![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>
235 lines
7.4 KiB
C
235 lines
7.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Generic RTC interface.
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* This version contains the part of the user interface to the Real Time Clock
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* service. It is used with both the legacy mc146818 and also EFI
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* Struct rtc_time and first 12 ioctl by Paul Gortmaker, 1996 - separated out
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* from <linux/mc146818rtc.h> to this file for 2.4 kernels.
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*
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* Copyright (C) 1999 Hewlett-Packard Co.
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* Copyright (C) 1999 Stephane Eranian <eranian@hpl.hp.com>
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*/
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#ifndef _LINUX_RTC_H_
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#define _LINUX_RTC_H_
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#include <linux/types.h>
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#include <linux/interrupt.h>
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#include <linux/nvmem-provider.h>
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#include <uapi/linux/rtc.h>
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extern int rtc_month_days(unsigned int month, unsigned int year);
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extern int rtc_year_days(unsigned int day, unsigned int month, unsigned int year);
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extern int rtc_valid_tm(struct rtc_time *tm);
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extern time64_t rtc_tm_to_time64(struct rtc_time *tm);
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extern void rtc_time64_to_tm(time64_t time, struct rtc_time *tm);
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ktime_t rtc_tm_to_ktime(struct rtc_time tm);
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struct rtc_time rtc_ktime_to_tm(ktime_t kt);
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/*
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* rtc_tm_sub - Return the difference in seconds.
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*/
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static inline time64_t rtc_tm_sub(struct rtc_time *lhs, struct rtc_time *rhs)
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{
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return rtc_tm_to_time64(lhs) - rtc_tm_to_time64(rhs);
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}
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static inline void rtc_time_to_tm(unsigned long time, struct rtc_time *tm)
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{
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rtc_time64_to_tm(time, tm);
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}
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static inline int rtc_tm_to_time(struct rtc_time *tm, unsigned long *time)
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{
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*time = rtc_tm_to_time64(tm);
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return 0;
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}
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#include <linux/device.h>
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#include <linux/seq_file.h>
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#include <linux/cdev.h>
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#include <linux/poll.h>
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#include <linux/mutex.h>
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#include <linux/timerqueue.h>
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#include <linux/workqueue.h>
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extern struct class *rtc_class;
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/*
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* For these RTC methods the device parameter is the physical device
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* on whatever bus holds the hardware (I2C, Platform, SPI, etc), which
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* was passed to rtc_device_register(). Its driver_data normally holds
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* device state, including the rtc_device pointer for the RTC.
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*
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* Most of these methods are called with rtc_device.ops_lock held,
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* through the rtc_*(struct rtc_device *, ...) calls.
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*
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* The (current) exceptions are mostly filesystem hooks:
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* - the proc() hook for procfs
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* - non-ioctl() chardev hooks: open(), release(), read_callback()
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*
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* REVISIT those periodic irq calls *do* have ops_lock when they're
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* issued through ioctl() ...
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*/
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struct rtc_class_ops {
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int (*ioctl)(struct device *, unsigned int, unsigned long);
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int (*read_time)(struct device *, struct rtc_time *);
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int (*set_time)(struct device *, struct rtc_time *);
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int (*read_alarm)(struct device *, struct rtc_wkalrm *);
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int (*set_alarm)(struct device *, struct rtc_wkalrm *);
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int (*proc)(struct device *, struct seq_file *);
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int (*set_mmss64)(struct device *, time64_t secs);
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int (*set_mmss)(struct device *, unsigned long secs);
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int (*read_callback)(struct device *, int data);
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int (*alarm_irq_enable)(struct device *, unsigned int enabled);
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int (*read_offset)(struct device *, long *offset);
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int (*set_offset)(struct device *, long offset);
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};
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#define RTC_DEVICE_NAME_SIZE 20
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typedef struct rtc_task {
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void (*func)(void *private_data);
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void *private_data;
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} rtc_task_t;
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struct rtc_timer {
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struct rtc_task task;
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struct timerqueue_node node;
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ktime_t period;
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int enabled;
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};
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/* flags */
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#define RTC_DEV_BUSY 0
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struct rtc_device {
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struct device dev;
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struct module *owner;
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int id;
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const struct rtc_class_ops *ops;
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struct mutex ops_lock;
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struct cdev char_dev;
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unsigned long flags;
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unsigned long irq_data;
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spinlock_t irq_lock;
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wait_queue_head_t irq_queue;
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struct fasync_struct *async_queue;
