linux-kernel - Re: [PATCH] drivers: CCI: fix used_mask init in validate

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Message-ID: <55265D1E.8050700@arm.com>
Date:	Thu, 09 Apr 2015 12:06:06 +0100
From:	"Suzuki K. Poulose" <Suzuki.Poulose@....com>
To:	Mark Salter <msalter@...hat.com>, Will Deacon <Will.Deacon@....com>
CC:	Mark Rutland <Mark.Rutland@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] drivers: CCI: fix used_mask init in validate_group()

On 08/04/15 19:21, Mark Salter wrote:
> Currently in validate_group(), there is a static initializer
> for fake_pmu.used_mask which is based on CPU_BITS_NONE but
> the used_mask array size is based on CCI_PMU_MAX_HW_EVENTS.
> CCI_PMU_MAX_HW_EVENTS is not based on NR_CPUS, so CPU_BITS_NONE
> is not correct and will cause a build failure if NR_CPUS
> is set high enough to make CPU_BITS_NONE larger than used_mask.
> This patch changes the used_mask initialization to be runtime
> based on the actual size of the array.
>
> Signed-off-by: Mark Salter <msalter@...hat.com>
> ---
>   drivers/bus/arm-cci.c | 14 +++++++-------
>   1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
> index 84fd660..1d83072 100644
> --- a/drivers/bus/arm-cci.c
> +++ b/drivers/bus/arm-cci.c
> @@ -679,13 +679,13 @@ static int
>   validate_group(struct perf_event *event)
>   {
>   	struct perf_event *sibling, *leader = event->group_leader;
> -	struct cci_pmu_hw_events fake_pmu = {
> -		/*
> -		 * Initialise the fake PMU. We only need to populate the
> -		 * used_mask for the purposes of validation.
> -		 */
> -		.used_mask = CPU_BITS_NONE,
> -	};
> +	struct cci_pmu_hw_events fake_pmu;
> +
> +	/*
> +	 * Initialise the fake PMU. We only need to populate the
> +	 * used_mask for the purposes of validation.
> +	 */
> +	memset(fake_pmu.used_mask, 0, sizeof(fake_pmu.used_mask));
The patch looks good to me.

Reviewed-by: Suzuki K. Poulose <suzuki.poulose@....com>

Suzuki

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