On Monday 03 April 2006 07:15, Paul Jackson wrote:
> - for (cpu = 0; cpu < NR_CPUS; cpu++) {
> + for_each_online_cpu(cpu) {
>
> Idle curiosity -- what keeps a cpu from going offline during
> this scan, and leaving us with the same crash as before?
CPU hotdown uses RCU like techniques to avoid this. Only potential
problem could be on a preemptive kernel, but I hope nobody tries
cpu unplug on such a beast. The later could be probably fixed
with a rcu_read_lock() or somesuch.
-Andi
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