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

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Date:   Thu, 6 Jul 2017 10:23:36 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     Suzuki K Poulose <Suzuki.Poulose@....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.

Hi,


On Wednesday 05 July 2017 09:33 PM, Suzuki K Poulose wrote:
> 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, /*This can be const*/
>>  };
>>
>> -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.
>
     Yes, Your are right. It's filled at run time.
         pmu_event_attr_group.attrs = model->event_attrs;
         pmu_format_attr_group.attrs = model->format_attrs;
     can we make pmu_attr_group as const.? It's already initialized.
     If you are ok with this please let me know. I can push updated patch.


> Cheers
> Suzuki
>
Thanks,
Arvind Yadav