License cleanup: add SPDX GPL-2.0 license identifier to files with no license

Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.

By default all files without license information are under the default
license of the kernel, which is GPL version 2.

Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier.  The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.

This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.

How this work was done:

Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
 - file had no licensing information it it.
 - file was a */uapi/* one with no licensing information in it,
 - file was a */uapi/* one with existing licensing information,

Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.

The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne.  Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.

The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed.  Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.

Criteria used to select files for SPDX license identifier tagging was:
 - Files considered eligible had to be source code files.
 - Make and config files were included as candidates if they contained >5
   lines of source
 - File already had some variant of a license header in it (even if <5
   lines).

All documentation files were explicitly excluded.

The following heuristics were used to determine which SPDX license
identifiers to apply.

 - when both scanners couldn't find any license traces, file was
   considered to have no license information in it, and the top level
   COPYING file license applied.

   For non */uapi/* files that summary was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0                                              11139

   and resulted in the first patch in this series.

   If that file was a */uapi/* path one, it was "GPL-2.0 WITH
   Linux-syscall-note" otherwise it was "GPL-2.0".  Results of that was:

   SPDX license identifier                            # files
   ---------------------------------------------------|-------
   GPL-2.0 WITH Linux-syscall-note                        930

   and resulted in the second patch in this series.

 - if a file had some form of licensing information in it, and was one
   of the */uapi/* ones, it was denoted with the Linux-syscall-note if
   any GPL family license was found in the file or had no licensing in
   it (per prior point).  Results summary:

   SPDX license identifier                            # files
   ---------------------------------------------------|------
   GPL-2.0 WITH Linux-syscall-note                       270
   GPL-2.0+ WITH Linux-syscall-note                      169
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause)    21
   ((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause)    17
   LGPL-2.1+ WITH Linux-syscall-note                      15
   GPL-1.0+ WITH Linux-syscall-note                       14
   ((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause)    5
   LGPL-2.0+ WITH Linux-syscall-note                       4
   LGPL-2.1 WITH Linux-syscall-note                        3
   ((GPL-2.0 WITH Linux-syscall-note) OR MIT)              3
   ((GPL-2.0 WITH Linux-syscall-note) AND MIT)             1

   and that resulted in the third patch in this series.

 - when the two scanners agreed on the detected license(s), that became
   the concluded license(s).

 - when there was disagreement between the two scanners (one detected a
   license but the other didn't, or they both detected different
   licenses) a manual inspection of the file occurred.

 - In most cases a manual inspection of the information in the file
   resulted in a clear resolution of the license that should apply (and
   which scanner probably needed to revisit its heuristics).

 - When it was not immediately clear, the license identifier was
   confirmed with lawyers working with the Linux Foundation.

 - If there was any question as to the appropriate license identifier,
   the file was flagged for further research and to be revisited later
   in time.

In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.

Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights.  The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.

Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.

In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.

Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
 - a full scancode scan run, collecting the matched texts, detected
   license ids and scores
 - reviewing anything where there was a license detected (about 500+
   files) to ensure that the applied SPDX license was correct
 - reviewing anything where there was no detection but the patch license
   was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
   SPDX license was correct

This produced a worksheet with 20 files needing minor correction.  This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.

These .csv files were then reviewed by Greg.  Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected.  This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.)  Finally Greg ran the script using the .csv files to
generate the patches.

Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

42 files changed, 42 insertions, 0 deletions

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index 89bdb8264305..af5369422032 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 config MMU
 	def_bool n
 
diff --git a/arch/blackfin/Kconfig.debug b/arch/blackfin/Kconfig.debug
index f3337ee03621..4ddd1b73ee3e 100644
--- a/arch/blackfin/Kconfig.debug
+++ b/arch/blackfin/Kconfig.debug
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 menu "Kernel hacking"
 
 source "lib/Kconfig.debug"
diff --git a/arch/blackfin/include/asm/clkdev.h b/arch/blackfin/include/asm/clkdev.h
index 7ac2436856a5..ded0209348c7 100644
--- a/arch/blackfin/include/asm/clkdev.h
+++ b/arch/blackfin/include/asm/clkdev.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __ASM_CLKDEV__H_
 #define __ASM_CLKDEV__H_
 
diff --git a/arch/blackfin/include/asm/pci.h b/arch/blackfin/include/asm/pci.h
index 11ea1cb35036..e6458ddbaf7e 100644
--- a/arch/blackfin/include/asm/pci.h
+++ b/arch/blackfin/include/asm/pci.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /* Changed from asm-m68k version, Lineo Inc. 	May 2001	*/
 
