Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262262AbVAIG1s (ORCPT ); Sun, 9 Jan 2005 01:27:48 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262263AbVAIG1s (ORCPT ); Sun, 9 Jan 2005 01:27:48 -0500 Received: from e31.co.us.ibm.com ([32.97.110.129]:25485 "EHLO e31.co.us.ibm.com") by vger.kernel.org with ESMTP id S262262AbVAIG1r (ORCPT ); Sun, 9 Jan 2005 01:27:47 -0500 Date: Sat, 8 Jan 2005 22:27:31 -0800 From: "Paul E. McKenney" To: Alan Cox Cc: Greg KH , Andrew Morton , Al Viro , arjan@infradead.org, Linux Kernel Mailing List , jtk@us.ibm.com, wtaber@us.ibm.com, pbadari@us.ibm.com, markv@us.ibm.com, greghk@us.ibm.com, Linus Torvalds , dipankar@in.ibm.com Subject: Re: [PATCH] add feature-removal-schedule.txt documentation Message-ID: <20050109062731.GD1265@us.ibm.com> Reply-To: paulmck@us.ibm.com References: <20050106190538.GB1618@us.ibm.com> <1105039259.4468.9.camel@laptopd505.fenrus.org> <20050106201531.GJ1292@us.ibm.com> <20050106203258.GN26051@parcelfarce.linux.theplanet.co.uk> <20050106210408.GM1292@us.ibm.com> <20050106212417.GQ26051@parcelfarce.linux.theplanet.co.uk> <20050106152621.395f935e.akpm@osdl.org> <20050106235633.GA10110@kroah.com> <20050108183220.GA2033@us.ibm.com> <1105215021.10519.50.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1105215021.10519.50.camel@localhost.localdomain> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1190 Lines: 25 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/