linux-kernel - Re: Programatically modifying .config

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Message-ID: <dc516534-a102-ea52-8d8c-00086075e627@infradead.org>
Date:   Tue, 16 May 2017 17:31:17 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Pavel Machek <pavel@....cz>, Drew DeVault <sir@...wn.com>
Cc:     linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Re: Programatically modifying .config

On 05/16/17 03:57, Pavel Machek wrote:
> On Sun 2017-03-12 16:38:02, Drew DeVault wrote:
>> I'm in the research stage of making it so something to the effect of
>> `make setconfig OPTION="CONFIG_E100E=y"` will work, bringing it up here
>> for some discussion first.
>>
>> Digging into the kconfig code, this seems feasible, but complicated. A
>> simple solver of some sort will be necessary to make the Depends expr
>> true, and this tool would also have to hit up the Selects and Implies
>> lines.
>>
>> I expect there will be edge cases that this tool can't cope with, and
>> I'm okay with just letting that be the case.
>>
>> Any thoughts?
> 
> You can prepend (or append?) desired config option to .config, then
> run make oldconfig. And yes, script for automatically modifying
> .config would be nice... as would be script to automatically do
> "configuration bisect" (because some bugs are config dependend and
> nasty).


tools/testing/ktest/ktest.pl has some support for config bisecting.
(I have not tried it.)


-- 
~Randy