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 14:07:57 +00:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2017-06-20 10:19:09 +00:00
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#ifndef _LINUX_WAIT_BIT_H
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#define _LINUX_WAIT_BIT_H
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/*
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* Linux wait-bit related types and methods:
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*/
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#include <linux/wait.h>
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struct wait_bit_key {
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void *flags;
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int bit_nr;
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unsigned long timeout;
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};
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struct wait_bit_queue_entry {
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struct wait_bit_key key;
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struct wait_queue_entry wq_entry;
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};
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#define __WAIT_BIT_KEY_INITIALIZER(word, bit) \
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{ .flags = word, .bit_nr = bit, }
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typedef int wait_bit_action_f(struct wait_bit_key *key, int mode);
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2017-11-02 15:27:44 +00:00
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2017-06-20 10:19:09 +00:00
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void __wake_up_bit(struct wait_queue_head *wq_head, void *word, int bit);
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int __wait_on_bit(struct wait_queue_head *wq_head, struct wait_bit_queue_entry *wbq_entry, wait_bit_action_f *action, unsigned int mode);
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int __wait_on_bit_lock(struct wait_queue_head *wq_head, struct wait_bit_queue_entry *wbq_entry, wait_bit_action_f *action, unsigned int mode);
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void wake_up_bit(void *word, int bit);
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int out_of_line_wait_on_bit(void *word, int, wait_bit_action_f *action, unsigned int mode);
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int out_of_line_wait_on_bit_timeout(void *word, int, wait_bit_action_f *action, unsigned int mode, unsigned long timeout);
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int out_of_line_wait_on_bit_lock(void *word, int, wait_bit_action_f *action, unsigned int mode);
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struct wait_queue_head *bit_waitqueue(void *word, int bit);
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2017-03-05 12:09:07 +00:00
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extern void __init wait_bit_init(void);
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2017-06-20 10:19:09 +00:00
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int wake_bit_function(struct wait_queue_entry *wq_entry, unsigned mode, int sync, void *key);
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#define DEFINE_WAIT_BIT(name, word, bit) \
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struct wait_bit_queue_entry name = { \
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.key = __WAIT_BIT_KEY_INITIALIZER(word, bit), \
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.wq_entry = { \
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.private = current, \
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.func = wake_bit_function, \
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sched/wait: Disambiguate wq_entry->task_list and wq_head->task_list naming
So I've noticed a number of instances where it was not obvious from the
code whether ->task_list was for a wait-queue head or a wait-queue entry.
Furthermore, there's a number of wait-queue users where the lists are
not for 'tasks' but other entities (poll tables, etc.), in which case
the 'task_list' name is actively confusing.
To clear this all up, name the wait-queue head and entry list structure
fields unambiguously:
struct wait_queue_head::task_list => ::head
struct wait_queue_entry::task_list => ::entry
For example, this code:
rqw->wait.task_list.next != &wait->task_list
... is was pretty unclear (to me) what it's doing, while now it's written this way:
rqw->wait.head.next != &wait->entry
... which makes it pretty clear that we are iterating a list until we see the head.
Other examples are:
list_for_each_entry_safe(pos, next, &x->task_list, task_list) {
list_for_each_entry(wq, &fence->wait.task_list, task_list) {
... where it's unclear (to me) what we are iterating, and during review it's
hard to tell whether it's trying to walk a wait-queue entry (which would be
a bug), while now it's written as:
list_for_each_entry_safe(pos, next, &x->head, entry) {
list_for_each_entry(wq, &fence->wait.head, entry) {
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-06-20 10:06:46 +00:00
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.entry = \
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LIST_HEAD_INIT((name).wq_entry.entry), \
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2017-06-20 10:19:09 +00:00
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}, \
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}
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2017-11-02 15:27:44 +00:00
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extern int bit_wait(struct wait_bit_key *key, int mode);
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extern int bit_wait_io(struct wait_bit_key *key, int mode);
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extern int bit_wait_timeout(struct wait_bit_key *key, int mode);
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extern int bit_wait_io_timeout(struct wait_bit_key *key, int mode);
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2017-06-20 10:19:09 +00:00
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/**
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* wait_on_bit - wait for a bit to be cleared
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* @word: the word being waited on, a kernel virtual address
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* @bit: the bit of the word being waited on
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* @mode: the task state to sleep in
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*
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* There is a standard hashed waitqueue table for generic use. This
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* is the part of the hashtable's accessor API that waits on a bit.
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* For instance, if one were to have waiters on a bitflag, one would
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* call wait_on_bit() in threads waiting for the bit to clear.
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* One uses wait_on_bit() where one is waiting for the bit to clear,
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* but has no intention of setting it.
