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 22:07:57 +08:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2006-07-03 15:24:42 +08:00
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/*
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* include/linux/irqflags.h
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*
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* IRQ flags tracing: follow the state of the hardirq and softirq flags and
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* provide callbacks for transitions between ON and OFF states.
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*
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* This file gets included from lowlevel asm headers too, to provide
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* wrapped versions of the local_irq_*() APIs, based on the
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* raw_local_irq_*() macros from the lowlevel headers.
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*/
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#ifndef _LINUX_TRACE_IRQFLAGS_H
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#define _LINUX_TRACE_IRQFLAGS_H
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2008-07-25 16:45:25 +08:00
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#include <linux/typecheck.h>
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2010-10-07 21:08:55 +08:00
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#include <asm/irqflags.h>
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2020-05-25 18:22:41 +08:00
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#include <asm/percpu.h>
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2008-07-25 16:45:25 +08:00
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2020-03-20 19:56:41 +08:00
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/* Currently lockdep_softirqs_on/off is used only by lockdep */
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2018-07-31 06:24:23 +08:00
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#ifdef CONFIG_PROVE_LOCKING
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2020-03-20 19:56:41 +08:00
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extern void lockdep_softirqs_on(unsigned long ip);
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extern void lockdep_softirqs_off(unsigned long ip);
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2020-03-18 21:22:03 +08:00
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extern void lockdep_hardirqs_on_prepare(unsigned long ip);
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2018-08-07 03:50:58 +08:00
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extern void lockdep_hardirqs_on(unsigned long ip);
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extern void lockdep_hardirqs_off(unsigned long ip);
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2018-07-31 06:24:23 +08:00
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#else
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2020-03-20 19:56:41 +08:00
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static inline void lockdep_softirqs_on(unsigned long ip) { }
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static inline void lockdep_softirqs_off(unsigned long ip) { }
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2020-03-18 21:22:03 +08:00
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static inline void lockdep_hardirqs_on_prepare(unsigned long ip) { }
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2018-08-07 03:50:58 +08:00
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static inline void lockdep_hardirqs_on(unsigned long ip) { }
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static inline void lockdep_hardirqs_off(unsigned long ip) { }
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2018-07-31 06:24:23 +08:00
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#endif
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#ifdef CONFIG_TRACE_IRQFLAGS
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2020-05-25 18:22:41 +08:00
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DECLARE_PER_CPU(int, hardirqs_enabled);
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DECLARE_PER_CPU(int, hardirq_context);
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2020-03-04 20:09:50 +08:00
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extern void trace_hardirqs_on_prepare(void);
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2020-05-30 05:27:40 +08:00
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extern void trace_hardirqs_off_finish(void);
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2008-05-13 03:20:42 +08:00
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extern void trace_hardirqs_on(void);
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extern void trace_hardirqs_off(void);
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2020-05-27 19:03:26 +08:00
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# define lockdep_hardirq_context() (this_cpu_read(hardirq_context))
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2020-03-20 19:56:42 +08:00
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# define lockdep_softirq_context(p) ((p)->softirq_context)
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2020-05-27 19:03:26 +08:00
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# define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled))
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2020-03-20 19:56:42 +08:00
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# define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
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2020-05-25 18:22:41 +08:00
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# define lockdep_hardirq_enter() \
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do { \
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if (this_cpu_inc_return(hardirq_context) == 1) \
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current->hardirq_threaded = 0; \
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lockdep: Introduce wait-type checks
Extend lockdep to validate lock wait-type context.
The current wait-types are:
LD_WAIT_FREE, /* wait free, rcu etc.. */
LD_WAIT_SPIN, /* spin loops, raw_spinlock_t etc.. */
LD_WAIT_CONFIG, /* CONFIG_PREEMPT_LOCK, spinlock_t etc.. */
LD_WAIT_SLEEP, /* sleeping locks, mutex_t etc.. */
Where lockdep validates that the current lock (the one being acquired)
fits in the current wait-context (as generated by the held stack).
This ensures that there is no attempt to acquire mutexes while holding
spinlocks, to acquire spinlocks while holding raw_spinlocks and so on. In
other words, its a more fancy might_sleep().
Obviously RCU made the entire ordeal more complex than a simple single
value test because RCU can be acquired in (pretty much) any context and
while it presents a context to nested locks it is not the same as it
got acquired in.
