Re: [rfc: cpuops adv V1 3/8] x86: this_cpu_cmpxchg and this_cpu_cmpxchg_double operations

Avi Kivity
2010-12-06T17:15:41Z

On 12/02/2010 11:53 PM, Christoph Lameter wrote:
> Provide support as far as the hardware capabilities of the x86 cpus
> allow.
>
>
>
> +/*
> + * Beware: xchg on x86 has an implied lock prefix. There will be the cost of
> + * full lock semantics even though they are not needed.
> + */

Perhaps we can use cmpxchg instead of xchg to avoid this? costs one more
instruction but may be worth it.

--
error compiling committee.c: too many arguments to function