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 21:07:57 +07:00
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// SPDX-License-Identifier: GPL-2.0
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2005-04-17 05:20:36 +07:00
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/*
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* P5 specific Machine Check Exception Reporting
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2009-01-05 21:08:04 +07:00
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* (C) Copyright 2002 Alan Cox <alan@lxorguk.ukuu.org.uk>
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2005-04-17 05:20:36 +07:00
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*/
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#include <linux/interrupt.h>
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2009-04-08 17:31:21 +07:00
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#include <linux/kernel.h>
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#include <linux/types.h>
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2005-04-17 05:20:36 +07:00
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#include <linux/smp.h>
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2008-02-20 05:20:45 +07:00
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#include <asm/processor.h>
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2014-11-20 08:41:09 +07:00
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#include <asm/traps.h>
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2014-10-25 05:58:07 +07:00
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#include <asm/tlbflush.h>
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2009-06-15 15:22:15 +07:00
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#include <asm/mce.h>
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2005-04-17 05:20:36 +07:00
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#include <asm/msr.h>
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x86, mce: use 64bit machine check code on 32bit
The 64bit machine check code is in many ways much better than
the 32bit machine check code: it is more specification compliant,
is cleaner, only has a single code base versus one per CPU,
has better infrastructure for recovery, has a cleaner way to communicate
with user space etc. etc.
Use the 64bit code for 32bit too.
This is the second attempt to do this. There was one a couple of years
ago to unify this code for 32bit and 64bit. Back then this ran into some
trouble with K7s and was reverted.
I believe this time the K7 problems (and some others) are addressed.
I went over the old handlers and was very careful to retain
all quirks.
But of course this needs a lot of testing on old systems. On newer
64bit capable systems I don't expect much problems because they have been
already tested with the 64bit kernel.
I made this a CONFIG for now that still allows to select the old
machine check code. This is mostly to make testing easier,
if someone runs into a problem we can ask them to try
with the CONFIG switched.
The new code is default y for more coverage.
Once there is confidence the 64bit code works well on older hardware
too the CONFIG_X86_OLD_MCE and the associated code can be easily
removed.
This causes a behaviour change for 32bit installations. They now
have to install the mcelog package to be able to log
corrected machine checks.
The 64bit machine check code only handles CPUs which support the
standard Intel machine check architecture described in the IA32 SDM.
The 32bit code has special support for some older CPUs which
have non standard machine check architectures, in particular
WinChip C3 and Intel P5. I made those a separate CONFIG option
and kept them for now. The WinChip variant could be probably
removed without too much pain, it doesn't really do anything
interesting. P5 is also disabled by default (like it
was before) because many motherboards have it miswired, but
according to Alan Cox a few embedded setups use that one.
Forward ported/heavily changed version of old patch, original patch
included review/fixes from Thomas Gleixner, Bert Wesarg.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-04-29 00:07:31 +07:00
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/* By default disabled */
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2009-06-15 15:22:49 +07:00
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int mce_p5_enabled __read_mostly;
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x86, mce: use 64bit machine check code on 32bit
The 64bit machine check code is in many ways much better than
the 32bit machine check code: it is more specification compliant,
is cleaner, only has a single code base versus one per CPU,
has better infrastructure for recovery, has a cleaner way to communicate
with user space etc. etc.
Use the 64bit code for 32bit too.
This is the second attempt to do this. There was one a couple of years
ago to unify this code for 32bit and 64bit. Back then this ran into some
trouble with K7s and was reverted.
I believe this time the K7 problems (and some others) are addressed.
I went over the old handlers and was very careful to retain
all quirks.
But of course this needs a lot of testing on old systems. On newer
64bit capable systems I don't expect much problems because they have been
already tested with the 64bit kernel.
I made this a CONFIG for now that still allows to select the old
machine check code. This is mostly to make testing easier,
if someone runs into a problem we can ask them to try
with the CONFIG switched.
The new code is default y for more coverage.
Once there is confidence the 64bit code works well on older hardware
too the CONFIG_X86_OLD_MCE and the associated code can be easily
removed.
This causes a behaviour change for 32bit installations. They now
have to install the mcelog package to be able to log
corrected machine checks.
