linux-kernel - Re: [PATCH] bus: arm-cci: constify attribute

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Date:   Wed, 5 Jul 2017 17:03:11 +0100
From:   Suzuki K Poulose <Suzuki.Poulose@....com>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>, nico@...aro.org,
        mark.rutland@....com, mingo@...nel.org, lorenzo.pieralisi@....com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bus: arm-cci: constify attribute_group structures.

On 03/07/17 08:46, Arvind Yadav wrote:
> attribute_groups are not supposed to change at runtime. All functions
> working with attribute_groups provided by <linux/sysfs.h> work with const
> attribute_group. So mark the non-const structs as const.
>
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
> ---
>  drivers/bus/arm-cci.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/bus/arm-cci.c b/drivers/bus/arm-cci.c
> index c49da15..64c75d2 100644
> --- a/drivers/bus/arm-cci.c
> +++ b/drivers/bus/arm-cci.c
> @@ -1445,16 +1445,16 @@ static ssize_t pmu_cpumask_attr_show(struct device *dev,
>  	NULL,
>  };
>
> -static struct attribute_group pmu_attr_group = {
> +static const struct attribute_group pmu_attr_group = {
>  	.attrs = pmu_attrs,
>  };
>
> -static struct attribute_group pmu_format_attr_group = {
> +static const struct attribute_group pmu_format_attr_group = {
>  	.name = "format",
>  	.attrs = NULL,		/* Filled in cci_pmu_init_attrs */
>  };



>
> -static struct attribute_group pmu_event_attr_group = {
> +static const struct attribute_group pmu_event_attr_group = {
>  	.name = "events",
>  	.attrs = NULL,		/* Filled in cci_pmu_init_attrs */
>  };
>

I think we cannot make these const, as the attrs field gets filled in at runtime, indicated
by the comments next to them.

Cheers
Suzuki