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struct rtc_task *irq_task;
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spinlock_t irq_task_lock;
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int irq_freq;
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int max_user_freq;
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struct timerqueue_head timerqueue;
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struct rtc_timer aie_timer;
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struct rtc_timer uie_rtctimer;
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struct hrtimer pie_timer; /* sub second exp, so needs hrtimer */
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int pie_enabled;
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struct work_struct irqwork;
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/* Some hardware can't support UIE mode */
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int uie_unsupported;
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bool registered;
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struct nvmem_config *nvmem_config;
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struct nvmem_device *nvmem;
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/* Old ABI support */
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bool nvram_old_abi;
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struct bin_attribute *nvram;
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#ifdef CONFIG_RTC_INTF_DEV_UIE_EMUL
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struct work_struct uie_task;
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struct timer_list uie_timer;
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/* Those fields are protected by rtc->irq_lock */
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unsigned int oldsecs;
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unsigned int uie_irq_active:1;
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unsigned int stop_uie_polling:1;
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unsigned int uie_task_active:1;
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unsigned int uie_timer_active:1;
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#endif
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};
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#define to_rtc_device(d) container_of(d, struct rtc_device, dev)
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extern struct rtc_device *rtc_device_register(const char *name,
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struct device *dev,
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const struct rtc_class_ops *ops,
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struct module *owner);
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extern struct rtc_device *devm_rtc_device_register(struct device *dev,
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const char *name,
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const struct rtc_class_ops *ops,
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struct module *owner);
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struct rtc_device *devm_rtc_allocate_device(struct device *dev);
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int __rtc_register_device(struct module *owner, struct rtc_device *rtc);
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extern void rtc_device_unregister(struct rtc_device *rtc);
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extern void devm_rtc_device_unregister(struct device *dev,
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struct rtc_device *rtc);
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extern int rtc_read_time(struct rtc_device *rtc, struct rtc_time *tm);
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extern int rtc_set_time(struct rtc_device *rtc, struct rtc_time *tm);
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extern int rtc_set_ntp_time(struct timespec64 now);
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int __rtc_read_alarm(struct rtc_device *rtc, struct rtc_wkalrm *alarm);
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extern int rtc_read_alarm(struct rtc_device *rtc,
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struct rtc_wkalrm *alrm);
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extern int rtc_set_alarm(struct rtc_device *rtc,
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struct rtc_wkalrm *alrm);
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extern int rtc_initialize_alarm(struct rtc_device *rtc,
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struct rtc_wkalrm *alrm);
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extern void rtc_update_irq(struct rtc_device *rtc,
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unsigned long num, unsigned long events);
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extern struct rtc_device *rtc_class_open(const char *name);
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extern void rtc_class_close(struct rtc_device *rtc);
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extern int rtc_irq_register(struct rtc_device *rtc,
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struct rtc_task *task);
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extern void rtc_irq_unregister(struct rtc_device *rtc,
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struct rtc_task *task);
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extern int rtc_irq_set_state(struct rtc_device *rtc,
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struct rtc_task *task, int enabled);
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extern int rtc_irq_set_freq(struct rtc_device *rtc,
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struct rtc_task *task, int freq);
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extern int rtc_update_irq_enable(struct rtc_device *rtc, unsigned int enabled);
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extern int rtc_alarm_irq_enable(struct rtc_device *rtc, unsigned int enabled);
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extern int rtc_dev_update_irq_enable_emul(struct rtc_device *rtc,
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unsigned int enabled);
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void rtc_handle_legacy_irq(struct rtc_device *rtc, int num, int mode);
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void rtc_aie_update_irq(void *private);
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void rtc_uie_update_irq(void *private);
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enum hrtimer_restart rtc_pie_update_irq(struct hrtimer *timer);
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int rtc_register(rtc_task_t *task);
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int rtc_unregister(rtc_task_t *task);
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int rtc_control(rtc_task_t *t, unsigned int cmd, unsigned long arg);
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void rtc_timer_init(struct rtc_timer *timer, void (*f)(void *p), void *data);
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int rtc_timer_start(struct rtc_device *rtc, struct rtc_timer *timer,
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ktime_t expires, ktime_t period);
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void rtc_timer_cancel(struct rtc_device *rtc, struct rtc_timer *timer);
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int rtc_read_offset(struct rtc_device *rtc, long *offset);
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int rtc_set_offset(struct rtc_device *rtc, long offset);
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void rtc_timer_do_work(struct work_struct *work);
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static inline bool is_leap_year(unsigned int year)
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{
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return (!(year % 4) && (year % 100)) || !(year % 400);
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}
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#define rtc_register_device(device) \
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__rtc_register_device(THIS_MODULE, device)
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#ifdef CONFIG_RTC_HCTOSYS_DEVICE
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extern int rtc_hctosys_ret;
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#else
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#define rtc_hctosys_ret -ENODEV
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#endif
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#endif /* _LINUX_RTC_H_ */
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