu); /* Wake up the high-prio watchdog task every second: */ if (now > (touch_timestamp + 1))