[PATCH] powerpc: avoid timer interrupt replay effect when onlining cpu
When a cpu is hotplug-onlined, if we don't set per_cpu(last_jiffy) to something sane, timer_interrupt will execute its while loop for every tick missed since the cpu was last online (or since the system was booted, if we're adding a new cpu). This can cause weird hangs, ssh sessions dropping, and we can even go xmon if we take a global IPI at the wrong time. Signed-off-by: Nathan Lynch <ntl@pobox.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
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@ -540,6 +540,9 @@ int __devinit start_secondary(void *unused)
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if (smp_ops->take_timebase)
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smp_ops->take_timebase();
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if (system_state > SYSTEM_BOOTING)
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per_cpu(last_jiffy, cpu) = get_tb();
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spin_lock(&call_lock);
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cpu_set(cpu, cpu_online_map);
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spin_unlock(&call_lock);
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