I don't see any documented restrictions about preemption being
disabled when this function is called, but...
> +int on_one_cpu(int cpu, void (*func) (void *info), void *info,
> + int retry, int wait)
> +{
> + int ret;
> + int this_cpu;
> +
> + this_cpu = get_cpu();
what if a preempt and reschedule to a different CPU happens right
here, after this_cpu is set?
> + if (this_cpu == cpu) {
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