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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>
186 lines
5.1 KiB
C
186 lines
5.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _DYNAMIC_DEBUG_H
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#define _DYNAMIC_DEBUG_H
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#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
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#include <linux/jump_label.h>
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#endif
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/*
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* An instance of this structure is created in a special
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* ELF section at every dynamic debug callsite. At runtime,
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* the special section is treated as an array of these.
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*/
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struct _ddebug {
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/*
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* These fields are used to drive the user interface
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* for selecting and displaying debug callsites.
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*/
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const char *modname;
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const char *function;
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const char *filename;
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const char *format;
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unsigned int lineno:18;
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/*
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* The flags field controls the behaviour at the callsite.
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* The bits here are changed dynamically when the user
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* writes commands to <debugfs>/dynamic_debug/control
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*/
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#define _DPRINTK_FLAGS_NONE 0
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#define _DPRINTK_FLAGS_PRINT (1<<0) /* printk() a message using the format */
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#define _DPRINTK_FLAGS_INCL_MODNAME (1<<1)
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#define _DPRINTK_FLAGS_INCL_FUNCNAME (1<<2)
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#define _DPRINTK_FLAGS_INCL_LINENO (1<<3)
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#define _DPRINTK_FLAGS_INCL_TID (1<<4)
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#if defined DEBUG
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#define _DPRINTK_FLAGS_DEFAULT _DPRINTK_FLAGS_PRINT
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#else
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#define _DPRINTK_FLAGS_DEFAULT 0
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#endif
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unsigned int flags:8;
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#ifdef HAVE_JUMP_LABEL
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union {
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struct static_key_true dd_key_true;
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struct static_key_false dd_key_false;
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} key;
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#endif
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} __attribute__((aligned(8)));
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int ddebug_add_module(struct _ddebug *tab, unsigned int n,
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const char *modname);
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#if defined(CONFIG_DYNAMIC_DEBUG)
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extern int ddebug_remove_module(const char *mod_name);
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extern __printf(2, 3)
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void __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...);
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extern int ddebug_dyndbg_module_param_cb(char *param, char *val,
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const char *modname);
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struct device;
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extern __printf(3, 4)
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void __dynamic_dev_dbg(struct _ddebug *descriptor, const struct device *dev,
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const char *fmt, ...);
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struct net_device;
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extern __printf(3, 4)
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void __dynamic_netdev_dbg(struct _ddebug *descriptor,
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const struct net_device *dev,
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const char *fmt, ...);
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#define DEFINE_DYNAMIC_DEBUG_METADATA_KEY(name, fmt, key, init) \
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static struct _ddebug __aligned(8) \
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__attribute__((section("__verbose"))) name = { \
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.modname = KBUILD_MODNAME, \
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.function = __func__, \
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.filename = __FILE__, \
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.format = (fmt), \
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.lineno = __LINE__, \
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.flags = _DPRINTK_FLAGS_DEFAULT, \
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dd_key_init(key, init) \
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}
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#ifdef HAVE_JUMP_LABEL
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#define dd_key_init(key, init) key = (init)
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#ifdef DEBUG
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#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \
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DEFINE_DYNAMIC_DEBUG_METADATA_KEY(name, fmt, .key.dd_key_true, \
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(STATIC_KEY_TRUE_INIT))
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#define DYNAMIC_DEBUG_BRANCH(descriptor) \
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static_branch_likely(&descriptor.key.dd_key_true)
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#else
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#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \
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DEFINE_DYNAMIC_DEBUG_METADATA_KEY(name, fmt, .key.dd_key_false, \
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(STATIC_KEY_FALSE_INIT))
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#define DYNAMIC_DEBUG_BRANCH(descriptor) \
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static_branch_unlikely(&descriptor.key.dd_key_false)
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#endif
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#else
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#define dd_key_init(key, init)
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#define DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt) \
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DEFINE_DYNAMIC_DEBUG_METADATA_KEY(name, fmt, 0, 0)
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#ifdef DEBUG
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#define DYNAMIC_DEBUG_BRANCH(descriptor) \
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likely(descriptor.flags & _DPRINTK_FLAGS_PRINT)
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#else
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#define DYNAMIC_DEBUG_BRANCH(descriptor) \
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unlikely(descriptor.flags & _DPRINTK_FLAGS_PRINT)
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#endif
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#endif
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#define dynamic_pr_debug(fmt, ...) \
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do { \
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
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if (DYNAMIC_DEBUG_BRANCH(descriptor)) \
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__dynamic_pr_debug(&descriptor, pr_fmt(fmt), \
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##__VA_ARGS__); \
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} while (0)
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#define dynamic_dev_dbg(dev, fmt, ...) \
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do { \
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
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if (DYNAMIC_DEBUG_BRANCH(descriptor)) \
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__dynamic_dev_dbg(&descriptor, dev, fmt, \
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##__VA_ARGS__); \
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} while (0)
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#define dynamic_netdev_dbg(dev, fmt, ...) \
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do { \
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \
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if (DYNAMIC_DEBUG_BRANCH(descriptor)) \
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__dynamic_netdev_dbg(&descriptor, dev, fmt, \
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##__VA_ARGS__); \
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} while (0)
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#define dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
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groupsize, buf, len, ascii) \
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do { \
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DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, \
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__builtin_constant_p(prefix_str) ? prefix_str : "hexdump");\
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if (DYNAMIC_DEBUG_BRANCH(descriptor)) \
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print_hex_dump(KERN_DEBUG, prefix_str, \
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prefix_type, rowsize, groupsize, \
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buf, len, ascii); \
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} while (0)
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#else
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#include <linux/string.h>
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#include <linux/errno.h>
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static inline int ddebug_remove_module(const char *mod)
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{
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return 0;
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}
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static inline int ddebug_dyndbg_module_param_cb(char *param, char *val,
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const char *modname)
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{
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if (strstr(param, "dyndbg")) {
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/* avoid pr_warn(), which wants pr_fmt() fully defined */
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printk(KERN_WARNING "dyndbg param is supported only in "
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"CONFIG_DYNAMIC_DEBUG builds\n");
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return 0; /* allow and ignore */
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}
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return -EINVAL;
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}
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#define dynamic_pr_debug(fmt, ...) \
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do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0)
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#define dynamic_dev_dbg(dev, fmt, ...) \
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do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0)
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#endif
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#endif
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