linux-kernel - Re: [RFC] Simplifying kernel configuration for distro issues

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Message-ID: <20120720102644.GA23636@merkur.ravnborg.org>
Date:	Fri, 20 Jul 2012 12:26:44 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Dave Jones <davej@...hat.com>,
	Greg Kroah-Hartman <greg@...ah.com>,
	Ubuntu Kernel Team <kernel-team@...ts.ubuntu.com>,
	Debian Kernel Team <debian-kernel@...ts.debian.org>,
	OpenSUSE Kernel Team <opensuse-kernel@...nsuse.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Simplifying kernel configuration for distro issues

> 
> But we'll first have to make 'select' to actually work, right? It 
> currently doesn't resolve the dependencies of the selected configs, so it 
> will just produce some very broken config.

We could restrict "select" to only select symbols with no dependencies,
or *exactly* the same dependencies as the symbol containing the select.

So we could have something like:

config FEDORA
	select WANT_TMPFS

config WANT_TMPFS
	bool

config TMPFS
	defbool y if WANT_TMPFS

This is a pattern used today in many places.
But fixing up all the current select XXX would not be trivial...
I have no idea how many of the select we have today that would fail
the above semantic restrictions - but I guess it is a lot.

We could also come up with something new like:

config FEDORA
	require TMPFS
	require EXT4 = m
	require EXT3 = y

This would set TMPS to y if TMPFS dependencies are met.
And EXT3 to y and EXT4 to m if their dependencies are met.

This should be more or less the same as setting the value to y/m
in the user interface, which is only possible if the value is visible.

	Sam
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