Re: [PATCH V2 2/3] perf/x86/intel/bm.c: Add Intel Branch Monitoring support

[Peter Zijlstra]

On Fri, Nov 17, 2017 at 05:54:05PM -0800, Megha Dey wrote:
> +	mutex_lock(&bm_counter_mutex);
> +	for (i = 0; i < BM_MAX_COUNTERS; i++) {
> +		if (bm_counter_owner[i] == NULL) {
> +			counter_to_use = i;
> +			bm_counter_owner[i] = event;
> +			break;
> +		}
> +	}
> +	mutex_unlock(&bm_counter_mutex);
> +
> +	if (counter_to_use == -1)
> +		return -EBUSY;

> +static struct pmu intel_bm_pmu = {
> +	.task_ctx_nr     = perf_sw_context,
> +	.attr_groups     = intel_bm_attr_groups,
> +	.event_init      = intel_bm_event_init,
> +	.add             = intel_bm_event_add,
> +	.del             = intel_bm_event_del,
> +};

Still horrid.. still no.