From 3150e63df41450a795bbd0bd98a8e70da74e0285 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Wed, 19 Mar 2008 17:01:08 -0700 Subject: [PATCH] revert "clocksource: make clocksource watchdog cycle through online CPUs" Revert commit 1ada5cba6a0318f90e45b38557e7b5206a9cba38 ("clocksource: make clocksource watchdog cycle through online CPUs") due to the regression reported by Gabriel C at http://lkml.org/lkml/2008/2/24/281 (short vesion: it makes TSC be marked as always unstable on his machine). Cc: Andi Kleen Acked-by: Ingo Molnar Cc: Thomas Gleixner Cc: Robert Hancock Acked-by: Linus Torvalds Cc: "Rafael J. Wysocki" Cc: Gabriel C Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- kernel/time/clocksource.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c index 548c436a776b..278534bbca95 100644 --- a/kernel/time/clocksource.c +++ b/kernel/time/clocksource.c @@ -141,13 +141,8 @@ static void clocksource_watchdog(unsigned long data) } if (!list_empty(&watchdog_list)) { - /* 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); + __mod_timer(&watchdog_timer, + watchdog_timer.expires + WATCHDOG_INTERVAL); } spin_unlock(&watchdog_lock); } @@ -169,7 +164,7 @@ static void clocksource_check_watchdog(struct clocksource *cs) if (!started && watchdog) { watchdog_last = watchdog->read(); watchdog_timer.expires = jiffies + WATCHDOG_INTERVAL; - add_timer_on(&watchdog_timer, first_cpu(cpu_online_map)); + add_timer(&watchdog_timer); } } else { if (cs->flags & CLOCK_SOURCE_IS_CONTINUOUS) @@ -190,8 +185,7 @@ static void clocksource_check_watchdog(struct clocksource *cs) watchdog_last = watchdog->read(); watchdog_timer.expires = jiffies + WATCHDOG_INTERVAL; - add_timer_on(&watchdog_timer, - first_cpu(cpu_online_map)); + add_timer(&watchdog_timer); } } } -- 2.20.1