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

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Message-ID: <552E40F6.1010504@arm.com>
Date:	Wed, 15 Apr 2015 11:44:06 +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 V2] drivers: CCI: fix used_mask init in validate_group()

On 09/04/15 15:57, 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>
> ---
>   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))
>
I have a series of patches to add CCI-500 PMU, targeting 4.2, which 
changes the used_mask to a pointer and changes it to depend on the 
number of counters available on the CCI PMU.  I will post it in very 
soon here, which could make this patch obsolete. Let me know if you 
don't mind getting this sorted out through my series. I am fine either way.

Regards
Suzuki

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