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 <tglx@linutronix.de>
Cc: Linus Walleij <linus.walleij@linaro.org
Cc: Lee Jones <lee.jones@linaro.org>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: Stephen Boyd <sboyd@codeaurora.org>

diff --git a/kernel/time/clockevents.c b/kernel/time/clockevents.c
index c027d4f..e4c699d 100644 (file)
--- 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);