linux-kernel - Re: [PATCH v9 3/4] perf: xgene: Add APM X-Gene SoC Performance Monitoring Unit driver

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Date:	Thu, 14 Jul 2016 10:47:08 -0700
From:	Joe Perches <joe@...ches.com>
To:	Tai Nguyen <ttnguyen@....com>, mark.rutland@....com,
	will.deacon@....com, catalin.marinas@....com,
	paul.gortmaker@...driver.com
Cc:	dhdang@....com, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	patches@....com
Subject: Re: [PATCH v9 3/4] perf: xgene: Add APM X-Gene SoC Performance
 Monitoring Unit driver

On Thu, 2016-07-14 at 10:27 -0700, Tai Nguyen wrote:
> This patch adds a driver for the SoC-wide (AKA uncore) PMU hardware
> found in APM X-Gene SoCs.

trivia:

> diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
[]
> +struct xgene_pmu_dev_ctx {
> +	char *name;
> +	struct list_head next;
> +	struct xgene_pmu_dev *pmu_dev;
> +	struct hw_pmu_info inf;
> +};

Probably better to use something like
	char	name[20];
as the kasprintf can fail and this doesn't
seem to be freed anywhere.
> +static char *xgene_pmu_dev_name(u32 type, int id)
> +{
> +	switch (type) {
> +	case PMU_TYPE_L3C:
> +		return kasprintf(GFP_KERNEL, "l3c%d", id);
> +	case PMU_TYPE_IOB:
> +		return kasprintf(GFP_KERNEL, "iob%d", id);
> +	case PMU_TYPE_MCB:
> +		return kasprintf(GFP_KERNEL, "mcb%d", id);
> +	case PMU_TYPE_MC:
> +		return kasprintf(GFP_KERNEL, "mc%d", id);
> +	default:
> +		return kasprintf(GFP_KERNEL, "unknown");
> +	}
> +}

[]
	
> +static struct
> +xgene_pmu_dev_ctx *acpi_get_pmu_hw_inf(struct xgene_pmu *xgene_pmu,
> +				       struct acpi_device *adev, u32 type)
> +{
[]
> +	ctx->name = xgene_pmu_dev_name(type, enable_bit);
>