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>
2017-11-01 08:07:57 -06:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2015-11-30 20:36:38 -07:00
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#ifndef _ASM_POWERPC_NOHASH_PTE_BOOK3E_H
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#define _ASM_POWERPC_NOHASH_PTE_BOOK3E_H
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#ifdef __KERNEL__
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/* PTE bit definitions for processors compliant to the Book3E
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* architecture 2.06 or later. The position of the PTE bits
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* matches the HW definition of the optional Embedded Page Table
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* category.
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*/
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/* Architected bits */
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#define _PAGE_PRESENT 0x000001 /* software: pte contains a translation */
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#define _PAGE_SW1 0x000002
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#define _PAGE_BIT_SWAP_TYPE 2
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#define _PAGE_BAP_SR 0x000004
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#define _PAGE_BAP_UR 0x000008
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#define _PAGE_BAP_SW 0x000010
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#define _PAGE_BAP_UW 0x000020
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#define _PAGE_BAP_SX 0x000040
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#define _PAGE_BAP_UX 0x000080
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#define _PAGE_PSIZE_MSK 0x000f00
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#define _PAGE_PSIZE_4K 0x000200
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#define _PAGE_PSIZE_8K 0x000300
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#define _PAGE_PSIZE_16K 0x000400
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#define _PAGE_PSIZE_32K 0x000500
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#define _PAGE_PSIZE_64K 0x000600
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#define _PAGE_PSIZE_128K 0x000700
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#define _PAGE_PSIZE_256K 0x000800
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#define _PAGE_PSIZE_512K 0x000900
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#define _PAGE_PSIZE_1M 0x000a00
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#define _PAGE_PSIZE_2M 0x000b00
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#define _PAGE_PSIZE_4M 0x000c00
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#define _PAGE_PSIZE_8M 0x000d00
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#define _PAGE_PSIZE_16M 0x000e00
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#define _PAGE_PSIZE_32M 0x000f00
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#define _PAGE_DIRTY 0x001000 /* C: page changed */
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#define _PAGE_SW0 0x002000
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#define _PAGE_U3 0x004000
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#define _PAGE_U2 0x008000
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#define _PAGE_U1 0x010000
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#define _PAGE_U0 0x020000
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#define _PAGE_ACCESSED 0x040000
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#define _PAGE_ENDIAN 0x080000
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#define _PAGE_GUARDED 0x100000
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#define _PAGE_COHERENT 0x200000 /* M: enforce memory coherence */
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#define _PAGE_NO_CACHE 0x400000 /* I: cache inhibit */
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#define _PAGE_WRITETHRU 0x800000 /* W: cache write-through */
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/* "Higher level" linux bit combinations */
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#define _PAGE_EXEC _PAGE_BAP_UX /* .. and was cache cleaned */
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#define _PAGE_RW (_PAGE_BAP_SW | _PAGE_BAP_UW) /* User write permission */
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#define _PAGE_KERNEL_RW (_PAGE_BAP_SW | _PAGE_BAP_SR | _PAGE_DIRTY)
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#define _PAGE_KERNEL_RO (_PAGE_BAP_SR)
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#define _PAGE_KERNEL_RWX (_PAGE_BAP_SW | _PAGE_BAP_SR | _PAGE_DIRTY | _PAGE_BAP_SX)
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#define _PAGE_KERNEL_ROX (_PAGE_BAP_SR | _PAGE_BAP_SX)
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#define _PAGE_USER (_PAGE_BAP_UR | _PAGE_BAP_SR) /* Can be read */
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#define _PAGE_PRIVILEGED (_PAGE_BAP_SR)
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#define _PAGE_HASHPTE 0
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#define _PAGE_BUSY 0
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#define _PAGE_SPECIAL _PAGE_SW0
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/* Flags to be preserved on PTE modifications */
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#define _PAGE_HPTEFLAGS _PAGE_BUSY
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/* Base page size */
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#ifdef CONFIG_PPC_64K_PAGES
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#define _PAGE_PSIZE _PAGE_PSIZE_64K
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#define PTE_RPN_SHIFT (28)
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#else
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#define _PAGE_PSIZE _PAGE_PSIZE_4K
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#define PTE_RPN_SHIFT (24)
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#endif
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2011-06-28 03:54:48 -06:00
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#define PTE_WIMGE_SHIFT (19)
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#define PTE_BAP_SHIFT (2)
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2009-07-27 19:59:34 -06:00
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/* On 32-bit, we never clear the top part of the PTE */
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#ifdef CONFIG_PPC32
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#define _PTE_NONE_MASK 0xffffffff00000000ULL
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#define _PMD_PRESENT 0
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#define _PMD_PRESENT_MASK (PAGE_MASK)
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#define _PMD_BAD (~PAGE_MASK)
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#endif
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#endif /* __KERNEL__ */
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2015-11-30 20:36:38 -07:00
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#endif /* _ASM_POWERPC_NOHASH_PTE_BOOK3E_H */
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