On Tue, Jul 15, 2014 at 04:58:53PM +0800, Yan, Zheng wrote:
> +void perf_sched_cb_disable(struct pmu *pmu)
> +{
> +	this_cpu_dec(perf_sched_cb_usages);
> +}
> +
> +void perf_sched_cb_enable(struct pmu *pmu)
> +{
> +	this_cpu_inc(perf_sched_cb_usages);
> +}

Still wrong names, they do not enable/disable. Enable/disable is a
strictly boolean thing, this is counting.