Therefore its necessary to split the wait_type into two values, one
representing the acquire (outer) and one representing the nested context
(inner). For most 'normal' locks these two are the same.
[ To make static initialization easier we have the rule that:
.outer == INV means .outer == .inner; because INV == 0. ]
It further means that its required to find the minimal .inner of the held
stack to compare against the outer of the new lock; because while 'normal'
RCU presents a CONFIG type to nested locks, if it is taken while already
holding a SPIN type it obviously doesn't relax the rules.
Below is an example output generated by the trivial test code:
raw_spin_lock(&foo);
spin_lock(&bar);
spin_unlock(&bar);
raw_spin_unlock(&foo);
[ BUG: Invalid wait context ]
-----------------------------
swapper/0/1 is trying to lock:
ffffc90000013f20 (&bar){....}-{3:3}, at: kernel_init+0xdb/0x187
other info that might help us debug this:
1 lock held by swapper/0/1:
#0: ffffc90000013ee0 (&foo){+.+.}-{2:2}, at: kernel_init+0xd1/0x187
The way to read it is to look at the new -{n,m} part in the lock
description; -{3:3} for the attempted lock, and try and match that up to
the held locks, which in this case is the one: -{2,2}.
This tells that the acquiring lock requires a more relaxed environment than
presented by the lock stack.
Currently only the normal locks and RCU are converted, the rest of the
lockdep users defaults to .inner = INV which is ignored. More conversions
can be done when desired.
The check for spinlock_t nesting is not enabled by default. It's a separate
config option for now as there are known problems which are currently
addressed. The config option allows to identify these problems and to
verify that the solutions found are indeed solving them.
The config switch will be removed and the checks will permanently enabled
once the vast majority of issues has been addressed.
[ bigeasy: Move LD_WAIT_FREE,… out of CONFIG_LOCKDEP to avoid compile
failure with CONFIG_DEBUG_SPINLOCK + !CONFIG_LOCKDEP]
[ tglx: Add the config option ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200321113242.427089655@linutronix.de
2020-03-21 19:26:01 +08:00
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} while (0)
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2020-03-31 10:14:28 +08:00
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# define lockdep_hardirq_threaded() \
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lockdep: Introduce wait-type checks
Extend lockdep to validate lock wait-type context.
The current wait-types are:
LD_WAIT_FREE, /* wait free, rcu etc.. */
LD_WAIT_SPIN, /* spin loops, raw_spinlock_t etc.. */
LD_WAIT_CONFIG, /* CONFIG_PREEMPT_LOCK, spinlock_t etc.. */
LD_WAIT_SLEEP, /* sleeping locks, mutex_t etc.. */
Where lockdep validates that the current lock (the one being acquired)
fits in the current wait-context (as generated by the held stack).
This ensures that there is no attempt to acquire mutexes while holding
spinlocks, to acquire spinlocks while holding raw_spinlocks and so on. In
other words, its a more fancy might_sleep().
Obviously RCU made the entire ordeal more complex than a simple single
value test because RCU can be acquired in (pretty much) any context and
while it presents a context to nested locks it is not the same as it
got acquired in.
Therefore its necessary to split the wait_type into two values, one
representing the acquire (outer) and one representing the nested context
(inner). For most 'normal' locks these two are the same.
[ To make static initialization easier we have the rule that:
.outer == INV means .outer == .inner; because INV == 0. ]
It further means that its required to find the minimal .inner of the held
stack to compare against the outer of the new lock; because while 'normal'
RCU presents a CONFIG type to nested locks, if it is taken while already
holding a SPIN type it obviously doesn't relax the rules.
Below is an example output generated by the trivial test code:
raw_spin_lock(&foo);
spin_lock(&bar);
spin_unlock(&bar);
raw_spin_unlock(&foo);
[ BUG: Invalid wait context ]
-----------------------------
swapper/0/1 is trying to lock:
ffffc90000013f20 (&bar){....}-{3:3}, at: kernel_init+0xdb/0x187
other info that might help us debug this:
1 lock held by swapper/0/1:
#0: ffffc90000013ee0 (&foo){+.+.}-{2:2}, at: kernel_init+0xd1/0x187
The way to read it is to look at the new -{n,m} part in the lock
description; -{3:3} for the attempted lock, and try and match that up to
the held locks, which in this case is the one: -{2,2}.
This tells that the acquiring lock requires a more relaxed environment than
presented by the lock stack.
