linux-kernel - Re: [PATCH v3 4/4] Input: add Apple SPI keyboard and trackpad driver.

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Date:   Wed, 27 Mar 2019 15:15:38 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Ronald Tschalär <ronald@...ovation.ch>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Henrik Rydberg <rydberg@...math.org>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Lukas Wunner <lukas@...ner.de>,
        Federico Lorenzi <federico@...velground.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] Input: add Apple SPI keyboard and trackpad
 driver.

On Wed, 27 Mar 2019 19:45:26 +0100
Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:

> > > +// SPDX-License-Identifier: GPL-2.0  
> > 
> > According to last changes this should be GPL-2.0-only  
> 
> What "last changes"?  "GPL-2.0" is a totally valid SPDX identifier for
> the kernel.  Don't buy into the "-only" prefix crud that the newer SPDX
> version adopted for crazy reasons.  The in-kernel documentation lists
> the valid identifiers and the version of SPDX we are currently using.

According to: LICENSES/preferred/GPL-2.0

> SPDX-URL: https://spdx.org/licenses/GPL-2.0.html
> Usage-Guide:
>   To use this license in source code, put one of the following SPDX
>   tag/value pairs into a comment according to the placement
>   guidelines in the licensing rules documentation.
>   For 'GNU General Public License (GPL) version 2 only' use:
>     SPDX-License-Identifier: GPL-2.0
>   or
>     SPDX-License-Identifier: GPL-2.0-only
>   For 'GNU General Public License (GPL) version 2 or any later version' use:
>     SPDX-License-Identifier: GPL-2.0+
>   or
>     SPDX-License-Identifier: GPL-2.0-or-later

So, GPL-2.0 is the same as GPL-2.0-only. Changing it from one to the
other doesn't make any difference.

-- Steve