Re: [PATCH] add feature-removal-schedule.txt documentation

[Paul E. McKenney]

On Sat, Jan 08, 2005 at 09:46:34PM +0000, Alan Cox wrote:
> On Sad, 2005-01-08 at 18:32, Paul E. McKenney wrote:
> > What:	call_rcu(), call_rcu_bh(), and synchronize_kernel() change from
> > 	EXPORT_SYMBOL() to EXPORT_SYMBOL_GPL().
> > When:	January 9, 2006
> > Files:  kernel/rcupdate.c
> > Why:	There are no known environments supporting RCU from which
> > 	one could reasonably expect to port a non-GPL kernel module
> > 	or driver to Linux.
> 
> IBM might want to also note that anyone wanting to do so needs an IBM
> patent license for non GPL use ..

Last time I checked with IBM's lawyers, they were not interested in doing
so.  Nonetheless, you are correct, non-GPL use of RCU would require a
conversation with IBM.  And in fact the five relevant patents (one lapsed)
are called out in Documentation/RCU/RTFP.txt.  The four non-lapsed patents
are called out as "contributed under GPL", so I think that we are covered.

							Thanx, Paul
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