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

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Date:	Sun, 16 Jan 2011 15:14:55 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Stefan Richter <stefanr@...6.in-berlin.de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.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 00:06 +0100, Stefan Richter wrote:
> On Jan 16 Nicholas A. Bellinger wrote:
> > On Sun, 2011-01-16 at 14:11 +0100, Stefan Richter wrote:
> > > On Jan 15 Nicholas A. Bellinger wrote:
> > > > This patch changes configfs to select SYSFS to fix the following:
> > > > 
> > > > warning: (TARGET_CORE && GFS2_FS) selects CONFIGFS_FS which has unmet direct dependencies (SYSFS)
> > > 
> > > Why don't you fix target-core's Kconfig instead?
> > 
> > The thought here was that since modern configfs is mounted
> > at /sys/kernel/config/, selecting SYSFS by default when building
> > CONFIGFS_FS made the most sense for existing configfs consumers.
> 
> I for one think that layered "select" directives will open too many cans
> of worms.
> 
> Best don't use select at all.
> 
> If you use it, select only options that don't depend on anything else.
> 
> If you feel that people really want you to provide a select for them which
> selects something that in turn depends on other things, then I suggest you
> rather let your own option depend on these lower dependencies:
> 
> config HIGHLEVEL_FEATURE
> 	tristate "some driver"
> 	depends on SYSFS  # because CONFIGFS depends on it
> 	select CONFIGFS

I think this is a fair point..  As I don't really have a strong
preference either way, I will have to defer to Randy and Joel's better
judgement here.  Guys, what would you prefer..?

Thanks,

--nab

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