linux-kernel - Re: [PATCH V2] drivers: CCI: fix used_mask init in validate

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Date:	Thu, 9 Apr 2015 16:36:29 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Mark Salter <msalter@...hat.com>
Cc:	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Punit Agrawal <punit.agrawal@....com>, suzuki.poulose@....com,
	arm@...nel.org
Subject: Re: [PATCH V2] drivers: CCI: fix used_mask init in validate_group()

On Thu, Apr 09, 2015 at 03:57:05PM +0100, 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.
> 
> Signed-off-by: Mark Salter <msalter@...hat.com>

Reviewed-by: Mark Rutland <mark.rutland@....com>

Arnd, Olof, are you happy to take this via arm-soc?

My (broken) patch went via Will's tree because of a perf dependency, but
other CCI patches have gone via you guys.

Thanks,
Mark.

> ---
>  drivers/bus/arm-cci.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
> index 84fd660..759e41c 100644
> --- a/drivers/bus/arm-cci.c
> +++ b/drivers/bus/arm-cci.c
> @@ -684,7 +684,7 @@ validate_group(struct perf_event *event)
>  		 * Initialise the fake PMU. We only need to populate the
>  		 * used_mask for the purposes of validation.
>  		 */
> -		.used_mask = CPU_BITS_NONE,
> +		.used_mask = { 0 },
>  	};
>  
>  	if (!validate_event(&fake_pmu, leader))
> -- 
> 1.8.3.1
> 
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