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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
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>
424 lines
11 KiB
C
424 lines
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_SPINLOCK_H
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#define __LINUX_SPINLOCK_H
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/*
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* include/linux/spinlock.h - generic spinlock/rwlock declarations
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*
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* here's the role of the various spinlock/rwlock related include files:
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*
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* on SMP builds:
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*
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* asm/spinlock_types.h: contains the arch_spinlock_t/arch_rwlock_t and the
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* initializers
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*
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* linux/spinlock_types.h:
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* defines the generic type and initializers
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*
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* asm/spinlock.h: contains the arch_spin_*()/etc. lowlevel
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* implementations, mostly inline assembly code
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*
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* (also included on UP-debug builds:)
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*
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* linux/spinlock_api_smp.h:
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* contains the prototypes for the _spin_*() APIs.
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*
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* linux/spinlock.h: builds the final spin_*() APIs.
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*
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* on UP builds:
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*
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* linux/spinlock_type_up.h:
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* contains the generic, simplified UP spinlock type.
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* (which is an empty structure on non-debug builds)
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*
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* linux/spinlock_types.h:
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* defines the generic type and initializers
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*
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* linux/spinlock_up.h:
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* contains the arch_spin_*()/etc. version of UP
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* builds. (which are NOPs on non-debug, non-preempt
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* builds)
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*
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* (included on UP-non-debug builds:)
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*
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* linux/spinlock_api_up.h:
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* builds the _spin_*() APIs.
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*
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* linux/spinlock.h: builds the final spin_*() APIs.
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*/
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#include <linux/typecheck.h>
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#include <linux/preempt.h>
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#include <linux/linkage.h>
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#include <linux/compiler.h>
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#include <linux/irqflags.h>
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#include <linux/thread_info.h>
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#include <linux/kernel.h>
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#include <linux/stringify.h>
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#include <linux/bottom_half.h>
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#include <asm/barrier.h>
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/*
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* Must define these before including other files, inline functions need them
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*/
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#define LOCK_SECTION_NAME ".text..lock."KBUILD_BASENAME
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#define LOCK_SECTION_START(extra) \
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".subsection 1\n\t" \
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extra \
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".ifndef " LOCK_SECTION_NAME "\n\t" \
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LOCK_SECTION_NAME ":\n\t" \
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".endif\n"
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#define LOCK_SECTION_END \
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".previous\n\t"
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#define __lockfunc __attribute__((section(".spinlock.text")))
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/*
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* Pull the arch_spinlock_t and arch_rwlock_t definitions:
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*/
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#include <linux/spinlock_types.h>
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/*
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* Pull the arch_spin*() functions/declarations (UP-nondebug doesn't need them):
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*/
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#ifdef CONFIG_SMP
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# include <asm/spinlock.h>
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#else
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# include <linux/spinlock_up.h>
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#endif
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#ifdef CONFIG_DEBUG_SPINLOCK
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extern void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,
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struct lock_class_key *key);
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# define raw_spin_lock_init(lock) \
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do { \
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static struct lock_class_key __key; \
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\
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__raw_spin_lock_init((lock), #lock, &__key); \
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} while (0)
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#else
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# define raw_spin_lock_init(lock) \
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do { *(lock) = __RAW_SPIN_LOCK_UNLOCKED(lock); } while (0)
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#endif
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#define raw_spin_is_locked(lock) arch_spin_is_locked(&(lock)->raw_lock)
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#ifdef CONFIG_GENERIC_LOCKBREAK
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#define raw_spin_is_contended(lock) ((lock)->break_lock)
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#else
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#ifdef arch_spin_is_contended
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#define raw_spin_is_contended(lock) arch_spin_is_contended(&(lock)->raw_lock)
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#else
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#define raw_spin_is_contended(lock) (((void)(lock), 0))
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#endif /*arch_spin_is_contended*/
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#endif
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/*
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* This barrier must provide two things:
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*
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* - it must guarantee a STORE before the spin_lock() is ordered against a
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* LOAD after it, see the comments at its two usage sites.
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*
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* - it must ensure the critical section is RCsc.
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*
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* The latter is important for cases where we observe values written by other
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* CPUs in spin-loops, without barriers, while being subject to scheduling.
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*
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* CPU0 CPU1 CPU2
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*
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* for (;;) {
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* if (READ_ONCE(X))
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* break;
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* }
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* X=1
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* <sched-out>
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* <sched-in>
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* r = X;
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*
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* without transitivity it could be that CPU1 observes X!=0 breaks the loop,
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* we get migrated and CPU2 sees X==0.