 #ifndef _ASM_BFIN_PCI_H
diff --git a/arch/blackfin/include/asm/rwlock.h b/arch/blackfin/include/asm/rwlock.h
index 4a724b378971..98ebc07cb283 100644
--- a/arch/blackfin/include/asm/rwlock.h
+++ b/arch/blackfin/include/asm/rwlock.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef _ASM_BLACKFIN_RWLOCK_H
 #define _ASM_BLACKFIN_RWLOCK_H
 
diff --git a/arch/blackfin/include/mach-common/ports-a.h b/arch/blackfin/include/mach-common/ports-a.h
index 9f78a761c40a..71bcd74f83fd 100644
--- a/arch/blackfin/include/mach-common/ports-a.h
+++ b/arch/blackfin/include/mach-common/ports-a.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Port A Masks
  */
diff --git a/arch/blackfin/include/mach-common/ports-b.h b/arch/blackfin/include/mach-common/ports-b.h
index b81702f09ec6..8013cc8e839b 100644
--- a/arch/blackfin/include/mach-common/ports-b.h
+++ b/arch/blackfin/include/mach-common/ports-b.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Port B Masks
  */
diff --git a/arch/blackfin/include/mach-common/ports-c.h b/arch/blackfin/include/mach-common/ports-c.h
index 3cc665e0ba08..94e71010ffe9 100644
--- a/arch/blackfin/include/mach-common/ports-c.h
+++ b/arch/blackfin/include/mach-common/ports-c.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Port C Masks
  */
diff --git a/arch/blackfin/include/mach-common/ports-d.h b/arch/blackfin/include/mach-common/ports-d.h
index 868c6a01f1b2..ba84a9fb3450 100644
--- a/arch/blackfin/include/mach-common/ports-d.h
+++ b/arch/blackfin/include/mach-common/ports-d.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Port D Masks
  */
diff --git a/arch/blackfin/include/mach-common/ports-e.h b/arch/blackfin/include/mach-common/ports-e.h
index c88b0d0dd443..2264fb58bc2b 100644
--- a/arch/blackfin/include/mach-common/ports-e.h
+++ b/arch/blackfin/include/mach-common/ports-e.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Port E Masks
  */
diff --git a/arch/blackfin/include/mach-common/ports-f.h b/arch/blackfin/include/mach-common/ports-f.h
index d6af20633278..2b8ca3ae2a8e 100644
--- a/arch/blackfin/include/mach-common/ports-f.h
+++ b/arch/blackfin/include/mach-common/ports-f.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Port F Masks
  */
diff --git a/arch/blackfin/include/mach-common/ports-g.h b/arch/blackfin/include/mach-common/ports-g.h
index 09355d333c0e..11ad917fcf91 100644
--- a/arch/blackfin/include/mach-common/ports-g.h
+++ b/arch/blackfin/include/mach-common/ports-g.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Port G Masks
  */
diff --git a/arch/blackfin/include/mach-common/ports-h.h b/arch/blackfin/include/mach-common/ports-h.h
index fa3910c6fbd4..511d088b8094 100644
--- a/arch/blackfin/include/mach-common/ports-h.h
+++ b/arch/blackfin/include/mach-common/ports-h.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Port H Masks
  */
diff --git a/arch/blackfin/include/mach-common/ports-i.h b/arch/blackfin/include/mach-common/ports-i.h
index f176f08af624..21bbab166ae8 100644
--- a/arch/blackfin/include/mach-common/ports-i.h
+++ b/arch/blackfin/include/mach-common/ports-i.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Port I Masks
  */
diff --git a/arch/blackfin/include/mach-common/ports-j.h b/arch/blackfin/include/mach-common/ports-j.h
index 924123ecec5a..96a252b0b0bd 100644
--- a/arch/blackfin/include/mach-common/ports-j.h
+++ b/arch/blackfin/include/mach-common/ports-j.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /*
  * Port J Masks
  */
diff --git a/arch/blackfin/kernel/Makefile b/arch/blackfin/kernel/Makefile
index 703dc7cf2ecc..1580791f0e3a 100644
--- a/arch/blackfin/kernel/Makefile
+++ b/arch/blackfin/kernel/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # arch/blackfin/kernel/Makefile
 #
diff --git a/arch/blackfin/kernel/cplb-nompu/Makefile b/arch/blackfin/kernel/cplb-nompu/Makefile
index 394d0b1b28fe..81baa27bc389 100644
--- a/arch/blackfin/kernel/cplb-nompu/Makefile
+++ b/arch/blackfin/kernel/cplb-nompu/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # arch/blackfin/kernel/cplb-nompu/Makefile
 #
diff --git a/arch/blackfin/lib/Makefile b/arch/blackfin/lib/Makefile
index 42c47dc9e12f..74ddde0eb2e7 100644
--- a/arch/blackfin/lib/Makefile
+++ b/arch/blackfin/lib/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # arch/blackfin/lib/Makefile
 #
diff --git a/arch/blackfin/mach-bf518/Kconfig b/arch/blackfin/mach-bf518/Kconfig
index bde92a19970e..4731f6b27e47 100644
--- a/arch/blackfin/mach-bf518/Kconfig
+++ b/arch/blackfin/mach-bf518/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 config BF51x
 	def_bool y
 	depends on (BF512 || BF514 || BF516 || BF518)
diff --git a/arch/blackfin/mach-bf518/boards/Kconfig b/arch/blackfin/mach-bf518/boards/Kconfig
index 252261ec04c4..f7b93b950ef4 100644
--- a/arch/blackfin/mach-bf518/boards/Kconfig
+++ b/arch/blackfin/mach-bf518/boards/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 choice
 	prompt "System type"
 	default BFIN518F_EZBRD
diff --git a/arch/blackfin/mach-bf527/Kconfig b/arch/blackfin/mach-bf527/Kconfig
index 0ba54701af0b..6df20f9c7bd4 100644
--- a/arch/blackfin/mach-bf527/Kconfig
+++ b/arch/blackfin/mach-bf527/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 config BF52x
 	def_bool y
 	depends on (BF522 || BF523 || BF524 || BF525 || BF526 || BF527)
diff --git a/arch/blackfin/mach-bf527/boards/Kconfig b/arch/blackfin/mach-bf527/boards/Kconfig
index 1cc2667c10f1..a76f02fae11c 100644
--- a/arch/blackfin/mach-bf527/boards/Kconfig
+++ b/arch/blackfin/mach-bf527/boards/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 choice
 	prompt "System type"
 	default BFIN527_EZKIT
diff --git a/arch/blackfin/mach-bf527/boards/Makefile b/arch/blackfin/mach-bf527/boards/Makefile
index 1d67da9f05ac..6ada1537e20a 100644
--- a/arch/blackfin/mach-bf527/boards/Makefile
+++ b/arch/blackfin/mach-bf527/boards/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # arch/blackfin/mach-bf527/boards/Makefile
 #
diff --git a/arch/blackfin/mach-bf533/Kconfig b/arch/blackfin/mach-bf533/Kconfig
index 4c572443147e..4e1a05be7137 100644
--- a/arch/blackfin/mach-bf533/Kconfig
+++ b/arch/blackfin/mach-bf533/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 if (BF533 || BF532 || BF531)
 
