linux-kernel - Re: [PATCH 1/2] thermal: int340x: constify attribute

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Date:   Mon, 17 Jul 2017 16:29:20 +0530
From:   Arvind Yadav <arvind.yadav.cs@...il.com>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        rui.zhang@...el.com, edubezval@...il.com
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] thermal: int340x: constify attribute_group
 structures.

Hi Andy,


On Monday 17 July 2017 04:11 PM, Andy Shevchenko wrote:
> On Mon, 2017-07-17 at 16:04 +0530, 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.
>>
> I hope you did compile test it.
     I have compiled it. If we will see  <linux/sysfs.h>
     "int sysfs_create_group(struct kobject *kobj,  const struct 
attribute_group *grp)" and
     "void sysfs_remove_group(struct kobject *kobj, const struct 
attribute_group *grp);"
     Here, passing parameter attribute_group are constant. So I have 
changed non-const as const.

     ~arvind
>
>> File size before:
>>     text	   data	    bss	    dec	    hex	
>> filename
>>     1687	    592	      0	   2279	    8e7	
>> int3400_thermal.o
>>
>> File size After adding 'const':
>>     text	   data	    bss	    dec	    hex	
>> filename
>>     1751	    528	      0	   2279	    8e7	
>> int3400_thermal.o
>>
>> Signed-off-by: Arvind Yadav <arvind.yadav.cs@...il.com>
>> ---
>>   drivers/thermal/int340x_thermal/int3400_thermal.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/thermal/int340x_thermal/int3400_thermal.c
>> b/drivers/thermal/int340x_thermal/int3400_thermal.c
>> index a9ec94e..b2ffbed 100644
>> --- a/drivers/thermal/int340x_thermal/int3400_thermal.c
>> +++ b/drivers/thermal/int340x_thermal/int3400_thermal.c
>> @@ -104,7 +104,7 @@ static ssize_t current_uuid_store(struct device
>> *dev,
>>   	NULL
>>   };
>>   
>> -static struct attribute_group uuid_attribute_group = {
>> +static const struct attribute_group uuid_attribute_group = {
>>   	.attrs = uuid_attrs,
>>   	.name = "uuids"
>>   };