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Date:	Thu, 29 Mar 2007 19:31:04 -0700
From:	Greg KH <>
To:	Kay Sievers <>,
Subject: Re: new sysfs layout and ethernet device names

On Wed, Mar 28, 2007 at 08:41:38PM -0400, Bill Nottingham wrote:
> Greg KH ( said: 
> > If you follow the rules in Documentation/ABI/testing/sysfs-class your
> > program will not have any problems.
> Oh, of *course*. We add interfaces and then claim years later,
> after code has been written, "Oh, you shouldn't be using that!" in
> documentation. Meanwhile, such code using the old interface will still
> a) continue to compile b) continue to run without any sort of warnings.
> If interfaces have to change, so be it. But changing the rules for
> using them years after it's implemented and then claiming "you didn't
> read the instructions" is pretty lame.

That documentation has been in the kernel tree for almost a full year:
	commit c18f6365fdbaf30611a8822afcd7097865dcaa32
	Author: Greg Kroah-Hartman <>
	Date:   Thu Apr 27 14:10:12 2006 -0700

	    [PATCH] Add kernel<->userspace ABI stability documentation

And Kay and I have been saying to not to rely on directories for over
two years now...

Anyway, yes, older code should still "just work" if you enable the
CONFIG_SYSFS_DEPRECATED config option in the kernel, that is what it is
there for.

If you have any problems with that option enabled, please let me know
and I will be glad to fix it up.


greg k-h
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