linux-kernel - Re: [PATCH] configfs: change depends -> select SYSFS

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Date:	Mon, 17 Jan 2011 12:16:53 +0100
From:	Bernd Petrovitsch <bernd@...rovitsch.priv.at>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Joel Becker <jlbec@...lplan.org>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	James Bottomley <James.Bottomley@...e.de>
Subject: Re: [PATCH] configfs: change depends -> select SYSFS

On Mon, 2011-01-17 at 01:52 +0100, Stefan Richter wrote:
[...] 
> We already have different UIs.  But perhaps we have too much UI down in
> the Kconfig files.  I.e., perhaps Kconfig shouldn't know the difference

IOMHO not really.

> between depends-on and select.  Let the different UIs present the

The UI should know the difference as it should guide/force the user -
especially the less experienced ones which aren't expected to know every
bit of hardware and kernel-internal stuff (as in "do I need gzip
compression?").

And there are two (IMHO very) different semantics:
- select: enables/activates/includes necessary other parts (like the
  "gzip compression" example from above and other library-like).
- depends on: to purposely disable knobs because it makes no sense to
  configure e.g. ext-specific stuff if I don't have/want ext or because
  the physical hardware is not present/available (find more and better
  in Al Viros mail of course).

> dependency graph to the operator in different ways, suitable to different
> tasks.

That would be quite cute.

> /handwave off.
AOL.
Bernd
-- 
Bernd Petrovitsch                  Email : bernd@...rovitsch.priv.at
                     LUGA : http://www.luga.at

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