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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>
227 lines
7.3 KiB
C
227 lines
7.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* linux/include/linux/clockchips.h
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*
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* This file contains the structure definitions for clockchips.
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*
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* If you are not a clockchip, or the time of day code, you should
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* not be including this file!
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*/
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#ifndef _LINUX_CLOCKCHIPS_H
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#define _LINUX_CLOCKCHIPS_H
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#ifdef CONFIG_GENERIC_CLOCKEVENTS
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# include <linux/clocksource.h>
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# include <linux/cpumask.h>
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# include <linux/ktime.h>
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# include <linux/notifier.h>
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struct clock_event_device;
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struct module;
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/*
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* Possible states of a clock event device.
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*
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* DETACHED: Device is not used by clockevents core. Initial state or can be
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* reached from SHUTDOWN.
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* SHUTDOWN: Device is powered-off. Can be reached from PERIODIC or ONESHOT.
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* PERIODIC: Device is programmed to generate events periodically. Can be
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* reached from DETACHED or SHUTDOWN.
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* ONESHOT: Device is programmed to generate event only once. Can be reached
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* from DETACHED or SHUTDOWN.
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* ONESHOT_STOPPED: Device was programmed in ONESHOT mode and is temporarily
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* stopped.
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*/
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enum clock_event_state {
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CLOCK_EVT_STATE_DETACHED,
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CLOCK_EVT_STATE_SHUTDOWN,
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CLOCK_EVT_STATE_PERIODIC,
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CLOCK_EVT_STATE_ONESHOT,
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CLOCK_EVT_STATE_ONESHOT_STOPPED,
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};
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/*
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* Clock event features
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*/
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# define CLOCK_EVT_FEAT_PERIODIC 0x000001
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# define CLOCK_EVT_FEAT_ONESHOT 0x000002
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# define CLOCK_EVT_FEAT_KTIME 0x000004
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/*
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* x86(64) specific (mis)features:
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*
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* - Clockevent source stops in C3 State and needs broadcast support.
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* - Local APIC timer is used as a dummy device.
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*/
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# define CLOCK_EVT_FEAT_C3STOP 0x000008
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# define CLOCK_EVT_FEAT_DUMMY 0x000010
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/*
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* Core shall set the interrupt affinity dynamically in broadcast mode
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*/
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# define CLOCK_EVT_FEAT_DYNIRQ 0x000020
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# define CLOCK_EVT_FEAT_PERCPU 0x000040
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/*
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* Clockevent device is based on a hrtimer for broadcast
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*/
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# define CLOCK_EVT_FEAT_HRTIMER 0x000080
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/**
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* struct clock_event_device - clock event device descriptor
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* @event_handler: Assigned by the framework to be called by the low
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* level handler of the event source
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* @set_next_event: set next event function using a clocksource delta
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* @set_next_ktime: set next event function using a direct ktime value
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* @next_event: local storage for the next event in oneshot mode
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* @max_delta_ns: maximum delta value in ns
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* @min_delta_ns: minimum delta value in ns
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* @mult: nanosecond to cycles multiplier
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* @shift: nanoseconds to cycles divisor (power of two)
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* @state_use_accessors:current state of the device, assigned by the core code
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* @features: features
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* @retries: number of forced programming retries
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* @set_state_periodic: switch state to periodic
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* @set_state_oneshot: switch state to oneshot
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* @set_state_oneshot_stopped: switch state to oneshot_stopped
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* @set_state_shutdown: switch state to shutdown
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* @tick_resume: resume clkevt device
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* @broadcast: function to broadcast events
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* @min_delta_ticks: minimum delta value in ticks stored for reconfiguration
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* @max_delta_ticks: maximum delta value in ticks stored for reconfiguration
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* @name: ptr to clock event name
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* @rating: variable to rate clock event devices
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* @irq: IRQ number (only for non CPU local devices)
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* @bound_on: Bound on CPU
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* @cpumask: cpumask to indicate for which CPUs this device works
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* @list: list head for the management code
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* @owner: module reference
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*/
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struct clock_event_device {
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void (*event_handler)(struct clock_event_device *);
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int (*set_next_event)(unsigned long evt, struct clock_event_device *);
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int (*set_next_ktime)(ktime_t expires, struct clock_event_device *);
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ktime_t next_event;
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u64 max_delta_ns;
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u64 min_delta_ns;
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u32 mult;
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u32 shift;
