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:

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On Fri, Jul 27, 2012 at 02:02:18PM +0100, Stefano Stabellini wrote:

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+/******************************************************************************
+ * hypercall.h
+ *
+ * Linux-specific hypervisor handling.
+ *
+ * Stefano Stabellini [off-list ref], 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.)