Subject: Re: Device Properties: The Next Generation
To: None <>
From: Chris G. Demetriou <>
List: tech-kern
Date: 02/16/2001 15:11:25 writes:
> 	I think doing inheritance based on the property, rather than the type
> 	of call to lookup, would probably address most of my concerns that
> 	would require "white-outs".
> Limiting inheritance to `x' number of levels does not work.  A bus
> driver cannot know how many levels of bridges are between it and the
> end device.  You would need a way to `extend' properties down another
> level, which is the equivalent of just duplicating them on each level.

Ahh, but, in that case, the thing doing the extending _is_ effectively
another bus bridge.  It may not act like that in hardware really, but
in terms of the configuration code, it's parent.

It's duplicating them at very bus bridge (once per 'level' if that's
the way you want to think about it), which should be significantly
less duplication than if done at every device.  (log N vs N.)

I'm still thinking that limiting inheritance to 'x' number of levels
is the best thought so far for doing inheritance sanely...