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enum clock_event_state state_use_accessors;
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unsigned int features;
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unsigned long retries;
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int (*set_state_periodic)(struct clock_event_device *);
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int (*set_state_oneshot)(struct clock_event_device *);
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int (*set_state_oneshot_stopped)(struct clock_event_device *);
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int (*set_state_shutdown)(struct clock_event_device *);
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int (*tick_resume)(struct clock_event_device *);
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void (*broadcast)(const struct cpumask *mask);
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void (*suspend)(struct clock_event_device *);
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void (*resume)(struct clock_event_device *);
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unsigned long min_delta_ticks;
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unsigned long max_delta_ticks;
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const char *name;
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int rating;
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int irq;
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int bound_on;
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const struct cpumask *cpumask;
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struct list_head list;
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struct module *owner;
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} ____cacheline_aligned;
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/* Helpers to verify state of a clockevent device */
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static inline bool clockevent_state_detached(struct clock_event_device *dev)
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{
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return dev->state_use_accessors == CLOCK_EVT_STATE_DETACHED;
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}
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static inline bool clockevent_state_shutdown(struct clock_event_device *dev)
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{
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return dev->state_use_accessors == CLOCK_EVT_STATE_SHUTDOWN;
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}
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static inline bool clockevent_state_periodic(struct clock_event_device *dev)
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{
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return dev->state_use_accessors == CLOCK_EVT_STATE_PERIODIC;
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}
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static inline bool clockevent_state_oneshot(struct clock_event_device *dev)
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{
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return dev->state_use_accessors == CLOCK_EVT_STATE_ONESHOT;
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}
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static inline bool clockevent_state_oneshot_stopped(struct clock_event_device *dev)
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{
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return dev->state_use_accessors == CLOCK_EVT_STATE_ONESHOT_STOPPED;
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}
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/*
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* Calculate a multiplication factor for scaled math, which is used to convert
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* nanoseconds based values to clock ticks:
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*
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* clock_ticks = (nanoseconds * factor) >> shift.
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*
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* div_sc is the rearranged equation to calculate a factor from a given clock
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* ticks / nanoseconds ratio:
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*
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* factor = (clock_ticks << shift) / nanoseconds
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*/
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static inline unsigned long
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div_sc(unsigned long ticks, unsigned long nsec, int shift)
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{
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u64 tmp = ((u64)ticks) << shift;
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do_div(tmp, nsec);
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return (unsigned long) tmp;
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}
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/* Clock event layer functions */
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extern u64 clockevent_delta2ns(unsigned long latch, struct clock_event_device *evt);
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extern void clockevents_register_device(struct clock_event_device *dev);
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extern int clockevents_unbind_device(struct clock_event_device *ced, int cpu);
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extern void clockevents_config_and_register(struct clock_event_device *dev,
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u32 freq, unsigned long min_delta,
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unsigned long max_delta);
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extern int clockevents_update_freq(struct clock_event_device *ce, u32 freq);
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static inline void
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clockevents_calc_mult_shift(struct clock_event_device *ce, u32 freq, u32 maxsec)
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{
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return clocks_calc_mult_shift(&ce->mult, &ce->shift, NSEC_PER_SEC, freq, maxsec);
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}
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extern void clockevents_suspend(void);
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extern void clockevents_resume(void);
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# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
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# ifdef CONFIG_ARCH_HAS_TICK_BROADCAST
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extern void tick_broadcast(const struct cpumask *mask);
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# else
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# define tick_broadcast NULL
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# endif
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extern int tick_receive_broadcast(void);
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# endif
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# if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
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extern void tick_setup_hrtimer_broadcast(void);
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extern int tick_check_broadcast_expired(void);
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# else
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static inline int tick_check_broadcast_expired(void) { return 0; }
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static inline void tick_setup_hrtimer_broadcast(void) { }
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# endif
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#else /* !CONFIG_GENERIC_CLOCKEVENTS: */
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static inline void clockevents_suspend(void) { }
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static inline void clockevents_resume(void) { }
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static inline int tick_check_broadcast_expired(void) { return 0; }
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static inline void tick_setup_hrtimer_broadcast(void) { }
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#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
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#endif /* _LINUX_CLOCKCHIPS_H */
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