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*
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* Since most load-store architectures implement ACQUIRE with an smp_mb() after
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* the LL/SC loop, they need no further barriers. Similarly all our TSO
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* architectures imply an smp_mb() for each atomic instruction and equally don't
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* need more.
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*
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* Architectures that can implement ACQUIRE better need to take care.
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*/
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#ifndef smp_mb__after_spinlock
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#define smp_mb__after_spinlock() do { } while (0)
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#endif
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#ifdef CONFIG_DEBUG_SPINLOCK
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extern void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock);
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#define do_raw_spin_lock_flags(lock, flags) do_raw_spin_lock(lock)
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extern int do_raw_spin_trylock(raw_spinlock_t *lock);
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extern void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock);
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#else
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static inline void do_raw_spin_lock(raw_spinlock_t *lock) __acquires(lock)
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{
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__acquire(lock);
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arch_spin_lock(&lock->raw_lock);
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}
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static inline void
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do_raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long *flags) __acquires(lock)
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{
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__acquire(lock);
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arch_spin_lock_flags(&lock->raw_lock, *flags);
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}
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static inline int do_raw_spin_trylock(raw_spinlock_t *lock)
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{
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return arch_spin_trylock(&(lock)->raw_lock);
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}
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static inline void do_raw_spin_unlock(raw_spinlock_t *lock) __releases(lock)
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{
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arch_spin_unlock(&lock->raw_lock);
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__release(lock);
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}
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#endif
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/*
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* Define the various spin_lock methods. Note we define these
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* regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The
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* various methods are defined as nops in the case they are not
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* required.
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*/
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#define raw_spin_trylock(lock) __cond_lock(lock, _raw_spin_trylock(lock))
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#define raw_spin_lock(lock) _raw_spin_lock(lock)
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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# define raw_spin_lock_nested(lock, subclass) \
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_raw_spin_lock_nested(lock, subclass)
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# define raw_spin_lock_nest_lock(lock, nest_lock) \
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do { \
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typecheck(struct lockdep_map *, &(nest_lock)->dep_map);\
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_raw_spin_lock_nest_lock(lock, &(nest_lock)->dep_map); \
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} while (0)
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#else
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/*
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* Always evaluate the 'subclass' argument to avoid that the compiler
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* warns about set-but-not-used variables when building with
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* CONFIG_DEBUG_LOCK_ALLOC=n and with W=1.
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*/
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# define raw_spin_lock_nested(lock, subclass) \
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_raw_spin_lock(((void)(subclass), (lock)))
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# define raw_spin_lock_nest_lock(lock, nest_lock) _raw_spin_lock(lock)
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#endif
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#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
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#define raw_spin_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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flags = _raw_spin_lock_irqsave(lock); \
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} while (0)
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
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do { \
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typecheck(unsigned long, flags); \
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flags = _raw_spin_lock_irqsave_nested(lock, subclass); \
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} while (0)
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#else
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#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
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do { \
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typecheck(unsigned long, flags); \
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flags = _raw_spin_lock_irqsave(lock); \
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} while (0)
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#endif
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#else
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#define raw_spin_lock_irqsave(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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_raw_spin_lock_irqsave(lock, flags); \
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} while (0)
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#define raw_spin_lock_irqsave_nested(lock, flags, subclass) \
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raw_spin_lock_irqsave(lock, flags)
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#endif
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#define raw_spin_lock_irq(lock) _raw_spin_lock_irq(lock)
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#define raw_spin_lock_bh(lock) _raw_spin_lock_bh(lock)
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#define raw_spin_unlock(lock) _raw_spin_unlock(lock)
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#define raw_spin_unlock_irq(lock) _raw_spin_unlock_irq(lock)
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#define raw_spin_unlock_irqrestore(lock, flags) \
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do { \
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typecheck(unsigned long, flags); \
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_raw_spin_unlock_irqrestore(lock, flags); \
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} while (0)
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#define raw_spin_unlock_bh(lock) _raw_spin_unlock_bh(lock)
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#define raw_spin_trylock_bh(lock) \
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__cond_lock(lock, _raw_spin_trylock_bh(lock))
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#define raw_spin_trylock_irq(lock) \
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({ \
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local_irq_disable(); \
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raw_spin_trylock(lock) ? \
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1 : ({ local_irq_enable(); 0; }); \
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})
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#define raw_spin_trylock_irqsave(lock, flags) \
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({ \
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local_irq_save(flags); \
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raw_spin_trylock(lock) ? \
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1 : ({ local_irq_restore(flags); 0; }); \
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})
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/**
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* raw_spin_can_lock - would raw_spin_trylock() succeed?
