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Date: Wed, 14 Mar 2007 17:59:36 +0000
From: Al Viro <viro@ftp.linux.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>,
       linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 13/13] fix ps3fb glue allowing a modular build
Message-ID: <20070314175936.GM4095@ftp.linux.org.uk>
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On Wed, Mar 14, 2007 at 10:30:31AM -0700, Linus Torvalds wrote:
> > Nope.  How can kconfig distinguish that from a boolean option in modular
> > driver?  bool *can* depend on tristate and be selected when tristate is
> > set to m.
> 
> Btw, this is one of those things that easily causes problems.
> 
> In many ways it would be nice if we had two different kinds of "bool": one 
> where "m" in the dependency chain means "y" is ok, and one where "m" means 
> "n".

*nod*

> Maybe not "bool" vs "mbool", but it might be nice to have
> 
> 	bool FB_PS3
> 		depends strictly on FB
> 
> ie a "depends strictly" refuses to upgrade a bool dependency from "m" to 
> "y", while a regular depends allows it.
> 
> Or something.. The "depends strictly on X" thing would really be just a 
> mental shorthand for "depends on (X)=y" (it's actually longer to type, but 
> I think it's a bit more intuitive, thus "mental shortcut").

There's a fun side question, though: what should allmodconfig do?  FB=m,
FB_PS3=n?  Or FB=y, FB_PS3=y?