linux-kernel - Re: [RFC PATCH 15/20] coresight: etm-perf: implementing 'setup

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Date:	Wed, 30 Sep 2015 14:50:41 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Mathieu Poirier <mathieu.poirier@...aro.org>,
	gregkh@...uxfoundation.org, a.p.zijlstra@...llo.nl,
	acme@...nel.org, mingo@...hat.com, corbet@....net
Cc:	adrian.hunter@...el.com, zhang.chunyan@...aro.org,
	mike.leach@....com, tor@...com, al.grant@....com,
	pawel.moll@....com, linux-arm-kernel@...ts.infradead.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 15/20] coresight: etm-perf: implementing 'setup_aux()' API

Mathieu Poirier <mathieu.poirier@...aro.org> writes:

> +static void *etm_setup_aux(int cpu, void **pages,
> +			      int nr_pages, bool overwrite)
> +{
> +	struct coresight_device *csdev;
> +
> +	if (cpu == -1)
> +		cpu = smp_processor_id();
> +
> +	csdev = per_cpu(csdev_sink, cpu);
> +	if (!csdev)
> +		return NULL;
> +
> +	return sink_ops(csdev)->setup_aux(csdev, cpu, pages,
> +					  nr_pages, overwrite);

Is it guaranteed that this sink would always have .setup_aux()?

Regards,
--
Alex
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