linux-kernel - Re: [PATCH v2 1/7] ARM: perf_event: Support percpu irqs for the CPU PMU

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Message-ID: <20140115205427.GB26193@codeaurora.org>
Date:	Wed, 15 Jan 2014 12:54:27 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Will Deacon <will.deacon@....com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/7] ARM: perf_event: Support percpu irqs for the
 CPU PMU

On 01/15, Stephen Boyd wrote:
> diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
> index 789d846a9184..e76750980b38 100644
> --- a/arch/arm/kernel/perf_event.c
> +++ b/arch/arm/kernel/perf_event.c
> @@ -295,9 +297,15 @@ validate_group(struct perf_event *event)
>  
>  static irqreturn_t armpmu_dispatch_irq(int irq, void *dev)
>  {
> -	struct arm_pmu *armpmu = (struct arm_pmu *) dev;
> -	struct platform_device *plat_device = armpmu->plat_device;
> -	struct arm_pmu_platdata *plat = dev_get_platdata(&plat_device->dev);
> +	struct arm_pmu *armpmu;
> +	struct platform_device *plat_device;
> +	struct arm_pmu_platdata *plat;
> +
> +	if (irq_is_percpu(irq))
> +		dev = *(struct arm_pmu_cpu **)dev;

Oh. I just realized that struct arm_pmu_cpu doesn't even exist. This
still compiles though because we're dealing with a void pointer.

Perhaps its better to just do

	dev = *(void **)dev;

here. Can you fix that up when applying? Otherwise I'll do it on
the next send if there are more comments.

> +	armpmu = dev;
> +	plat_device = armpmu->plat_device;
> +	plat = dev_get_platdata(&plat_device->dev);
>  

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