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* Returned value will be zero if the bit was cleared, or non-zero
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* if the process received a signal and the mode permitted wakeup
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* on that signal.
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*/
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static inline int
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wait_on_bit(unsigned long *word, int bit, unsigned mode)
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{
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might_sleep();
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if (!test_bit(bit, word))
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return 0;
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return out_of_line_wait_on_bit(word, bit,
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bit_wait,
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mode);
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}
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/**
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* wait_on_bit_io - wait for a bit to be cleared
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* @word: the word being waited on, a kernel virtual address
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* @bit: the bit of the word being waited on
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* @mode: the task state to sleep in
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*
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* Use the standard hashed waitqueue table to wait for a bit
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* to be cleared. This is similar to wait_on_bit(), but calls
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* io_schedule() instead of schedule() for the actual waiting.
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*
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* Returned value will be zero if the bit was cleared, or non-zero
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* if the process received a signal and the mode permitted wakeup
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* on that signal.
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*/
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static inline int
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wait_on_bit_io(unsigned long *word, int bit, unsigned mode)
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{
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might_sleep();
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if (!test_bit(bit, word))
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return 0;
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return out_of_line_wait_on_bit(word, bit,
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bit_wait_io,
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mode);
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}
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/**
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* wait_on_bit_timeout - wait for a bit to be cleared or a timeout elapses
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* @word: the word being waited on, a kernel virtual address
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* @bit: the bit of the word being waited on
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* @mode: the task state to sleep in
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* @timeout: timeout, in jiffies
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*
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* Use the standard hashed waitqueue table to wait for a bit
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* to be cleared. This is similar to wait_on_bit(), except also takes a
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* timeout parameter.
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*
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* Returned value will be zero if the bit was cleared before the
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* @timeout elapsed, or non-zero if the @timeout elapsed or process
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* received a signal and the mode permitted wakeup on that signal.
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*/
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static inline int
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wait_on_bit_timeout(unsigned long *word, int bit, unsigned mode,
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unsigned long timeout)
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{
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might_sleep();
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if (!test_bit(bit, word))
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return 0;
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return out_of_line_wait_on_bit_timeout(word, bit,
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bit_wait_timeout,
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mode, timeout);
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}
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/**
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* wait_on_bit_action - wait for a bit to be cleared
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* @word: the word being waited on, a kernel virtual address
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* @bit: the bit of the word being waited on
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* @action: the function used to sleep, which may take special actions
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* @mode: the task state to sleep in
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*
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* Use the standard hashed waitqueue table to wait for a bit
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* to be cleared, and allow the waiting action to be specified.
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* This is like wait_on_bit() but allows fine control of how the waiting
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* is done.
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*
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* Returned value will be zero if the bit was cleared, or non-zero
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* if the process received a signal and the mode permitted wakeup
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* on that signal.
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*/
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static inline int
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wait_on_bit_action(unsigned long *word, int bit, wait_bit_action_f *action,
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unsigned mode)
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{
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might_sleep();
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if (!test_bit(bit, word))
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return 0;
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return out_of_line_wait_on_bit(word, bit, action, mode);
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}
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/**
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* wait_on_bit_lock - wait for a bit to be cleared, when wanting to set it
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* @word: the word being waited on, a kernel virtual address
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* @bit: the bit of the word being waited on
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* @mode: the task state to sleep in
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*
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* There is a standard hashed waitqueue table for generic use. This
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* is the part of the hashtable's accessor API that waits on a bit
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* when one intends to set it, for instance, trying to lock bitflags.
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* For instance, if one were to have waiters trying to set bitflag
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* and waiting for it to clear before setting it, one would call
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* wait_on_bit() in threads waiting to be able to set the bit.
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* One uses wait_on_bit_lock() where one is waiting for the bit to
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* clear with the intention of setting it, and when done, clearing it.
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*
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* Returns zero if the bit was (eventually) found to be clear and was
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* set. Returns non-zero if a signal was delivered to the process and
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* the @mode allows that signal to wake the process.
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*/
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static inline int
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wait_on_bit_lock(unsigned long *word, int bit, unsigned mode)
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{
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might_sleep();
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if (!test_and_set_bit(bit, word))
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return 0;
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return out_of_line_wait_on_bit_lock(word, bit, bit_wait, mode);
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}
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/**
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* wait_on_bit_lock_io - wait for a bit to be cleared, when wanting to set it
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* @word: the word being waited on, a kernel virtual address
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* @bit: the bit of the word being waited on
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* @mode: the task state to sleep in
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*
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* Use the standard hashed waitqueue table to wait for a bit
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* to be cleared and then to atomically set it. This is similar
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* to wait_on_bit(), but calls io_schedule() instead of schedule()
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* for the actual waiting.
