Commit 1ada5cba authored by Andi Kleen's avatar Andi Kleen Committed by Ingo Molnar
Browse files

clocksource: make clocksource watchdog cycle through online CPUs



This way it checks if the clocks are synchronized between CPUs too.
This might be able to detect slowly drifting TSCs which only
go wrong over longer time.
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 1077f5a9
......@@ -142,8 +142,13 @@ static void clocksource_watchdog(unsigned long data)
}
if (!list_empty(&watchdog_list)) {
__mod_timer(&watchdog_timer,
watchdog_timer.expires + WATCHDOG_INTERVAL);
/* Cycle through CPUs to check if the CPUs stay synchronized to
* each other. */
int next_cpu = next_cpu(raw_smp_processor_id(), cpu_online_map);
if (next_cpu >= NR_CPUS)
next_cpu = first_cpu(cpu_online_map);
watchdog_timer.expires += WATCHDOG_INTERVAL;
add_timer_on(&watchdog_timer, next_cpu);
}
spin_unlock(&watchdog_lock);
}
......@@ -165,7 +170,7 @@ static void clocksource_check_watchdog(struct clocksource *cs)
if (!started && watchdog) {
watchdog_last = watchdog->read();
watchdog_timer.expires = jiffies + WATCHDOG_INTERVAL;
add_timer(&watchdog_timer);
add_timer_on(&watchdog_timer, first_cpu(cpu_online_map));
}
} else {
if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS)
......@@ -186,7 +191,8 @@ static void clocksource_check_watchdog(struct clocksource *cs)
watchdog_last = watchdog->read();
watchdog_timer.expires =
jiffies + WATCHDOG_INTERVAL;
add_timer(&watchdog_timer);
add_timer_on(&watchdog_timer,
first_cpu(cpu_online_map));
}
}
}
......
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