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>

15 files changed, 15 insertions, 0 deletions

diff --git a/arch/h8300/lib/abs.S b/arch/h8300/lib/abs.S
index efda749db03e..6e1a4ed3af53 100644
--- a/arch/h8300/lib/abs.S
+++ b/arch/h8300/lib/abs.S
@@ -1,3 +1,4 @@
+;;; SPDX-License-Identifier: GPL-2.0
 ;;; abs.S
 
 #include <asm/linkage.h>
diff --git a/arch/h8300/lib/ashldi3.c b/arch/h8300/lib/ashldi3.c
index c6aa8ea5f4be..430720c0c5d8 100644
--- a/arch/h8300/lib/ashldi3.c
+++ b/arch/h8300/lib/ashldi3.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include "libgcc.h"
 
 DWtype
diff --git a/arch/h8300/lib/ashrdi3.c b/arch/h8300/lib/ashrdi3.c
index 070adf96d3b6..2c6cd424eb3e 100644
--- a/arch/h8300/lib/ashrdi3.c
+++ b/arch/h8300/lib/ashrdi3.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include "libgcc.h"
 
 DWtype __ashrdi3(DWtype u, word_type b)
diff --git a/arch/h8300/lib/delay.c b/arch/h8300/lib/delay.c
index 463f6b3afb52..f4277529a9b9 100644
--- a/arch/h8300/lib/delay.c
+++ b/arch/h8300/lib/delay.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * delay loops
  *
diff --git a/arch/h8300/lib/libgcc.h b/arch/h8300/lib/libgcc.h
index 468a8f78197a..b8bcf7035ff5 100644
--- a/arch/h8300/lib/libgcc.h
+++ b/arch/h8300/lib/libgcc.h
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #ifndef __H8300_LIBGCC_H__
 #define __H8300_LIBGCC_H__
 
diff --git a/arch/h8300/lib/lshrdi3.c b/arch/h8300/lib/lshrdi3.c
index a86bbe395f17..8dbc861ca589 100644
--- a/arch/h8300/lib/lshrdi3.c
+++ b/arch/h8300/lib/lshrdi3.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include "libgcc.h"
 
 DWtype __lshrdi3(DWtype u, word_type b)
diff --git a/arch/h8300/lib/memcpy.S b/arch/h8300/lib/memcpy.S
index 0c9a51fcdea1..f1cd67d5e3ea 100644
--- a/arch/h8300/lib/memcpy.S
+++ b/arch/h8300/lib/memcpy.S
@@ -1,3 +1,4 @@
+;;; SPDX-License-Identifier: GPL-2.0
 ;;; memcpy.S
 
 #include <asm/linkage.h>
diff --git a/arch/h8300/lib/memset.S b/arch/h8300/lib/memset.S
index 18d4e709b5f4..2d1abc37fd08 100644
--- a/arch/h8300/lib/memset.S
+++ b/arch/h8300/lib/memset.S
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 /* memset.S */
 
 #include <asm/linkage.h>
diff --git a/arch/h8300/lib/moddivsi3.S b/arch/h8300/lib/moddivsi3.S
index c803129e877f..9e33ab0456c7 100644
--- a/arch/h8300/lib/moddivsi3.S
+++ b/arch/h8300/lib/moddivsi3.S
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #include "libgcc.h"
 
 ; numerator in A0/A1
diff --git a/arch/h8300/lib/modsi3.S b/arch/h8300/lib/modsi3.S
index 68b1dfc32824..bdc8a002921d 100644
--- a/arch/h8300/lib/modsi3.S
+++ b/arch/h8300/lib/modsi3.S
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #include "libgcc.h"
 
 ; numerator in A0/A1
diff --git a/arch/h8300/lib/muldi3.c b/arch/h8300/lib/muldi3.c
index 790512243531..9cb11b134e54 100644
--- a/arch/h8300/lib/muldi3.c
+++ b/arch/h8300/lib/muldi3.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include "libgcc.h"
 
 #define __ll_B ((UWtype) 1 << (W_TYPE_SIZE / 2))
diff --git a/arch/h8300/lib/mulsi3.S b/arch/h8300/lib/mulsi3.S
index 451f0e0538ee..5a062fd298d1 100644
--- a/arch/h8300/lib/mulsi3.S
+++ b/arch/h8300/lib/mulsi3.S
@@ -1,3 +1,4 @@
+; SPDX-License-Identifier: GPL-2.0
 ;
 ; mulsi3 for H8/300H - based on Renesas SH implementation
 ;
diff --git a/arch/h8300/lib/strncpy.S b/arch/h8300/lib/strncpy.S
index d00396a378f4..8b65d7c4727b 100644
--- a/arch/h8300/lib/strncpy.S
+++ b/arch/h8300/lib/strncpy.S
@@ -1,3 +1,4 @@
+;;; SPDX-License-Identifier: GPL-2.0
 ;;; strncpy.S
 
 #include <asm/linkage.h>
diff --git a/arch/h8300/lib/ucmpdi2.c b/arch/h8300/lib/ucmpdi2.c
index 772399d705cb..9f646885f3d7 100644
--- a/arch/h8300/lib/ucmpdi2.c
+++ b/arch/h8300/lib/ucmpdi2.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 #include "libgcc.h"
 
 word_type __ucmpdi2(DWtype a, DWtype b)
diff --git a/arch/h8300/lib/udivsi3.S b/arch/h8300/lib/udivsi3.S
index bbe65610f316..b810aba8e100 100644
--- a/arch/h8300/lib/udivsi3.S
+++ b/arch/h8300/lib/udivsi3.S
@@ -1,3 +1,4 @@
+/* SPDX-License-Identifier: GPL-2.0 */
 #include "libgcc.h"
 
 	;; This function also computes the remainder and stores it in er3.