Re: [RFC] Cancellable MCS spinlock rework

[Linus Torvalds]

On Thu, Jul 3, 2014 at 8:31 AM, Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> I don't think we'll support 2 _billion_ processes/threads waiting on
> the same semaphore any time soon, so the 'long' seems a bit of an
> overkill on 64-bit architectures.

Oh, never mind. The 'struct semaphore' uses it as just a plain count,
but the rwsem ends up splitting up the bits for readers/writers, so we
actually do want the full 64-bit value there.

             Linus
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