linux-kernel - Re: [PATCH] kbuild: document recursive dependency limitation / resolution

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Message-ID: <20150923154809.GC18173@wotan.suse.de>
Date:	Wed, 23 Sep 2015 17:48:09 +0200
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>, mmarek@...e.com,
	josh@...htriplett.org, jbottomley@...n.com, geert@...ux-m68k.org,
	pebolle@...cali.nl, herbert@...dor.apana.org.au, tiwai@...e.de,
	yann.morin.1998@...e.fr, corbet@....net,
	linux-kbuild@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, roberto@...osmo.org, zack@...ilon.cc
Subject: Re: [PATCH] kbuild: document recursive dependency limitation /
 resolution

On Wed, Jul 29, 2015 at 01:34:50PM -0700, Randy Dunlap wrote:
> On 07/29/15 13:09, Luis R. Rodriguez wrote:
> > +
> > +Kconfig recursive dependency limitations
> > +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > +
> > +If you've hit the Kconfig error: "recursive dependency detected" you've run
> > +into a recursive dependency issue with Kconfig. Kconfig does not do recursive
> > +dependency resolution, this has a few implications for Kconfig file writers. In
> 
> maybe                 s/,/;/

Fixed.

> > +practice it means that for instance if a driver A selects a few kconfig symbols
> > +another driver B which selects any of these symbols cannot negate any of the
> > +symbols the driver A selected.  Because of this current limitation developers
> > +who run into this type of recursive dependency issue have two diverging
> > +options:
> > +
> > +  a) Either swap all "select FOO" to "depends on FOO" or,
> > +  b) Change the offending "depends on FOO" to "select FOO"
> > +
> > +Kconfig's limitations can be addressed by implementing a SAT solver for it,
> > +but until then, Kconfig is limitted to require developers to use one of
> 
>                               limited
> 

I've re-written this section, thanks for the review.

  Luis
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