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*
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* Returns zero if the bit was (eventually) found to be clear and was
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* set. Returns non-zero if a signal was delivered to the process and
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* the @mode allows that signal to wake the process.
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*/
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static inline int
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wait_on_bit_lock_io(unsigned long *word, int bit, unsigned mode)
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{
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might_sleep();
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if (!test_and_set_bit(bit, word))
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return 0;
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return out_of_line_wait_on_bit_lock(word, bit, bit_wait_io, mode);
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}
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/**
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* wait_on_bit_lock_action - wait for a bit to be cleared, when wanting to set it
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* @word: the word being waited on, a kernel virtual address
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* @bit: the bit of the word being waited on
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* @action: the function used to sleep, which may take special actions
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* @mode: the task state to sleep in
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*
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* Use the standard hashed waitqueue table to wait for a bit
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* to be cleared and then to set it, and allow the waiting action
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* to be specified.
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* This is like wait_on_bit() but allows fine control of how the waiting
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* is done.
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*
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* Returns zero if the bit was (eventually) found to be clear and was
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* set. Returns non-zero if a signal was delivered to the process and
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* the @mode allows that signal to wake the process.
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*/
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static inline int
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wait_on_bit_lock_action(unsigned long *word, int bit, wait_bit_action_f *action,
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unsigned mode)
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{
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might_sleep();
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if (!test_and_set_bit(bit, word))
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return 0;
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return out_of_line_wait_on_bit_lock(word, bit, action, mode);
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}
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2018-03-15 10:40:33 +00:00
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extern void init_wait_var_entry(struct wait_bit_queue_entry *wbq_entry, void *var, int flags);
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extern void wake_up_var(void *var);
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extern wait_queue_head_t *__var_waitqueue(void *p);
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#define ___wait_var_event(var, condition, state, exclusive, ret, cmd) \
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({ \
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__label__ __out; \
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struct wait_queue_head *__wq_head = __var_waitqueue(var); \
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struct wait_bit_queue_entry __wbq_entry; \
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long __ret = ret; /* explicit shadow */ \
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\
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init_wait_var_entry(&__wbq_entry, var, \
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exclusive ? WQ_FLAG_EXCLUSIVE : 0); \
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for (;;) { \
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long __int = prepare_to_wait_event(__wq_head, \
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&__wbq_entry.wq_entry, \
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state); \
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if (condition) \
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break; \
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\
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if (___wait_is_interruptible(state) && __int) { \
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__ret = __int; \
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goto __out; \
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} \
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\
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cmd; \
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} \
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finish_wait(__wq_head, &__wbq_entry.wq_entry); \
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__out: __ret; \
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})
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#define __wait_var_event(var, condition) \
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___wait_var_event(var, condition, TASK_UNINTERRUPTIBLE, 0, 0, \
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schedule())
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#define wait_var_event(var, condition) \
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do { \
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might_sleep(); \
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if (condition) \
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break; \
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__wait_var_event(var, condition); \
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} while (0)
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#define __wait_var_event_killable(var, condition) \
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___wait_var_event(var, condition, TASK_KILLABLE, 0, 0, \
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schedule())
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#define wait_var_event_killable(var, condition) \
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({ \
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int __ret = 0; \
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might_sleep(); \
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if (!(condition)) \
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__ret = __wait_var_event_killable(var, condition); \
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__ret; \
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})
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#define __wait_var_event_timeout(var, condition, timeout) \
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___wait_var_event(var, ___wait_cond_timeout(condition), \
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TASK_UNINTERRUPTIBLE, 0, timeout, \
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__ret = schedule_timeout(__ret))
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#define wait_var_event_timeout(var, condition, timeout) \
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({ \
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long __ret = timeout; \
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might_sleep(); \
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if (!___wait_cond_timeout(condition)) \
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__ret = __wait_var_event_timeout(var, condition, timeout); \
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__ret; \
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})
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2018-05-01 22:07:55 +00:00
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/**
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* clear_and_wake_up_bit - clear a bit and wake up anyone waiting on that bit
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*
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* @bit: the bit of the word being waited on
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* @word: the word being waited on, a kernel virtual address
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*
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* You can use this helper if bitflags are manipulated atomically rather than
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* non-atomically under a lock.
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*/
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static inline void clear_and_wake_up_bit(int bit, void *word)
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{
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clear_bit_unlock(bit, word);
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/* See wake_up_bit() for which memory barrier you need to use. */
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smp_mb__after_atomic();
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wake_up_bit(word, bit);
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}
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2017-06-20 10:19:09 +00:00
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#endif /* _LINUX_WAIT_BIT_H */
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