linux-kernel - Re: [PATCH] mmc: Change the enhanced area related sysfs output format

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Message-ID: <575FDE1B.2090206@intel.com>
Date:	Tue, 14 Jun 2016 13:36:11 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Wolfram Sang <wsa@...-dreams.de>,
	Beata Baranowska <beatax.baranowska@...el.com>
Cc:	ulf.hansson@...aro.org, aisheng.dong@....com,
	wsa+renesas@...g-engineering.com, gwendal@...omium.org,
	chaotian.jing@...iatek.com, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org, sebastianx.jarosz@...el.com,
	Chuanxiao Dong <chuanxiao.dong@...el.com>
Subject: Re: [PATCH] mmc: Change the enhanced area related sysfs output format

On 14/06/16 13:12, Wolfram Sang wrote:
> On Tue, Jun 14, 2016 at 10:33:06AM +0200, Beata Baranowska wrote:
>> From: Chuanxiao Dong <chuanxiao.dong@...el.com>
>>
>> When the enhanced area feature was not enabled, the related sysfs will 
>> have -EINVAL(-22) value, so change the sysfs output format to display 
>> the correct value.
>>
>> Signed-off-by: Chuanxiao Dong <chuanxiao.dong@...el.com>
> 
> What about introducing attribute_group an use the is_visible callback
> there, so they won't get displayed at all?
> 

Except that it is an ABI:

	Documentation/ABI/testing/sysfs-devices-mmc