linux-kernel - Re: [PATCH 1/2] sysfs: Add helper BIN_ATTRIBUTE

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Date:   Wed, 19 May 2021 21:02:47 +0200
From:   Heiner Kallweit <hkallweit1@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] sysfs: Add helper BIN_ATTRIBUTE_GROUPS

On 19.05.2021 19:04, Greg Kroah-Hartman wrote:
> On Wed, May 19, 2021 at 06:33:14PM +0200, Heiner Kallweit wrote:
>> New helper BIN_ATTRIBUTE_GROUPS() does the same as ATTRIBUTE_GROUPS(),
>> just for binary attributes.
>>
>> Signed-off-by: Heiner Kallweit <hkallweit1@...il.com>
>> ---
>>  include/linux/sysfs.h | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/include/linux/sysfs.h b/include/linux/sysfs.h
>> index d76a1ddf8..a12556a4b 100644
>> --- a/include/linux/sysfs.h
>> +++ b/include/linux/sysfs.h
>> @@ -162,6 +162,12 @@ static const struct attribute_group _name##_group = {		\
>>  };								\
>>  __ATTRIBUTE_GROUPS(_name)
>>  
>> +#define BIN_ATTRIBUTE_GROUPS(_name)				\
>> +static const struct attribute_group _name##_group = {		\
>> +	.bin_attrs = _name##_attrs,				\
>> +};								\
>> +__ATTRIBUTE_GROUPS(_name)
> 
> Is this really needed by more than just 1 driver?
> 
Few more use case I saw:
devcd_dev_groups in drivers/base/devcoredump.c
w1_f3a_group in drivers/w1/slaves/w1_ds2413.c
w1_slave_default_groups in drivers/w1/w1.c

> How about just "open code" this for now, binary sysfs files are rare.
> 
> thanks,
> 
> greg k-h
> 
Heiner