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b24413180f
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>
297 lines
8.4 KiB
C
297 lines
8.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Tick related global functions
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*/
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#ifndef _LINUX_TICK_H
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#define _LINUX_TICK_H
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#include <linux/clockchips.h>
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#include <linux/irqflags.h>
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#include <linux/percpu.h>
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#include <linux/context_tracking_state.h>
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#include <linux/cpumask.h>
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#include <linux/sched.h>
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#ifdef CONFIG_GENERIC_CLOCKEVENTS
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extern void __init tick_init(void);
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/* Should be core only, but ARM BL switcher requires it */
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extern void tick_suspend_local(void);
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/* Should be core only, but XEN resume magic and ARM BL switcher require it */
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extern void tick_resume_local(void);
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extern void tick_handover_do_timer(void);
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extern void tick_cleanup_dead_cpu(int cpu);
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#else /* CONFIG_GENERIC_CLOCKEVENTS */
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static inline void tick_init(void) { }
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static inline void tick_suspend_local(void) { }
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static inline void tick_resume_local(void) { }
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static inline void tick_handover_do_timer(void) { }
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static inline void tick_cleanup_dead_cpu(int cpu) { }
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#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
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#if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
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extern void tick_freeze(void);
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extern void tick_unfreeze(void);
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#else
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static inline void tick_freeze(void) { }
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static inline void tick_unfreeze(void) { }
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#endif
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#ifdef CONFIG_TICK_ONESHOT
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extern void tick_irq_enter(void);
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# ifndef arch_needs_cpu
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# define arch_needs_cpu() (0)
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# endif
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# else
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static inline void tick_irq_enter(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 hotplug_cpu__broadcast_tick_pull(int dead_cpu);
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#else
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static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
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#endif
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enum tick_broadcast_mode {
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TICK_BROADCAST_OFF,
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TICK_BROADCAST_ON,
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TICK_BROADCAST_FORCE,
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};
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enum tick_broadcast_state {
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TICK_BROADCAST_EXIT,
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TICK_BROADCAST_ENTER,
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};
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#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
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extern void tick_broadcast_control(enum tick_broadcast_mode mode);
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#else
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static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
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#endif /* BROADCAST */
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#ifdef CONFIG_GENERIC_CLOCKEVENTS
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extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
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#else
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static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
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{
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return 0;
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}
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#endif
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static inline void tick_broadcast_enable(void)
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{
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tick_broadcast_control(TICK_BROADCAST_ON);
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}
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static inline void tick_broadcast_disable(void)
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{
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tick_broadcast_control(TICK_BROADCAST_OFF);
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}
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static inline void tick_broadcast_force(void)
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{
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tick_broadcast_control(TICK_BROADCAST_FORCE);
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}
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static inline int tick_broadcast_enter(void)
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{
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return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
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}
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static inline void tick_broadcast_exit(void)
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{
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tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
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}
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enum tick_dep_bits {
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TICK_DEP_BIT_POSIX_TIMER = 0,
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TICK_DEP_BIT_PERF_EVENTS = 1,
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TICK_DEP_BIT_SCHED = 2,
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TICK_DEP_BIT_CLOCK_UNSTABLE = 3
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};
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#define TICK_DEP_MASK_NONE 0
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#define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER)
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#define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS)
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#define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED)
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#define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE)
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#ifdef CONFIG_NO_HZ_COMMON
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extern bool tick_nohz_enabled;
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extern int tick_nohz_tick_stopped(void);
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extern void tick_nohz_idle_enter(void);
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extern void tick_nohz_idle_exit(void);
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extern void tick_nohz_irq_exit(void);
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extern ktime_t tick_nohz_get_sleep_length(void);
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extern unsigned long tick_nohz_get_idle_calls(void);
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extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
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extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
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#else /* !CONFIG_NO_HZ_COMMON */
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#define tick_nohz_enabled (0)
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static inline int tick_nohz_tick_stopped(void) { return 0; }
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static inline void tick_nohz_idle_enter(void) { }
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static inline void tick_nohz_idle_exit(void) { }
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static inline ktime_t tick_nohz_get_sleep_length(void)
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{
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return NSEC_PER_SEC / HZ;
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}
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static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
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static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
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#endif /* !CONFIG_NO_HZ_COMMON */
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#ifdef CONFIG_NO_HZ_FULL
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extern bool tick_nohz_full_running;
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extern cpumask_var_t tick_nohz_full_mask;
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extern cpumask_var_t housekeeping_mask;
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static inline bool tick_nohz_full_enabled(void)
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{
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if (!context_tracking_is_enabled())
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return false;
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return tick_nohz_full_running;
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}
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static inline bool tick_nohz_full_cpu(int cpu)
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{
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if (!tick_nohz_full_enabled())
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return false;
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return cpumask_test_cpu(cpu, tick_nohz_full_mask);
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}
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static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
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{
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if (tick_nohz_full_enabled())
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cpumask_or(mask, mask, tick_nohz_full_mask);
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}
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static inline int housekeeping_any_cpu(void)
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{
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return cpumask_any_and(housekeeping_mask, cpu_online_mask);
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}
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extern void tick_nohz_dep_set(enum tick_dep_bits bit);
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extern void tick_nohz_dep_clear(enum tick_dep_bits bit);
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extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit);
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extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit);
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extern void tick_nohz_dep_set_task(struct task_struct *tsk,
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enum tick_dep_bits bit);
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extern void tick_nohz_dep_clear_task(struct task_struct *tsk,
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enum tick_dep_bits bit);
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extern void tick_nohz_dep_set_signal(struct signal_struct *signal,
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enum tick_dep_bits bit);
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extern void tick_nohz_dep_clear_signal(struct signal_struct *signal,
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enum tick_dep_bits bit);
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/*
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* The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
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* on top of static keys.