 source "arch/blackfin/mach-bf533/boards/Kconfig"
diff --git a/arch/blackfin/mach-bf533/boards/Kconfig b/arch/blackfin/mach-bf533/boards/Kconfig
index 8d8b3e7321e6..3fde0df1b5f2 100644
--- a/arch/blackfin/mach-bf533/boards/Kconfig
+++ b/arch/blackfin/mach-bf533/boards/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 choice
 	prompt "System type"
 	default BFIN533_STAMP
diff --git a/arch/blackfin/mach-bf533/boards/Makefile b/arch/blackfin/mach-bf533/boards/Makefile
index ff1e832f80d2..35256d2fc040 100644
--- a/arch/blackfin/mach-bf533/boards/Makefile
+++ b/arch/blackfin/mach-bf533/boards/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # arch/blackfin/mach-bf533/boards/Makefile
 #
diff --git a/arch/blackfin/mach-bf537/Kconfig b/arch/blackfin/mach-bf537/Kconfig
index 08b2b343ccec..1d69b043afd4 100644
--- a/arch/blackfin/mach-bf537/Kconfig
+++ b/arch/blackfin/mach-bf537/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 if (BF537 || BF534 || BF536)
 
 source "arch/blackfin/mach-bf537/boards/Kconfig"
diff --git a/arch/blackfin/mach-bf537/boards/Kconfig b/arch/blackfin/mach-bf537/boards/Kconfig
index a44bf3a1816e..60b7b29e512e 100644
--- a/arch/blackfin/mach-bf537/boards/Kconfig
+++ b/arch/blackfin/mach-bf537/boards/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 choice
 	prompt "System type"
 	default BFIN537_STAMP
diff --git a/arch/blackfin/mach-bf537/boards/Makefile b/arch/blackfin/mach-bf537/boards/Makefile
index fe42258fe1f4..47a1acc5f389 100644
--- a/arch/blackfin/mach-bf537/boards/Makefile
+++ b/arch/blackfin/mach-bf537/boards/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # arch/blackfin/mach-bf537/boards/Makefile
 #
diff --git a/arch/blackfin/mach-bf538/Kconfig b/arch/blackfin/mach-bf538/Kconfig
index 2d280f504ab0..4aea85e4e5cf 100644
--- a/arch/blackfin/mach-bf538/Kconfig
+++ b/arch/blackfin/mach-bf538/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 if (BF538 || BF539)
 
