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

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Date:	Wed, 28 Nov 2007 22:02:09 -0800
From:	Greg KH <greg@...ah.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Alan Stern <stern@...land.harvard.edu>,
	Jonathan Corbet <corbet@....net>,
	Randy Dunlap <randy.dunlap@...cle.com>
Subject: Re: [RFC] New kobject/kset/ktype documentation and example code

On Wed, Nov 28, 2007 at 01:23:02PM +0100, Kay Sievers wrote:
> On Wed, 2007-11-28 at 12:45 +0100, Cornelia Huck wrote:
> > On Tue, 27 Nov 2007 15:02:52 -0800, Greg KH <greg@...ah.com> wrote:
> 
> > > A kset serves these functions:
> > > 
> > >  - It serves as a bag containing a group of objects. A kset can be used by
> > >    the kernel to track "all block devices" or "all PCI device drivers."
> > > 
> > >  - A kset is also a subdirectory in sysfs, where the associated kobjects
> > >    with the kset can show up.  
> > 
> > Perhaps better wording:
> > 
> > A kset is also represented via a subdirectory in sysfs, under which the
> > kobjects associated with the kset can show up.
> 
> This draws a misleading picture. A member of a kset shows up where the
> "parent" pointer points to. Like /sys/block is a kset, the kset contains
> disks and partitions, but partitions do not live at the kset, and tons
> of other kset directories where this is the case.
> 
> "If the kobject belonging to a kset has no parent kobject set, it will
> be added to the kset's directory. Not all members of a kset do
> necessarily live in the kset directory. If an explicit parent kobject is
> assigned before the kobject is added, the kobject is registered with the
> kset, but added below the parent kobject."

Nice, thanks, I've added this :)

greg k-h
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