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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>
184 lines
4.3 KiB
C
184 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* event.c - exporting ACPI events via procfs
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*
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* Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
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* Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
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*
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*/
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#include <linux/spinlock.h>
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#include <linux/export.h>
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#include <linux/proc_fs.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/gfp.h>
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#include <linux/acpi.h>
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#include <net/netlink.h>
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#include <net/genetlink.h>
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#include "internal.h"
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#define _COMPONENT ACPI_SYSTEM_COMPONENT
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ACPI_MODULE_NAME("event");
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/* ACPI notifier chain */
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static BLOCKING_NOTIFIER_HEAD(acpi_chain_head);
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int acpi_notifier_call_chain(struct acpi_device *dev, u32 type, u32 data)
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{
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struct acpi_bus_event event;
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strcpy(event.device_class, dev->pnp.device_class);
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strcpy(event.bus_id, dev->pnp.bus_id);
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event.type = type;
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event.data = data;
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return (blocking_notifier_call_chain(&acpi_chain_head, 0, (void *)&event)
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== NOTIFY_BAD) ? -EINVAL : 0;
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}
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EXPORT_SYMBOL(acpi_notifier_call_chain);
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int register_acpi_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_register(&acpi_chain_head, nb);
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}
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EXPORT_SYMBOL(register_acpi_notifier);
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int unregister_acpi_notifier(struct notifier_block *nb)
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{
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return blocking_notifier_chain_unregister(&acpi_chain_head, nb);
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}
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EXPORT_SYMBOL(unregister_acpi_notifier);
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#ifdef CONFIG_NET
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static unsigned int acpi_event_seqnum;
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struct acpi_genl_event {
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acpi_device_class device_class;
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char bus_id[15];
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u32 type;
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u32 data;
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};
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/* attributes of acpi_genl_family */
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enum {
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ACPI_GENL_ATTR_UNSPEC,
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ACPI_GENL_ATTR_EVENT, /* ACPI event info needed by user space */
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__ACPI_GENL_ATTR_MAX,
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};
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#define ACPI_GENL_ATTR_MAX (__ACPI_GENL_ATTR_MAX - 1)
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/* commands supported by the acpi_genl_family */
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enum {
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ACPI_GENL_CMD_UNSPEC,
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ACPI_GENL_CMD_EVENT, /* kernel->user notifications for ACPI events */
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__ACPI_GENL_CMD_MAX,
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};
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#define ACPI_GENL_CMD_MAX (__ACPI_GENL_CMD_MAX - 1)
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#define ACPI_GENL_FAMILY_NAME "acpi_event"
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#define ACPI_GENL_VERSION 0x01
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#define ACPI_GENL_MCAST_GROUP_NAME "acpi_mc_group"
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static const struct genl_multicast_group acpi_event_mcgrps[] = {
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{ .name = ACPI_GENL_MCAST_GROUP_NAME, },
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};
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static struct genl_family acpi_event_genl_family __ro_after_init = {
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.module = THIS_MODULE,
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.name = ACPI_GENL_FAMILY_NAME,
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.version = ACPI_GENL_VERSION,
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.maxattr = ACPI_GENL_ATTR_MAX,
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.mcgrps = acpi_event_mcgrps,
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.n_mcgrps = ARRAY_SIZE(acpi_event_mcgrps),
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};
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int acpi_bus_generate_netlink_event(const char *device_class,
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const char *bus_id,
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u8 type, int data)
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{
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struct sk_buff *skb;
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struct nlattr *attr;
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struct acpi_genl_event *event;
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void *msg_header;
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int size;
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/* allocate memory */
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size = nla_total_size(sizeof(struct acpi_genl_event)) +
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nla_total_size(0);
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skb = genlmsg_new(size, GFP_ATOMIC);
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if (!skb)
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return -ENOMEM;
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/* add the genetlink message header */
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msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,
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&acpi_event_genl_family, 0,
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ACPI_GENL_CMD_EVENT);
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if (!msg_header) {
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nlmsg_free(skb);
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return -ENOMEM;
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}
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/* fill the data */
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attr =
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nla_reserve(skb, ACPI_GENL_ATTR_EVENT,
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sizeof(struct acpi_genl_event));
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if (!attr) {
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nlmsg_free(skb);
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return -EINVAL;
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}
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event = nla_data(attr);
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memset(event, 0, sizeof(struct acpi_genl_event));
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strcpy(event->device_class, device_class);
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strcpy(event->bus_id, bus_id);
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event->type = type;
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event->data = data;
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/* send multicast genetlink message */
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genlmsg_end(skb, msg_header);
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genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);
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return 0;
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}
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EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
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static int __init acpi_event_genetlink_init(void)
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{
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return genl_register_family(&acpi_event_genl_family);
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}
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#else
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int acpi_bus_generate_netlink_event(const char *device_class,
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const char *bus_id,
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u8 type, int data)
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{
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return 0;
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}
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EXPORT_SYMBOL(acpi_bus_generate_netlink_event);
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static int acpi_event_genetlink_init(void)
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{
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return -ENODEV;
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}
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#endif
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static int __init acpi_event_init(void)
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{
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int error = 0;
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if (acpi_disabled)
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return 0;
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/* create genetlink for acpi event */
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error = acpi_event_genetlink_init();
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if (error)
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printk(KERN_WARNING PREFIX
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"Failed to create genetlink family for ACPI event\n");
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return 0;
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}
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fs_initcall(acpi_event_init);
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