Re: [PATCH v4 3/6] powerpc/fadump: reorganize /sys/kernel/fadump_* sysfs files

[Sourabh Jain]

On 12/6/19 6:15 PM, Greg KH wrote:
> On Fri, Dec 06, 2019 at 05:54:31PM +0530, Sourabh Jain wrote:
>> +static struct kobj_attribute release_attr = __ATTR(release_mem,
>>                                              0200, NULL,
>>                                              fadump_release_memory_store);
>> -static struct kobj_attribute fadump_attr = __ATTR(fadump_enabled,
>> +static struct kobj_attribute enable_attr = __ATTR(enabled,
>>                                              0444, fadump_enabled_show,
>>                                              NULL);
> 
> __ATTR_RO()?
> 
>> -static struct kobj_attribute fadump_register_attr = 
>> __ATTR(fadump_registered,
>> +static struct kobj_attribute register_attr = __ATTR(registered,
>>                                              0644, fadump_register_show,
>>                                              fadump_register_store);
> 
> __ATTR_RW()?

Thanks I was not aware of these macros.

> 
> And then use an ATTRIBUTE_GROUP() macro to create a group so that you
> then can do:
> 
>> @@ -1452,11 +1450,47 @@ static void fadump_init_files(void)
>>              printk(KERN_ERR "fadump: unable to create debugfs file"
>>                              " fadump_region\n");
>>  
>> +    rc = sysfs_create_file(fadump_kobj, &enable_attr.attr);
>> +    if (rc)
>> +            pr_err("unable to create enabled sysfs file (%d)\n",
>> +                   rc);
>> +    rc = sysfs_create_file(fadump_kobj, &register_attr.attr);
>> +    if (rc)
>> +            pr_err("unable to create registered sysfs file (%d)\n",
>> +                   rc);
>> +    if (fw_dump.dump_active) {
>> +            rc = sysfs_create_file(fadump_kobj, &release_attr.attr);
>> +            if (rc)
>> +                    pr_err("unable to create release_mem sysfs file (%d)\n",
>> +                           rc);
>> +    }
> 
> a single call to sysfs_create_groups() here instead of trying to unwind
> the mess if something went wrong.
> 

Sure, I will replace the individual calls with a single group call.

Thanks,
Sourabh Jain