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*/
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static inline void tick_dep_set(enum tick_dep_bits bit)
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{
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if (tick_nohz_full_enabled())
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tick_nohz_dep_set(bit);
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}
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static inline void tick_dep_clear(enum tick_dep_bits bit)
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{
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if (tick_nohz_full_enabled())
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tick_nohz_dep_clear(bit);
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}
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static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
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{
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if (tick_nohz_full_cpu(cpu))
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tick_nohz_dep_set_cpu(cpu, bit);
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}
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static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
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{
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if (tick_nohz_full_cpu(cpu))
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tick_nohz_dep_clear_cpu(cpu, bit);
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}
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static inline void tick_dep_set_task(struct task_struct *tsk,
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enum tick_dep_bits bit)
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{
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if (tick_nohz_full_enabled())
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tick_nohz_dep_set_task(tsk, bit);
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}
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static inline void tick_dep_clear_task(struct task_struct *tsk,
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enum tick_dep_bits bit)
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{
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if (tick_nohz_full_enabled())
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tick_nohz_dep_clear_task(tsk, bit);
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}
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static inline void tick_dep_set_signal(struct signal_struct *signal,
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enum tick_dep_bits bit)
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{
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if (tick_nohz_full_enabled())
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tick_nohz_dep_set_signal(signal, bit);
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}
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static inline void tick_dep_clear_signal(struct signal_struct *signal,
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enum tick_dep_bits bit)
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{
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if (tick_nohz_full_enabled())
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tick_nohz_dep_clear_signal(signal, bit);
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}
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extern void tick_nohz_full_kick_cpu(int cpu);
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extern void __tick_nohz_task_switch(void);
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#else
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static inline int housekeeping_any_cpu(void)
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{
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return smp_processor_id();
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}
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static inline bool tick_nohz_full_enabled(void) { return false; }
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static inline bool tick_nohz_full_cpu(int cpu) { return false; }
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static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
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static inline void tick_dep_set(enum tick_dep_bits bit) { }
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static inline void tick_dep_clear(enum tick_dep_bits bit) { }
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static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
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static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
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static inline void tick_dep_set_task(struct task_struct *tsk,
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enum tick_dep_bits bit) { }
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static inline void tick_dep_clear_task(struct task_struct *tsk,
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enum tick_dep_bits bit) { }
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static inline void tick_dep_set_signal(struct signal_struct *signal,
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enum tick_dep_bits bit) { }
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static inline void tick_dep_clear_signal(struct signal_struct *signal,
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enum tick_dep_bits bit) { }
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static inline void tick_nohz_full_kick_cpu(int cpu) { }
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static inline void __tick_nohz_task_switch(void) { }
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#endif
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static inline const struct cpumask *housekeeping_cpumask(void)
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{
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#ifdef CONFIG_NO_HZ_FULL
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if (tick_nohz_full_enabled())
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return housekeeping_mask;
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#endif
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return cpu_possible_mask;
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}
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static inline bool is_housekeeping_cpu(int cpu)
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{
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#ifdef CONFIG_NO_HZ_FULL
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if (tick_nohz_full_enabled())
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return cpumask_test_cpu(cpu, housekeeping_mask);
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#endif
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return true;
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}
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static inline void housekeeping_affine(struct task_struct *t)
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{
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#ifdef CONFIG_NO_HZ_FULL
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if (tick_nohz_full_enabled())
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set_cpus_allowed_ptr(t, housekeeping_mask);
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#endif
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}
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static inline void tick_nohz_task_switch(void)
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{
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if (tick_nohz_full_enabled())
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__tick_nohz_task_switch();
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}
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#endif
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