linux-kernel - Re: [RFC] kobject/kset/ktype documentation and example code updated

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Message-ID: <Pine.LNX.4.44L0.0712201741570.29911-100000@netrider.rowland.org>
Date:	Thu, 20 Dec 2007 17:57:42 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Greg KH <greg@...ah.com>
cc:	Randy Dunlap <randy.dunlap@...cle.com>,
	<linux-kernel@...r.kernel.org>, Kay Sievers <kay.sievers@...y.org>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [RFC] kobject/kset/ktype documentation and example code updated

On Thu, 20 Dec 2007, Greg KH wrote:

> > >  - A ktype is the type of object that embeds a kobject. Every structure
> > >    that embeds a kobject needs a corresponding ktype.  The ktype controls
> > >    what happens when a kobject is no longer referenced and the kobject's
> > >    default representation in sysfs.
> > 
> > I can't quite parse the last sentence above.  Is it:
> > 
> > The ktype controls (a) what happens ...
> > and (b) the kobject's default representation in sysfs.
> > 
> > ?
> 
> How about:
> 	- A ktype is the type of object that embeds a kobject.  Every
> 	  structure that embeds a kobject needs a corresponding ktype.
> 	  The ktype controls what happens to the kobject when it is
> 	  created and destroyed.

I still don't like it.  How about being a little more explicit:

	A ktype controls certain operations for structures with 
	embedded kobjects.  For example, if struct foo contains an 
	embedded kobject member then there should be a foo_ktype object 
	with pointers to the methods for struct foo's.  These methods
	control what happens when the kobject embedded in a struct foo
	is added or destroyed.  Every time a new struct foo is created, 
	&foo_ktype would be passed as the ktype argument in the 
	kobject_init() call for the structure's embedded kobject.  
	Each type of structure (not just foo!) with an embedded kobject 
	needs to have its own corresponding ktype object.

Alan Stern

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