Currently only the normal locks and RCU are converted, the rest of the
lockdep users defaults to .inner = INV which is ignored. More conversions
can be done when desired.
The check for spinlock_t nesting is not enabled by default. It's a separate
config option for now as there are known problems which are currently
addressed. The config option allows to identify these problems and to
verify that the solutions found are indeed solving them.
The config switch will be removed and the checks will permanently enabled
once the vast majority of issues has been addressed.
[ bigeasy: Move LD_WAIT_FREE,… out of CONFIG_LOCKDEP to avoid compile
failure with CONFIG_DEBUG_SPINLOCK + !CONFIG_LOCKDEP]
[ tglx: Add the config option ]
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200321113242.427089655@linutronix.de
2020-03-21 19:26:01 +08:00
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do { \
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current->hardirq_threaded = 1; \
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2017-08-07 15:12:52 +08:00
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} while (0)
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2020-03-20 19:56:40 +08:00
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# define lockdep_hardirq_exit() \
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2017-08-07 15:12:52 +08:00
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do { \
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2020-05-25 18:22:41 +08:00
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this_cpu_dec(hardirq_context); \
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2017-08-07 15:12:52 +08:00
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} while (0)
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# define lockdep_softirq_enter() \
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do { \
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current->softirq_context++; \
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} while (0)
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# define lockdep_softirq_exit() \
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do { \
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current->softirq_context--; \
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} while (0)
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2020-03-21 19:26:02 +08:00
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# define lockdep_hrtimer_enter(__hrtimer) \
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2020-04-01 04:18:49 +08:00
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({ \
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bool __expires_hardirq = true; \
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\
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if (!__hrtimer->is_hard) { \
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current->irq_config = 1; \
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__expires_hardirq = false; \
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} \
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__expires_hardirq; \
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})
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2020-03-21 19:26:02 +08:00
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2020-04-01 04:18:49 +08:00
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# define lockdep_hrtimer_exit(__expires_hardirq) \
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do { \
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if (!__expires_hardirq) \
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2020-03-21 19:26:02 +08:00
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current->irq_config = 0; \
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2020-04-01 04:18:49 +08:00
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} while (0)
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2020-03-21 19:26:02 +08:00
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2020-03-21 19:26:04 +08:00
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# define lockdep_posixtimer_enter() \
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do { \
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current->irq_config = 1; \
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} while (0)
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# define lockdep_posixtimer_exit() \
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do { \
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current->irq_config = 0; \
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} while (0)
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2020-03-21 19:26:03 +08:00
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# define lockdep_irq_work_enter(__work) \
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do { \
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if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
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current->irq_config = 1; \
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} while (0)
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# define lockdep_irq_work_exit(__work) \
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do { \
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if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
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current->irq_config = 0; \
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} while (0)
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2006-07-03 15:24:42 +08:00
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#else
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2020-03-04 20:09:50 +08:00
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# define trace_hardirqs_on_prepare() do { } while (0)
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2020-05-30 05:27:40 +08:00
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# define trace_hardirqs_off_finish() do { } while (0)
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2006-07-03 15:24:42 +08:00
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# define trace_hardirqs_on() do { } while (0)
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# define trace_hardirqs_off() do { } while (0)
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2020-05-27 19:03:26 +08:00
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# define lockdep_hardirq_context() 0
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2020-03-20 19:56:42 +08:00
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# define lockdep_softirq_context(p) 0
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2020-05-27 19:03:26 +08:00
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# define lockdep_hardirqs_enabled() 0
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2020-03-20 19:56:42 +08:00
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# define lockdep_softirqs_enabled(p) 0
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2020-03-20 19:56:40 +08:00
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# define lockdep_hardirq_enter() do { } while (0)
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2020-03-31 10:14:28 +08:00
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# define lockdep_hardirq_threaded() do { } while (0)
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2020-03-20 19:56:40 +08:00
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# define lockdep_hardirq_exit() do { } while (0)
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2009-03-13 08:30:40 +08:00
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# define lockdep_softirq_enter() do { } while (0)
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# define lockdep_softirq_exit() do { } while (0)
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2020-04-01 04:18:49 +08:00
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# define lockdep_hrtimer_enter(__hrtimer) false
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# define lockdep_hrtimer_exit(__context) do { } while (0)
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2020-03-21 19:26:04 +08:00
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# define lockdep_posixtimer_enter() do { } while (0)
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# define lockdep_posixtimer_exit() do { } while (0)
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2020-03-21 19:26:03 +08:00
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# define lockdep_irq_work_enter(__work) do { } while (0)
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# define lockdep_irq_work_exit(__work) do { } while (0)
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2006-07-03 15:24:42 +08:00
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#endif
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2008-05-13 03:20:42 +08:00
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#if defined(CONFIG_IRQSOFF_TRACER) || \
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defined(CONFIG_PREEMPT_TRACER)
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2008-05-13 03:20:42 +08:00
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extern void stop_critical_timings(void);
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extern void start_critical_timings(void);
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#else
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# define stop_critical_timings() do { } while (0)
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# define start_critical_timings() do { } while (0)
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#endif
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2010-10-07 21:08:55 +08:00
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/*
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* Wrap the arch provided IRQ routines to provide appropriate checks.
