linux-kernel - Re: [RFCv4 5/7] drivers/perf: arm

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Date:   Fri, 9 Sep 2016 12:04:50 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Will Deacon <will.deacon@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...nel.org, mingo@...hat.com, peterz@...radead.org
Subject: Re: [RFCv4 5/7] drivers/perf: arm_pmu: expose a cpumask in sysfs

On Fri, Sep 09, 2016 at 11:24:43AM +0100, Will Deacon wrote:
> On Thu, Sep 08, 2016 at 11:21:50AM +0100, Mark Rutland wrote:
> > +static ssize_t armpmu_cpumask_show(struct device *dev,
> > +				   struct device_attribute *attr, char *buf)
> > +{
> > +	struct arm_pmu *armpmu = to_arm_pmu(dev_get_drvdata(dev));
> > +	return cpumap_print_to_pagebuf(true, buf, &armpmu->supported_cpus);
> > +}
> > +
> > +static struct device_attribute armpmu_cpumask_attr =
> > +		__ATTR(cpus, S_IRUGO, armpmu_cpumask_show, NULL);
> 
> You can use the DEVICE_ATTR macro for this.

Ok. I've made use of this locally.

I'll send an updated version of the patches shortly, once I've given
this a spin on HW 

Mark.