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* @lock: the spinlock in question.
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*/
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#define raw_spin_can_lock(lock) (!raw_spin_is_locked(lock))
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/* Include rwlock functions */
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#include <linux/rwlock.h>
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/*
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* Pull the _spin_*()/_read_*()/_write_*() functions/declarations:
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*/
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#if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
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# include <linux/spinlock_api_smp.h>
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#else
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# include <linux/spinlock_api_up.h>
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#endif
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/*
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* Map the spin_lock functions to the raw variants for PREEMPT_RT=n
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*/
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static __always_inline raw_spinlock_t *spinlock_check(spinlock_t *lock)
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{
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return &lock->rlock;
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}
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#define spin_lock_init(_lock) \
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do { \
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spinlock_check(_lock); \
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raw_spin_lock_init(&(_lock)->rlock); \
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} while (0)
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static __always_inline void spin_lock(spinlock_t *lock)
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{
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raw_spin_lock(&lock->rlock);
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}
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static __always_inline void spin_lock_bh(spinlock_t *lock)
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{
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raw_spin_lock_bh(&lock->rlock);
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}
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static __always_inline int spin_trylock(spinlock_t *lock)
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{
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return raw_spin_trylock(&lock->rlock);
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}
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#define spin_lock_nested(lock, subclass) \
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do { \
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raw_spin_lock_nested(spinlock_check(lock), subclass); \
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} while (0)
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#define spin_lock_nest_lock(lock, nest_lock) \
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do { \
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raw_spin_lock_nest_lock(spinlock_check(lock), nest_lock); \
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} while (0)
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static __always_inline void spin_lock_irq(spinlock_t *lock)
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{
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raw_spin_lock_irq(&lock->rlock);
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}
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#define spin_lock_irqsave(lock, flags) \
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do { \
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raw_spin_lock_irqsave(spinlock_check(lock), flags); \
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} while (0)
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#define spin_lock_irqsave_nested(lock, flags, subclass) \
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do { \
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raw_spin_lock_irqsave_nested(spinlock_check(lock), flags, subclass); \
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} while (0)
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static __always_inline void spin_unlock(spinlock_t *lock)
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{
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raw_spin_unlock(&lock->rlock);
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}
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static __always_inline void spin_unlock_bh(spinlock_t *lock)
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{
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raw_spin_unlock_bh(&lock->rlock);
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}
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static __always_inline void spin_unlock_irq(spinlock_t *lock)
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{
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raw_spin_unlock_irq(&lock->rlock);
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}
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static __always_inline void spin_unlock_irqrestore(spinlock_t *lock, unsigned long flags)
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{
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raw_spin_unlock_irqrestore(&lock->rlock, flags);
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}
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static __always_inline int spin_trylock_bh(spinlock_t *lock)
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{
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return raw_spin_trylock_bh(&lock->rlock);
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}
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static __always_inline int spin_trylock_irq(spinlock_t *lock)
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{
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return raw_spin_trylock_irq(&lock->rlock);
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}
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#define spin_trylock_irqsave(lock, flags) \
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({ \
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raw_spin_trylock_irqsave(spinlock_check(lock), flags); \
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})
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static __always_inline int spin_is_locked(spinlock_t *lock)
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{
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return raw_spin_is_locked(&lock->rlock);
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}
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static __always_inline int spin_is_contended(spinlock_t *lock)
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{
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return raw_spin_is_contended(&lock->rlock);
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}
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static __always_inline int spin_can_lock(spinlock_t *lock)
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{
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return raw_spin_can_lock(&lock->rlock);
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}
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#define assert_spin_locked(lock) assert_raw_spin_locked(&(lock)->rlock)
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/*
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* Pull the atomic_t declaration:
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* (asm-mips/atomic.h needs above definitions)
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*/
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#include <linux/atomic.h>
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/**
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* atomic_dec_and_lock - lock on reaching reference count zero
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* @atomic: the atomic counter
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* @lock: the spinlock in question
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*
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* Decrements @atomic by 1. If the result is 0, returns true and locks
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* @lock. Returns false for all other cases.
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*/
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extern int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock);
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#define atomic_dec_and_lock(atomic, lock) \
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__cond_lock(lock, _atomic_dec_and_lock(atomic, lock))
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#endif /* __LINUX_SPINLOCK_H */
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