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

[Avi Kivity]

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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/