Re: [RFC] Cancellable MCS spinlock rework

[Linus Torvalds]

On Wed, Jul 2, 2014 at 9:39 PM, Jason Low <jason.low2@xxxxxx> wrote:
>
> And due to padding, the additional modification below reduces the
> size of struct rw_semaphore by 64 bits on my machine  :)

Well, I think you could also make 'count' just be 'int' instead of 'long'.

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.

          Linus.
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