linux-kernel - Re: [PATCH 4/9] perf: Generic intel uncore support

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Date:	Fri, 11 May 2012 12:01:04 +0530
From:	Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
CC:	a.p.zijlstra@...llo.nl, mingo@...e.hu, andi@...stfloor.org,
	eranian@...gle.com, jolsa@...hat.com, ming.m.lin@...el.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/9] perf: Generic intel uncore support

On Wednesday 02 May 2012 07:37 AM, Yan, Zheng wrote:

> +static int __cpuinit uncore_cpu_prepare(int cpu)
> +{
> +	struct intel_uncore_type *type;
> +	struct intel_uncore_pmu *pmu;
> +	struct intel_uncore_box *exist, *box;
> +	int i, j, phyid;
> +
> +	phyid = topology_physical_package_id(cpu);
> +
> +	/* allocate the box data structure */
> +	for (i = 0; msr_uncores[i]; i++) {
> +		type = msr_uncores[i];
> +		for (j = 0; j < type->num_boxes; j++) {
> +			exist = NULL;
> +			pmu = &type->pmus[j];
> +
> +			if (pmu->func_id < 0)
> +				pmu->func_id = j;
> +			exist = uncore_pmu_find_box(pmu, phyid);
> +			if (exist)
> +				exist->refcnt++;
> +			if (exist)
> +				continue;



May be a redundant condition checking ^ ?

> +
> +			box = uncore_alloc_box(cpu);
> +			if (!box)
> +				return -ENOMEM;
> +
> +			box->pmu = pmu;
> +			box->phy_id = phyid;
> +			uncore_pmu_add_box(pmu, box);
> +		}
> +	}
> +	return 0;


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