Re: [PATCH v1 17/22] util/char_dev: Add open_cdev()

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Sep 20, 2023 at 09:53:46AM -0300, Jason Gunthorpe wrote:
> On Wed, Sep 20, 2023 at 01:39:02PM +0100, Daniel P. Berrangé wrote:
> 
> > > diff --git a/util/chardev_open.c b/util/chardev_open.c
> > > new file mode 100644
> > > index 0000000000..d03e415131
> > > --- /dev/null
> > > +++ b/util/chardev_open.c
> > > @@ -0,0 +1,61 @@
> > > +/*
> > > + * Copyright (C) 2023 Intel Corporation.
> > > + * Copyright (c) 2019, Mellanox Technologies. All rights reserved.
> > > + *
> > > + * Authors: Yi Liu <yi.l.liu@intel.com>
> > > + *
> > > + * This work is licensed under the terms of the GNU GPL, version 2.  See
> > > + * the COPYING file in the top-level directory.
> > > + *
> > > + * Copied from
> > > + * https://github.com/linux-rdma/rdma-core/blob/master/util/open_cdev.c
> > > + *
> > > + */
> > 
> > Since this is GPL-2.0-only, IMHO it would be preferrable to keep it
> > out of the util/ directory, as we're aiming to not add further 2.0
> > only code, except for specific subdirs. This only appears to be used
> > by code under hw/vfio/, whcih is one of the dirs still permitting
> > 2.0-only code. So I think better to keep this file where it is used.
> 
> The copyright comment above is not fully accurate.
> 
> The original code is under the "OpenIB" dual license, you can choose
> to take it using the OpenIB BSD license text:
> 
>  *      Redistribution and use in source and binary forms, with or
>  *      without modification, are permitted provided that the following
>  *      conditions are met:
>  *
>  *      - Redistributions of source code must retain the above
>  *        copyright notice, this list of conditions and the following
>  *        disclaimer.
>  *
>  *      - Redistributions in binary form must reproduce the above
>  *        copyright notice, this list of conditions and the following
>  *        disclaimer in the documentation and/or other materials
>  *        provided with the distribution.
>  *
>  * 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.
> 
> And drop reference to GPL if that is what qemu desires.

Simplest is probably just to copy the original license header as-is,
and thus preserve the GPL OR BSD choice.

With regards,
Daniel
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