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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>
244 lines
6.8 KiB
C
244 lines
6.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTREE_H
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#define BTREE_H
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#include <linux/kernel.h>
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#include <linux/mempool.h>
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/**
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* DOC: B+Tree basics
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*
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* A B+Tree is a data structure for looking up arbitrary (currently allowing
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* unsigned long, u32, u64 and 2 * u64) keys into pointers. The data structure
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* is described at http://en.wikipedia.org/wiki/B-tree, we currently do not
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* use binary search to find the key on lookups.
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*
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* Each B+Tree consists of a head, that contains bookkeeping information and
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* a variable number (starting with zero) nodes. Each node contains the keys
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* and pointers to sub-nodes, or, for leaf nodes, the keys and values for the
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* tree entries.
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*
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* Each node in this implementation has the following layout:
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* [key1, key2, ..., keyN] [val1, val2, ..., valN]
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*
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* Each key here is an array of unsigned longs, geo->no_longs in total. The
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* number of keys and values (N) is geo->no_pairs.
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*/
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/**
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* struct btree_head - btree head
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*
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* @node: the first node in the tree
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* @mempool: mempool used for node allocations
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* @height: current of the tree
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*/
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struct btree_head {
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unsigned long *node;
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mempool_t *mempool;
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int height;
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};
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/* btree geometry */
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struct btree_geo;
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/**
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* btree_alloc - allocate function for the mempool
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* @gfp_mask: gfp mask for the allocation
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* @pool_data: unused
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*/
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void *btree_alloc(gfp_t gfp_mask, void *pool_data);
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/**
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* btree_free - free function for the mempool
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* @element: the element to free
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* @pool_data: unused
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*/
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void btree_free(void *element, void *pool_data);
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/**
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* btree_init_mempool - initialise a btree with given mempool
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*
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* @head: the btree head to initialise
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* @mempool: the mempool to use
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*
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* When this function is used, there is no need to destroy
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* the mempool.
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*/
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void btree_init_mempool(struct btree_head *head, mempool_t *mempool);
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/**
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* btree_init - initialise a btree
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*
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* @head: the btree head to initialise
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*
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* This function allocates the memory pool that the
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* btree needs. Returns zero or a negative error code
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* (-%ENOMEM) when memory allocation fails.
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*
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*/
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int __must_check btree_init(struct btree_head *head);
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/**
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* btree_destroy - destroy mempool
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*
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* @head: the btree head to destroy
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*
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* This function destroys the internal memory pool, use only
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* when using btree_init(), not with btree_init_mempool().
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*/
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void btree_destroy(struct btree_head *head);
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/**
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* btree_lookup - look up a key in the btree
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*
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* @head: the btree to look in
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* @geo: the btree geometry
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* @key: the key to look up
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*
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* This function returns the value for the given key, or %NULL.
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*/
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void *btree_lookup(struct btree_head *head, struct btree_geo *geo,
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unsigned long *key);
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/**
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* btree_insert - insert an entry into the btree
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*
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* @head: the btree to add to
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* @geo: the btree geometry
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* @key: the key to add (must not already be present)
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* @val: the value to add (must not be %NULL)
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* @gfp: allocation flags for node allocations
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*
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* This function returns 0 if the item could be added, or an
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* error code if it failed (may fail due to memory pressure).
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*/
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int __must_check btree_insert(struct btree_head *head, struct btree_geo *geo,
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unsigned long *key, void *val, gfp_t gfp);
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/**
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* btree_update - update an entry in the btree
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*
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* @head: the btree to update
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* @geo: the btree geometry
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* @key: the key to update
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* @val: the value to change it to (must not be %NULL)
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*
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* This function returns 0 if the update was successful, or
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* -%ENOENT if the key could not be found.
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*/
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int btree_update(struct btree_head *head, struct btree_geo *geo,
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unsigned long *key, void *val);
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/**
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* btree_remove - remove an entry from the btree
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*
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* @head: the btree to update
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* @geo: the btree geometry
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* @key: the key to remove
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*
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* This function returns the removed entry, or %NULL if the key
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* could not be found.
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*/
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void *btree_remove(struct btree_head *head, struct btree_geo *geo,
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unsigned long *key);
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/**
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* btree_merge - merge two btrees
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*
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* @target: the tree that gets all the entries
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* @victim: the tree that gets merged into @target
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* @geo: the btree geometry
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* @gfp: allocation flags
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*
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* The two trees @target and @victim may not contain the same keys,
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* that is a bug and triggers a BUG(). This function returns zero
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* if the trees were merged successfully, and may return a failure
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* when memory allocation fails, in which case both trees might have
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* been partially merged, i.e. some entries have been moved from
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* @victim to @target.
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*/
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int btree_merge(struct btree_head *target, struct btree_head *victim,
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struct btree_geo *geo, gfp_t gfp);
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/**
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* btree_last - get last entry in btree
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*
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* @head: btree head
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* @geo: btree geometry
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* @key: last key
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*
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* Returns the last entry in the btree, and sets @key to the key
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* of that entry; returns NULL if the tree is empty, in that case
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* key is not changed.
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*/
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void *btree_last(struct btree_head *head, struct btree_geo *geo,
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unsigned long *key);
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/**
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* btree_get_prev - get previous entry
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*
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* @head: btree head
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* @geo: btree geometry
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* @key: pointer to key
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*
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* The function returns the next item right before the value pointed to by
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* @key, and updates @key with its key, or returns %NULL when there is no
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* entry with a key smaller than the given key.
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*/
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void *btree_get_prev(struct btree_head *head, struct btree_geo *geo,
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unsigned long *key);
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/* internal use, use btree_visitor{l,32,64,128} */
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size_t btree_visitor(struct btree_head *head, struct btree_geo *geo,
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unsigned long opaque,
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void (*func)(void *elem, unsigned long opaque,
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unsigned long *key, size_t index,
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void *func2),
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void *func2);
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/* internal use, use btree_grim_visitor{l,32,64,128} */
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size_t btree_grim_visitor(struct btree_head *head, struct btree_geo *geo,
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unsigned long opaque,
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void (*func)(void *elem, unsigned long opaque,
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unsigned long *key,
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size_t index, void *func2),
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void *func2);
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#include <linux/btree-128.h>
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extern struct btree_geo btree_geo32;
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#define BTREE_TYPE_SUFFIX l
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#define BTREE_TYPE_BITS BITS_PER_LONG
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#define BTREE_TYPE_GEO &btree_geo32
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#define BTREE_KEYTYPE unsigned long
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#include <linux/btree-type.h>
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#define btree_for_each_safel(head, key, val) \
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for (val = btree_lastl(head, &key); \
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val; \
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val = btree_get_prevl(head, &key))
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#define BTREE_TYPE_SUFFIX 32
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#define BTREE_TYPE_BITS 32
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#define BTREE_TYPE_GEO &btree_geo32
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#define BTREE_KEYTYPE u32
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#include <linux/btree-type.h>
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#define btree_for_each_safe32(head, key, val) \
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for (val = btree_last32(head, &key); \
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val; \
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val = btree_get_prev32(head, &key))
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extern struct btree_geo btree_geo64;
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#define BTREE_TYPE_SUFFIX 64
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#define BTREE_TYPE_BITS 64
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#define BTREE_TYPE_GEO &btree_geo64
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#define BTREE_KEYTYPE u64
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#include <linux/btree-type.h>
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#define btree_for_each_safe64(head, key, val) \
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for (val = btree_last64(head, &key); \
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val; \
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val = btree_get_prev64(head, &key))
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#endif
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