linux-kernel - Re: [PATCH 1/4] perf/arm_cspmu: Fix event attribute type

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Message-ID: <cd2b7a77-aacf-363c-3ade-59646736d8db@os.amperecomputing.com>
Date:   Mon, 5 Jun 2023 00:29:55 -0700 (PDT)
From:   Ilkka Koskinen <ilkka@...amperecomputing.com>
To:     Robin Murphy <robin.murphy@....com>
cc:     will@...nel.org, mark.rutland@....com, suzuki.poulose@....com,
        bwicaksono@...dia.com, ilkka@...amperecomputing.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] perf/arm_cspmu: Fix event attribute type



On Thu, 1 Jun 2023, Robin Murphy wrote:
> ARM_CSPMU_EVENT_ATTR() defines a struct perf_pmu_events_attr, so
> arm_cspmu_sysfs_event_show() should not be interpreting it as struct
> dev_ext_attribute.
>
> Fixes: e37dfd65731d ("perf: arm_cspmu: Add support for ARM CoreSight PMU driver")
> Signed-off-by: Robin Murphy <robin.murphy@....com>

Reviewed-and-tested-by: Ilkka Koskinen <ilkka@...amperecomputing.com>

> ---
> drivers/perf/arm_cspmu/arm_cspmu.c | 8 ++++----
> 1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/perf/arm_cspmu/arm_cspmu.c b/drivers/perf/arm_cspmu/arm_cspmu.c
> index a3f1c410b417..72dc7a9e1ca8 100644
> --- a/drivers/perf/arm_cspmu/arm_cspmu.c
> +++ b/drivers/perf/arm_cspmu/arm_cspmu.c
> @@ -189,10 +189,10 @@ static inline bool use_64b_counter_reg(const struct arm_cspmu *cspmu)
> ssize_t arm_cspmu_sysfs_event_show(struct device *dev,
> 				struct device_attribute *attr, char *buf)
> {
> -	struct dev_ext_attribute *eattr =
> -		container_of(attr, struct dev_ext_attribute, attr);
> -	return sysfs_emit(buf, "event=0x%llx\n",
> -			  (unsigned long long)eattr->var);
> +	struct perf_pmu_events_attr *pmu_attr;
> +
> +	pmu_attr = container_of(attr, typeof(*pmu_attr), attr);
> +	return sysfs_emit(buf, "event=0x%llx\n", pmu_attr->id);
> }
> EXPORT_SYMBOL_GPL(arm_cspmu_sysfs_event_show);
>
> -- 
> 2.39.2.101.g768bb238c484.dirty
>
>