Re: [PATCH] hotplug: Optimize {get,put}_online_cpus()

[Peter Zijlstra]

On Tue, Oct 01, 2013 at 07:45:37AM -0700, Paul E. McKenney wrote:
> If you don't have cpuhp_seq, you need some other way to avoid
> counter overflow.  Which might be provided by limited number of
> tasks, or, on 64-bit systems, 64-bit counters.

How so? PID space is basically limited to 30 bits, so how could we
overflow a 32bit reference counter?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/