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>
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@ -182,7 +182,10 @@ void clockevents_register_device(struct clock_event_device *dev)
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unsigned long flags;
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BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
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BUG_ON(!dev->cpumask);
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if (!dev->cpumask) {
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WARN_ON(num_possible_cpus() > 1);
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dev->cpumask = cpumask_of(smp_processor_id());
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}
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raw_spin_lock_irqsave(&clockevents_lock, flags);
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