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*/
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#define raw_local_irq_disable() arch_local_irq_disable()
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#define raw_local_irq_enable() arch_local_irq_enable()
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#define raw_local_irq_save(flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = arch_local_irq_save(); \
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} while (0)
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#define raw_local_irq_restore(flags) \
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do { \
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typecheck(unsigned long, flags); \
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arch_local_irq_restore(flags); \
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} while (0)
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#define raw_local_save_flags(flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = arch_local_save_flags(); \
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} while (0)
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#define raw_irqs_disabled_flags(flags) \
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({ \
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typecheck(unsigned long, flags); \
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arch_irqs_disabled_flags(flags); \
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})
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#define raw_irqs_disabled() (arch_irqs_disabled())
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#define raw_safe_halt() arch_safe_halt()
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2006-07-03 15:24:42 +08:00
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2010-10-07 21:08:55 +08:00
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/*
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* The local_irq_*() APIs are equal to the raw_local_irq*()
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* if !TRACE_IRQFLAGS.
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*/
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2015-01-20 21:00:46 +08:00
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#ifdef CONFIG_TRACE_IRQFLAGS
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2006-07-03 15:24:42 +08:00
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#define local_irq_enable() \
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do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
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#define local_irq_disable() \
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do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
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2008-07-25 16:45:25 +08:00
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#define local_irq_save(flags) \
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do { \
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raw_local_irq_save(flags); \
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trace_hardirqs_off(); \
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} while (0)
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2006-07-03 15:24:42 +08:00
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2008-07-25 16:45:25 +08:00
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#define local_irq_restore(flags) \
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do { \
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if (raw_irqs_disabled_flags(flags)) { \
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raw_local_irq_restore(flags); \
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trace_hardirqs_off(); \
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} else { \
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trace_hardirqs_on(); \
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raw_local_irq_restore(flags); \
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} \
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2006-07-03 15:24:42 +08:00
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} while (0)
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2010-10-07 21:08:55 +08:00
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#define safe_halt() \
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do { \
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trace_hardirqs_on(); \
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raw_safe_halt(); \
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2008-07-25 16:45:25 +08:00
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} while (0)
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2006-07-03 15:24:42 +08:00
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2015-01-20 21:00:46 +08:00
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#else /* !CONFIG_TRACE_IRQFLAGS */
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2010-10-07 21:08:55 +08:00
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#define local_irq_enable() do { raw_local_irq_enable(); } while (0)
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#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
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#define local_irq_save(flags) \
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do { \
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raw_local_irq_save(flags); \
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} while (0)
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#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
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#define safe_halt() do { raw_safe_halt(); } while (0)
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2015-01-20 21:00:46 +08:00
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#endif /* CONFIG_TRACE_IRQFLAGS */
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#define local_save_flags(flags) raw_local_save_flags(flags)
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/*
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* Some architectures don't define arch_irqs_disabled(), so even if either
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* definition would be fine we need to use different ones for the time being
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* to avoid build issues.
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*/
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#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
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#define irqs_disabled() \
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({ \
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|
unsigned long _flags; \
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|
raw_local_save_flags(_flags); \
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|
raw_irqs_disabled_flags(_flags); \
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})
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#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
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|
#define irqs_disabled() raw_irqs_disabled()
|
2009-10-22 11:39:28 +08:00
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#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
|
2006-07-03 15:24:42 +08:00
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|
2015-01-20 21:00:46 +08:00
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|
#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
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|
2006-07-03 15:24:42 +08:00
|
|
|
#endif
|