treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 38

Based on 1 normalized pattern(s):

  this file is released under the gplv2 and any later version

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1 file(s).
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Reviewed-by: NAllison Randal <allison@lohutok.net>
Reviewed-by: NKate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190520170857.732920462@linutronix.deSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

kernel/stop_machine.c

+// SPDX-License-Identifier: GPL-2.0-or-later
 /*
  * kernel/stop_machine.c
  *
@@ -5,8 +6,6 @@
  * Copyright (C) 2008, 2005	Rusty Russell rusty@rustcorp.com.au
  * Copyright (C) 2010		SUSE Linux Products GmbH
  * Copyright (C) 2010		Tejun Heo <tj@kernel.org>
- *
- * This file is released under the GPLv2 and any later version.
  */
 #include <linux/completion.h>
 #include <linux/cpu.h>