From 1b054b67d3bfc6dca9f634c104780f3f24ff3eec Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Fri, 3 Jun 2011 11:13:33 +0200 Subject: [PATCH] clockevents: Handle empty cpumask gracefully For UP it's stupid to request an initialized cpumask for the clock event devices. Though we need the mask set even on UP to avoid a horrible ifdeffery especially in the broadcast code. For SMP we can at least try to survive with a warning and set the cpumask of the cpu we're running on. That gives a decent chance to bring the machine up and retrieve the debug info. Signed-off-by: Thomas Gleixner Cc: Linus Walleij Cc: Russell King - ARM Linux Cc: Stephen Boyd --- kernel/time/clockevents.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c index c027d4f602f1..e4c699dfa4e8 100644 --- a/kernel/time/clockevents.c +++ b/kernel/time/clockevents.c @@ -182,7 +182,10 @@ void clockevents_register_device(struct clock_event_device *dev) unsigned long flags; BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED); - BUG_ON(!dev->cpumask); + if (!dev->cpumask) { + WARN_ON(num_possible_cpus() > 1); + dev->cpumask = cpumask_of(smp_processor_id()); + } raw_spin_lock_irqsave(&clockevents_lock, flags); -- 2.30.2