Re: [Xen-devel] [PATCH v9 05/19] qspinlock: Optimize for smaller NR_CPUS

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

On Thu, Apr 17, 2014 at 11:03:57AM -0400, Waiman Long wrote:
> @@ -48,6 +53,9 @@
>   * We can further change the first spinner to spin on a bit in the lock word
>   * instead of its node; whereby avoiding the need to carry a node from lock 
> to
>   * unlock, and preserving API.
> + *
> + * N.B. The current implementation only supports architectures that allow
> + *      atomic operations on smaller 8-bit and 16-bit data types.
>   */

Only for the _Q_PENDING_BITS == 8 case, the other case should still be
fine.

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