Re: [PATCH v4 3/3] qspinlock, x86: Add x86 specific optimization for 2 contending tasks

[Peter Zijlstra]

On Mon, Feb 17, 2014 at 03:41:24PM -0500, Waiman Long wrote:
> +	struct {
> +		u8  lock;	/* Lock bit	*/
> +		u8  wait;	/* Waiting bit	*/
> +		u16 qcode;	/* Queue code	*/
> +	};

16 bit code would result in 14 bits for the CPU number, that's only 16k,
I think SGI actually had a machine with that many CPUs in.

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