The 64bit machine check code only handles CPUs which support the
standard Intel machine check architecture described in the IA32 SDM.
The 32bit code has special support for some older CPUs which
have non standard machine check architectures, in particular
WinChip C3 and Intel P5. I made those a separate CONFIG option
and kept them for now. The WinChip variant could be probably
removed without too much pain, it doesn't really do anything
interesting. P5 is also disabled by default (like it
was before) because many motherboards have it miswired, but
according to Alan Cox a few embedded setups use that one.
Forward ported/heavily changed version of old patch, original patch
included review/fixes from Thomas Gleixner, Bert Wesarg.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
2009-04-29 00:07:31 +07:00
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2009-04-08 17:31:21 +07:00
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/* Machine check handler for Pentium class Intel CPUs: */
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2008-02-20 05:20:45 +07:00
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static void pentium_machine_check(struct pt_regs *regs, long error_code)
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2005-04-17 05:20:36 +07:00
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{
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u32 loaddr, hi, lotype;
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2009-04-08 17:31:21 +07:00
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2015-07-04 02:44:32 +07:00
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ist_enter(regs);
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2014-11-20 08:41:09 +07:00
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2005-04-17 05:20:36 +07:00
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rdmsr(MSR_IA32_P5_MC_ADDR, loaddr, hi);
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rdmsr(MSR_IA32_P5_MC_TYPE, lotype, hi);
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2009-04-08 17:31:21 +07:00
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2016-02-02 10:45:02 +07:00
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pr_emerg("CPU#%d: Machine Check Exception: 0x%8X (type 0x%8X).\n",
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smp_processor_id(), loaddr, lotype);
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2009-04-08 17:31:21 +07:00
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if (lotype & (1<<5)) {
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2016-02-02 10:45:02 +07:00
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pr_emerg("CPU#%d: Possible thermal failure (CPU on fire ?).\n",
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smp_processor_id());
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2009-04-08 17:31:21 +07:00
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}
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2013-01-21 13:47:39 +07:00
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add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
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2014-11-20 08:41:09 +07:00
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2015-07-04 02:44:32 +07:00
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ist_exit(regs);
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2005-04-17 05:20:36 +07:00
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}
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2009-04-08 17:31:21 +07:00
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/* Set up machine check reporting for processors with Intel style MCE: */
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2005-11-07 15:58:42 +07:00
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void intel_p5_mcheck_init(struct cpuinfo_x86 *c)
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2005-04-17 05:20:36 +07:00
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{
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u32 l, h;
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2008-02-20 05:20:45 +07:00
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2009-06-15 15:22:49 +07:00
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/* Default P5 to off as its often misconnected: */
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if (!mce_p5_enabled)
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2008-02-20 05:20:45 +07:00
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return;
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2005-04-17 05:20:36 +07:00
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2009-06-15 15:22:49 +07:00
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/* Check for MCE support: */
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if (!cpu_has(c, X86_FEATURE_MCE))
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2005-04-17 05:20:36 +07:00
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return;
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2009-04-08 17:31:21 +07:00
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2005-04-17 05:20:36 +07:00
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machine_check_vector = pentium_machine_check;
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2009-04-08 17:31:21 +07:00
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/* Make sure the vector pointer is visible before we enable MCEs: */
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2005-04-17 05:20:36 +07:00
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wmb();
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2009-04-08 17:31:21 +07:00
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/* Read registers before enabling: */
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2005-04-17 05:20:36 +07:00
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rdmsr(MSR_IA32_P5_MC_ADDR, l, h);
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rdmsr(MSR_IA32_P5_MC_TYPE, l, h);
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2016-02-02 10:45:02 +07:00
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pr_info("Intel old style machine check architecture supported.\n");
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2005-04-17 05:20:36 +07:00
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2009-04-08 17:31:21 +07:00
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/* Enable MCE: */
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2014-10-25 05:58:07 +07:00
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cr4_set_bits(X86_CR4_MCE);
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2016-02-02 10:45:02 +07:00
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pr_info("Intel old style machine check reporting enabled on CPU#%d.\n",
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smp_processor_id());
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2005-04-17 05:20:36 +07:00
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}
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