Re: some simple questions about sysfs

["Robert P. J. Day" <rpjday@xxxxxxxxxxxxxx>]

On Thu, 1 Mar 2007, Greg KH wrote:

> Simple?  Are you crazy?

my emotional stability has nothing to do with this.  try to focus,
greg. :-P

> >   i'm trying to clarify the interconnection between all of the sysfs
> > structures, so a few questions:
> >
> > 1) is it true that an entry exists at the top of the sysfs if and only
> > if it is a subsystem?  there's no notion of a lower-level subsystem,
> > is there?  that is, subsystems aren't defined recursively.
>
> No, you can create an entry at the top if you use a kobject with no
> parent.

ah, now that wasn't obvious from any explanation i've read.  so if you
look at a subsystem structure, it has a "kset" member, whose internal
"kobject" represents its position in the sysfs hierarchy.  and it's
that internal kobject that represents a subsystem's position in the
hierarchy, is that it?

in short, ksets and subsystems themselves are examples of "kobjects"
which define their position in the tree.  ok, that definitely clears
things up a bit, and explains how subsystems can exist further down
the tree.

more later after i do more reading.

rday

-- 
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Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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