Re: [RFC PATCH v2] mmc-utils: host_caps: Add parser to read host capabilities

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On 6 March 2018 at 13:45, Harish Jenny K N <harish_kandiga@xxxxxxxxxx> wrote:
>
>
> On Monday 05 March 2018 09:02 PM, Ulf Hansson wrote:
>>
>>>>
>>>>
>>>> Sorry, but this doesn't work. We may very well be changing the bit
>>>> offsets for the caps and caps2 in the mmc kernel header, keeping a
>>>> copy of them is not a good idea. It's just a matter of *when* it will
>>>> break.
>>>
>>> I guess we could create a header file under include/uapi? This's how
>>> other drivers, for instance, tty, PCI or graphic subsystem to keep user
>>> space consistent with kernel side.
>> Well, yes, for cases where this about providing a userspace ABI.
>>
>> This is about debugfs, which don't have this constraint. We may decide
>> to break/drop/change any debugfs support, whenever we want.
>>
>> So, overall, no I don't like it. If this were about the mmc ioctl or
>> the sysfs nodes, then yes.
>
> Can I move the parsing logic to kernel, by creating file using debugfs_create_file for caps and caps2 instead of debugfs_create_x32 ? This would mean no need of parsing in mmc-utils.

That seems like a better idea!

Although, having one debugs file should be sufficient, just
print/parse both caps and caps2 from within then same debugfs
function.

Kind regards
Uffe
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