From: Rob Landley <rob@landley.net>
Organization: Boundaries Unlimited
To: linux-tiny@selenic.com
Subject: Re: Monster switch for small size (was Linux-tiny revival)
Date: Thu, 20 Sep 2007 16:41:22 -0500
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Cc: Tim Bird <tim.bird@am.sony.com>, Andy Whitcroft <apw@shadowen.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       linux kernel <linux-kernel@vger.kernel.org>,
       Michael Opdenacker <michael@free-electrons.com>,
       CE Linux Developers List <celinux-dev@tree.celinuxforum.org>
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On Thursday 20 September 2007 12:10:50 pm Tim Bird wrote:
> Andy Whitcroft wrote:
> > Knowing nothing about these options, from a test perspective it would
> > be nice if we were able to simply enable "the lot" so we can do "normal"
> > -mm runs and "tiny" -mm runs without any manual intervention?
>
> I agree completely.
>
> I have been thinking for a while about how to make a "monster switch"
> (the kind they always seem to have in Frankenstein movies) that
> switches a whole bunch of settings at once.  We currently have methods
> in the kernel for:
>  * default (or recommended) config for a particular platform
>  * all yes - to build as much as possible
>  * all no - to build as little as possible
>
> The problem with "allno" is that it rarely produces a usable
> kernel.

Beyond that, allno doesn't come close to switching everything off.

1) You have to _enable_ CONFIG_EMBEDDED in order to go into that menu and 
switch _off_ the stuff in there.

2) The stuff CONFIG_EMBEDDED reveals isn't all in that menu.  CONFIG_BLOCK is 
at the top level menu.  CONFIG_VT and CONFIG_UNIX98_PTYS are buried down 
under device drivers->character devices, and there's more sprinkled all over.  
You have to track it all down and switch it off to get an _actual_ 
allnoconfig kernel.

(I cut the bit where you reinvent miniconfig.  People keep doing this.  I dig 
it up and resubmit it every year or so, so Roman Zippel can shoot it down 
again.  Meanwhile, not only is Firmware Linux happily using it, but I even 
wrote more documentation at 
http://landley.net/code/firmware/new_platform.html although you have to 
scroll down a bit to get to the stuff about miniconfig...)

Rob
-- 
"One of my most productive days was throwing away 1000 lines of code."
  - Ken Thompson.
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