linux-kernel - Re: [PATCH] mfd: remove redundant 'default n' from Kconfig

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Date:   Fri, 12 Oct 2018 14:08:50 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mfd: remove redundant 'default n' from Kconfig


On 10/11/2018 07:48 AM, Lee Jones wrote:
> On Wed, 10 Oct 2018, Bartlomiej Zolnierkiewicz wrote:
> 
>> 'default n' is the default value for any bool or tristate Kconfig
>> setting so there is no need to write it explicitly.
>>
>> Also since commit f467c5640c29 ("kconfig: only write '# CONFIG_FOO
>> is not set' for visible symbols") the Kconfig behavior is the same
>> regardless of 'default n' being present or not:
>>
>>     ...
>>     One side effect of (and the main motivation for) this change is making
>>     the following two definitions behave exactly the same:
>>     
>>         config FOO
>>                 bool
>>     
>>         config FOO
>>                 bool
>>                 default n
>>     
>>     With this change, neither of these will generate a
>>     '# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied).
>>     That might make it clearer to people that a bare 'default n' is
>>     redundant.
>>     ...
>>
>> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
>> ---
>>  drivers/mfd/Kconfig |    6 ------
>>  1 file changed, 6 deletions(-)
> 
> The change looks okay to me, but I would also like you to include the
> Maintainers/Reviewers for the affected source files.

Could you please explain in more details what do you mean?

The only affected source file is drivers/mfd/Kconfig:

$ ./scripts/get_maintainer.pl -f drivers/mfd/Kconfig 
Lee Jones <lee.jones@...aro.org> (supporter:MULTIFUNCTION DEVICES (MFD))
linux-kernel@...r.kernel.org (open list)

> Also, I assume you are not just submitting these changes to the MFD
> subsystem.  My suggesting is to change each subsystem per patch (as
> you have done here), and submit them in one patch-set with each of the
> subsystem Maintainers included, so each of us has some visibility into
> how the general idea is being received.

The general idea is trivial - remove redundant "default n" from Kconfig
files and as a result cut ~700 LOC kernel wide. I assume that this is so
trivial change that there is no need for longer deliberations.

Also I'm sorry but I simply cannot invest few days straight in preparing
the full patchset. OTOH investing few minutes a day or a week is fine so
this is why I'm doing this change incrementally.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics