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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>
205 lines
5.5 KiB
C
205 lines
5.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BLK_STAT_H
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#define BLK_STAT_H
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#include <linux/kernel.h>
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#include <linux/blkdev.h>
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#include <linux/ktime.h>
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#include <linux/rcupdate.h>
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#include <linux/timer.h>
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/*
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* from upper:
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* 3 bits: reserved for other usage
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* 12 bits: size
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* 49 bits: time
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*/
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#define BLK_STAT_RES_BITS 3
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#define BLK_STAT_SIZE_BITS 12
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#define BLK_STAT_RES_SHIFT (64 - BLK_STAT_RES_BITS)
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#define BLK_STAT_SIZE_SHIFT (BLK_STAT_RES_SHIFT - BLK_STAT_SIZE_BITS)
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#define BLK_STAT_TIME_MASK ((1ULL << BLK_STAT_SIZE_SHIFT) - 1)
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#define BLK_STAT_SIZE_MASK \
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(((1ULL << BLK_STAT_SIZE_BITS) - 1) << BLK_STAT_SIZE_SHIFT)
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#define BLK_STAT_RES_MASK (~((1ULL << BLK_STAT_RES_SHIFT) - 1))
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/**
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* struct blk_stat_callback - Block statistics callback.
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*
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* A &struct blk_stat_callback is associated with a &struct request_queue. While
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* @timer is active, that queue's request completion latencies are sorted into
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* buckets by @bucket_fn and added to a per-cpu buffer, @cpu_stat. When the
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* timer fires, @cpu_stat is flushed to @stat and @timer_fn is invoked.
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*/
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struct blk_stat_callback {
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/*
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* @list: RCU list of callbacks for a &struct request_queue.
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*/
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struct list_head list;
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/**
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* @timer: Timer for the next callback invocation.
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*/
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struct timer_list timer;
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/**
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* @cpu_stat: Per-cpu statistics buckets.
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*/
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struct blk_rq_stat __percpu *cpu_stat;
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/**
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* @bucket_fn: Given a request, returns which statistics bucket it
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* should be accounted under. Return -1 for no bucket for this
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* request.
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*/
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int (*bucket_fn)(const struct request *);
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/**
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* @buckets: Number of statistics buckets.
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*/
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unsigned int buckets;
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/**
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* @stat: Array of statistics buckets.
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*/
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struct blk_rq_stat *stat;
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/**
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* @fn: Callback function.
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*/
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void (*timer_fn)(struct blk_stat_callback *);
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/**
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* @data: Private pointer for the user.
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*/
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void *data;
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struct rcu_head rcu;
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};
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struct blk_queue_stats *blk_alloc_queue_stats(void);
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void blk_free_queue_stats(struct blk_queue_stats *);
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void blk_stat_add(struct request *);
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static inline u64 __blk_stat_time(u64 time)
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{
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return time & BLK_STAT_TIME_MASK;
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}
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static inline u64 blk_stat_time(struct blk_issue_stat *stat)
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{
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return __blk_stat_time(stat->stat);
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}
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static inline sector_t blk_capped_size(sector_t size)
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{
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return size & ((1ULL << BLK_STAT_SIZE_BITS) - 1);
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}
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static inline sector_t blk_stat_size(struct blk_issue_stat *stat)
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{
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return (stat->stat & BLK_STAT_SIZE_MASK) >> BLK_STAT_SIZE_SHIFT;
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}
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static inline void blk_stat_set_issue(struct blk_issue_stat *stat,
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sector_t size)
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{
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stat->stat = (stat->stat & BLK_STAT_RES_MASK) |
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(ktime_to_ns(ktime_get()) & BLK_STAT_TIME_MASK) |
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(((u64)blk_capped_size(size)) << BLK_STAT_SIZE_SHIFT);
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}
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/* record time/size info in request but not add a callback */
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void blk_stat_enable_accounting(struct request_queue *q);
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/**
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* blk_stat_alloc_callback() - Allocate a block statistics callback.
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* @timer_fn: Timer callback function.
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* @bucket_fn: Bucket callback function.
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* @buckets: Number of statistics buckets.
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* @data: Value for the @data field of the &struct blk_stat_callback.
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*
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* See &struct blk_stat_callback for details on the callback functions.
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*
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* Return: &struct blk_stat_callback on success or NULL on ENOMEM.
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*/
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struct blk_stat_callback *
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blk_stat_alloc_callback(void (*timer_fn)(struct blk_stat_callback *),
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int (*bucket_fn)(const struct request *),
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unsigned int buckets, void *data);
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/**
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* blk_stat_add_callback() - Add a block statistics callback to be run on a
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* request queue.
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* @q: The request queue.
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* @cb: The callback.
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*
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* Note that a single &struct blk_stat_callback can only be added to a single
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* &struct request_queue.
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*/
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void blk_stat_add_callback(struct request_queue *q,
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struct blk_stat_callback *cb);
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/**
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* blk_stat_remove_callback() - Remove a block statistics callback from a
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* request queue.
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* @q: The request queue.
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* @cb: The callback.
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*
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* When this returns, the callback is not running on any CPUs and will not be
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* called again unless readded.
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*/
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void blk_stat_remove_callback(struct request_queue *q,
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struct blk_stat_callback *cb);
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/**
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* blk_stat_free_callback() - Free a block statistics callback.
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* @cb: The callback.
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*
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* @cb may be NULL, in which case this does nothing. If it is not NULL, @cb must
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* not be associated with a request queue. I.e., if it was previously added with
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* blk_stat_add_callback(), it must also have been removed since then with
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* blk_stat_remove_callback().
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*/
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void blk_stat_free_callback(struct blk_stat_callback *cb);
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/**
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* blk_stat_is_active() - Check if a block statistics callback is currently
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* gathering statistics.
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* @cb: The callback.
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*/
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static inline bool blk_stat_is_active(struct blk_stat_callback *cb)
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{
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return timer_pending(&cb->timer);
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}
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/**
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* blk_stat_activate_nsecs() - Gather block statistics during a time window in
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* nanoseconds.
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* @cb: The callback.
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* @nsecs: Number of nanoseconds to gather statistics for.
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*
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* The timer callback will be called when the window expires.
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*/
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static inline void blk_stat_activate_nsecs(struct blk_stat_callback *cb,
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u64 nsecs)
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{
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mod_timer(&cb->timer, jiffies + nsecs_to_jiffies(nsecs));
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}
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/**
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* blk_stat_activate_msecs() - Gather block statistics during a time window in
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* milliseconds.
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* @cb: The callback.
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* @msecs: Number of milliseconds to gather statistics for.
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*
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* The timer callback will be called when the window expires.
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*/
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static inline void blk_stat_activate_msecs(struct blk_stat_callback *cb,
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unsigned int msecs)
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{
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mod_timer(&cb->timer, jiffies + msecs_to_jiffies(msecs));
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}
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#endif
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