linux-kernel - Re: [PATCH] Kconfig: drop bogus default values

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Message-Id: <551122B4020000780006CD28@mail.emea.novell.com>
Date:	Tue, 24 Mar 2015 07:39:16 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Paul Bolle" <pebolle@...cali.nl>,
	"Martin Walch" <walch.martin@....de>
Cc:	<akpm@...ux-foundation.org>, "Sam Ravnborg" <sam@...nborg.org>,
	"Michal Marek" <mmarek@...e.cz>, <linux-kbuild@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Kconfig: drop bogus default values

>>> On 23.03.15 at 23:58, <walch.martin@....de> wrote:
> On Monday 23 March 2015 22:24:28 Paul Bolle wrote:
>> > A real world case is PCI_QUIRKS in the mainline kernel:
>> > 
>> > init/Kconfig:1554:	default y
>> > arch/s390/Kconfig:59:	def_bool n
>> > 
>> > When setting PCI!=n && EXPERT=n then on each architecture PCI_QUIRKS=y
>> > except on s390 where PCI_QUIRKS=n.
>> 
>> Good catch!
>> 
>> For the same effect, would it do to have
>>     config PCI_QUIRKS
>>         default y if !S390
>>         [...]
>> 
>> in init/Kconfig?
> 
> Basically yes (although I suppose the maintainer had a good reason for
> writing it the way it is now). But in the case with "def_bool n" in
> arch/s390/Kconfig, the default value is explicitly set to n, while
> "default y if !S390" does not set the value at all. As long as there are no
> further default lines for PCI_QUIRKS below, this leads to the same
> configuration. However if there was a third default line, then in the former
> case that third default value would be always ignored while in the latter
> case it would determine the default value on s390.

If the "n" default was really needed, it could be

config PCI_QUIRKS
         default !S390

Jan

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