linux-kernel - Re: [Xen-devel] [PATCH 02/24] xen/arm: hypercalls

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Date:	Fri, 27 Jul 2012 15:59:00 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"linaro-dev@...ts.linaro.org" <linaro-dev@...ts.linaro.org>,
	"arnd@...db.de" <arnd@...db.de>,
	"catalin.marinas@....com" <catalin.marinas@....com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"Tim (Xen.org)" <tim@....org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH 02/24] xen/arm: hypercalls

On Fri, Jul 27, 2012 at 03:39:31PM +0100, Ian Campbell wrote:
> On Fri, 2012-07-27 at 15:21 +0100, Russell King - ARM Linux wrote:
> > On Fri, Jul 27, 2012 at 02:02:18PM +0100, Stefano Stabellini wrote:
> > > > > > +/******************************************************************************
> > > > > > + * hypercall.h
> > > > > > + *
> > > > > > + * Linux-specific hypervisor handling.
> > > > > > + *
> > > > > > + * Stefano Stabellini <stefano.stabellini@...citrix.com>, Citrix, 2012
> > > > > > + *
> > > > > > + * This program is free software; you can redistribute it and/or
> > > > > > + * modify it under the terms of the GNU General Public License version 2
> > > > > > + * as published by the Free Software Foundation; or, when distributed
> > > > > > + * separately from the Linux kernel or incorporated into other
> > > > > > + * software packages, subject to the following license:
> > > > > > + *
> > > > > > + * Permission is hereby granted, free of charge, to any person obtaining a copy
> > > > > > + * of this source file (the "Software"), to deal in the Software without
> > 
> > Erm, is that an additional restriction on the GPL which prevents me from
> > shipping this code on a CD and charging for the act of creating the CD
> > and shipping it?  That would technically make the above statement
> > incompatible with the GPL.
> 
> There's an "or" in there.
> 
> The non-GPL alternative license is the standard one applied by upstream
> Xen to the interface headers:
>         http://xenbits.xen.org/hg/xen-unstable.hg/file/tip/xen/include/public/COPYING
> 
> It's the X11/MIT license IIRC, which the FSF say is GPL compatible.
> http://www.gnu.org/licenses/license-list.html#X11License
> 
> The same license is used a few other places in the kernel, e.g. the DRM
> code.

Ok, but be aware that you won't be able to take code from the Linux
kernel and place it in a file marked with that license header (because
the code authors haven't given permission for it to be placed under any
other license other than GPLv2.)
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