linux-kernel - Which SPDX Identifier for files without explicit GPL version

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Message-ID: <406c69c1-43fd-f821-b74b-a1399ed636e9@gmail.com>
Date:   Sun, 28 Oct 2018 11:04:06 +0100
From:   Michael Straube <straube.linux@...il.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        devel@...verdev.osuosl.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Which SPDX Identifier for files without explicit GPL version

Hi,

which GPL version should be used in SPDX Identifiers for files that
are GPL licensed but do not mention any version? It is not clear to
me after reading license-rules.rst.

For example:

/******************************************************************************
  * Copyright(c) 2008 - 2010 Realtek Corporation. All rights reserved.
  *
  * 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.
  *
  * The full GNU General Public License is included in this distribution in the
  * file called LICENSE.
  *
  * Contact Information:
  * wlanfae <wlanfae@...ltek.com>
  *****************************************************************************/

or:

/* IEEE 802.11 SoftMAC layer
  * Copyright (c) 2005 Andrea Merello <andrea.merello@...il.com>
  *
  * Mostly extracted from the rtl8180-sa2400 driver for the
  * in-kernel generic ieee802.11 stack.
  *
  * Some pieces of code might be stolen from ipw2100 driver
  * copyright of who own it's copyright ;-)
  *
  * PS wx handler mostly stolen from hostap, copyright who
  * own it's copyright ;-)
  *
  * released under the GPL
  */

Should it be GPL-2.0 ?

Regards,
Michael