Re: [Xen-devel] [PATCH 1/9] drm/xen-front: Introduce Xen para-virtualized frontend driver

[Oleksandr Andrushchenko]

On 02/21/2018 12:19 PM, Roger Pau Monnà wrote:
> On Wed, Feb 21, 2018 at 11:42:23AM +0200, Oleksandr Andrushchenko wrote:
> > On 02/21/2018 11:17 AM, Roger Pau Monnà wrote:
> > > On Wed, Feb 21, 2018 at 10:03:34AM +0200, Oleksandr Andrushchenko wrote:
> > > > --- /dev/null
> > > > +++ b/drivers/gpu/drm/xen/xen_drm_front.c
> > > > @@ -0,0 +1,83 @@
> > > > +/*
> > > > + *  Xen para-virtual DRM device
> > > > + *
> > > > + *   This program is free software; you can redistribute it and/or modify
> > > > + *   it under the terms of the GNU General Public License as published by
> > > > + *   the Free Software Foundation; either version 2 of the License, or
> > > > + *   (at your option) any later version.
> > > > + *
> > > > + *   This program is distributed in the hope that it will be useful,
> > > > + *   but WITHOUT ANY WARRANTY; without even the implied warranty of
> > > > + *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> > > > + *   GNU General Public License for more details.
> > > Most Xen drivers in Linux use a dual GPL/BSD license, so that they can
> > > be imported into other non GPL OSes:
> > >
> > > 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
> > > restriction, including without limitation the rights to use, copy, modify,
> > > merge, publish, distribute, sublicense, and/or sell copies of the Software,
> > > and to permit persons to whom the Software is furnished to do so, subject to
> > > the following conditions:
> > >
> > > The above copyright notice and this permission notice shall be included in
> > > all copies or substantial portions of the Software.
> > >
> > > THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> > > IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> > > FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
> > > AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> > > LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> > > FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> > > IN THE SOFTWARE.
> > >
> > > IMO it would be good to release this driver under the same license, so
> > > it can be incorporated into other OSes.
> > I am in any way expert in licensing, but the above seems to be
> > /* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
> > At least this is what I see at [1] for MIT.
> > Could you please tell which license(s) as listed at [1]
> > would be appropriate for Xen drivers in terms of how it is
> > expected to appear in the kernel code, e.g. expected
> > SPDX-License-Identifier?
> I would be fine with anything MIT/BSD-*/Apache-* like. In the Xen
> community we have generally done dual GPL-2.0 MIT, so your proposed
> tag looks fine IMO (I would also personally be fine with
> MIT/BSD-*/Apache-* only).
Ok, then I am about to use /* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
> The point is that it would be good to have the code under a more
> permissive license so it can be integrated into non GPL OSes in the
> future if needed, and that your code could be used as a reference for
> that.
That is clear, no objections
> Thanks, Roger.
Thank you,
Oleksandr