 source "arch/blackfin/mach-bf538/boards/Kconfig"
diff --git a/arch/blackfin/mach-bf538/boards/Kconfig b/arch/blackfin/mach-bf538/boards/Kconfig
index 215249ba58bb..114cff440d43 100644
--- a/arch/blackfin/mach-bf538/boards/Kconfig
+++ b/arch/blackfin/mach-bf538/boards/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 choice
 	prompt "System type"
 	default BFIN538_EZKIT
diff --git a/arch/blackfin/mach-bf548/Kconfig b/arch/blackfin/mach-bf548/Kconfig
index 334ec7b12188..71c2a765af1d 100644
--- a/arch/blackfin/mach-bf548/Kconfig
+++ b/arch/blackfin/mach-bf548/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 config BF542
 	def_bool y
 	depends on BF542_std || BF542M
diff --git a/arch/blackfin/mach-bf548/boards/Kconfig b/arch/blackfin/mach-bf548/boards/Kconfig
index d38e52671853..e8ce579ae8f0 100644
--- a/arch/blackfin/mach-bf548/boards/Kconfig
+++ b/arch/blackfin/mach-bf548/boards/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 choice
 	prompt "System type"
 	default BFIN548_EZKIT
diff --git a/arch/blackfin/mach-bf561/Kconfig b/arch/blackfin/mach-bf561/Kconfig
index cb9743641511..059c3cbdb5ec 100644
--- a/arch/blackfin/mach-bf561/Kconfig
+++ b/arch/blackfin/mach-bf561/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 if (BF561)
 
 source "arch/blackfin/mach-bf561/boards/Kconfig"
diff --git a/arch/blackfin/mach-bf561/boards/Kconfig b/arch/blackfin/mach-bf561/boards/Kconfig
index 1aa529b9f8bb..10e977b56710 100644
--- a/arch/blackfin/mach-bf561/boards/Kconfig
+++ b/arch/blackfin/mach-bf561/boards/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 choice
 	prompt "System type"
 	default BFIN561_EZKIT
diff --git a/arch/blackfin/mach-bf609/Kconfig b/arch/blackfin/mach-bf609/Kconfig
index 6584190faeb8..7d6a8b8926ba 100644
--- a/arch/blackfin/mach-bf609/Kconfig
+++ b/arch/blackfin/mach-bf609/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 config BF60x
 	def_bool y
 	depends on (BF609)
diff --git a/arch/blackfin/mach-bf609/boards/Kconfig b/arch/blackfin/mach-bf609/boards/Kconfig
index 30e8b6b0d2ed..350154b2a3ee 100644
--- a/arch/blackfin/mach-bf609/boards/Kconfig
+++ b/arch/blackfin/mach-bf609/boards/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 choice
 	prompt "System type"
 	default BFIN609_EZKIT
diff --git a/arch/blackfin/mach-bf609/clock.c b/arch/blackfin/mach-bf609/clock.c
index 392a59b9a504..16e0b09e2197 100644
--- a/arch/blackfin/mach-bf609/clock.c
+++ b/arch/blackfin/mach-bf609/clock.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/list.h>
diff --git a/arch/blackfin/mach-bf609/dpm.S b/arch/blackfin/mach-bf609/dpm.S
index 54d50c689db1..fcb8f688a8b2 100644
--- a/arch/blackfin/mach-bf609/dpm.S
+++ b/arch/blackfin/mach-bf609/dpm.S
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #include <linux/linkage.h>
 #include <asm/blackfin.h>
 #include <asm/dpmc.h>
diff --git a/arch/blackfin/mach-common/Makefile b/arch/blackfin/mach-common/Makefile
index f09979204040..fcef1c8e117f 100644
--- a/arch/blackfin/mach-common/Makefile
+++ b/arch/blackfin/mach-common/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # arch/blackfin/mach-common/Makefile
 #
diff --git a/arch/blackfin/mach-common/clock.h b/arch/blackfin/mach-common/clock.h
index 645ff460a1f2..fed851a51aaf 100644
--- a/arch/blackfin/mach-common/clock.h
+++ b/arch/blackfin/mach-common/clock.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __MACH_COMMON_CLKDEV_H
 #define __MACH_COMMON_CLKDEV_H
 
diff --git a/arch/blackfin/oprofile/Makefile b/arch/blackfin/oprofile/Makefile
index c70af3a01297..e89e1c9f3496 100644
--- a/arch/blackfin/oprofile/Makefile
+++ b/arch/blackfin/oprofile/Makefile
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
 #
 # arch/blackfin/oprofile/Makefile
 #