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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>
199 lines
5.4 KiB
C
199 lines
5.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_CHECKSUM_64_H
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#define _ASM_X86_CHECKSUM_64_H
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/*
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* Checksums for x86-64
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* Copyright 2002 by Andi Kleen, SuSE Labs
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* with some code from asm-x86/checksum.h
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*/
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#include <linux/compiler.h>
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#include <linux/uaccess.h>
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#include <asm/byteorder.h>
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/**
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* csum_fold - Fold and invert a 32bit checksum.
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* sum: 32bit unfolded sum
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*
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* Fold a 32bit running checksum to 16bit and invert it. This is usually
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* the last step before putting a checksum into a packet.
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* Make sure not to mix with 64bit checksums.
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*/
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static inline __sum16 csum_fold(__wsum sum)
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{
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asm(" addl %1,%0\n"
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" adcl $0xffff,%0"
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: "=r" (sum)
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: "r" ((__force u32)sum << 16),
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"0" ((__force u32)sum & 0xffff0000));
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return (__force __sum16)(~(__force u32)sum >> 16);
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}
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/*
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* This is a version of ip_compute_csum() optimized for IP headers,
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* which always checksum on 4 octet boundaries.
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*
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* By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
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* Arnt Gulbrandsen.
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*/
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/**
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* ip_fast_csum - Compute the IPv4 header checksum efficiently.
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* iph: ipv4 header
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* ihl: length of header / 4
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*/
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static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl)
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{
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unsigned int sum;
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asm(" movl (%1), %0\n"
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" subl $4, %2\n"
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" jbe 2f\n"
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" addl 4(%1), %0\n"
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" adcl 8(%1), %0\n"
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" adcl 12(%1), %0\n"
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"1: adcl 16(%1), %0\n"
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" lea 4(%1), %1\n"
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" decl %2\n"
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" jne 1b\n"
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" adcl $0, %0\n"
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" movl %0, %2\n"
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" shrl $16, %0\n"
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" addw %w2, %w0\n"
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" adcl $0, %0\n"
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" notl %0\n"
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"2:"
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/* Since the input registers which are loaded with iph and ihl
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are modified, we must also specify them as outputs, or gcc
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will assume they contain their original values. */
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: "=r" (sum), "=r" (iph), "=r" (ihl)
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: "1" (iph), "2" (ihl)
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: "memory");
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return (__force __sum16)sum;
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}
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/**
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* csum_tcpup_nofold - Compute an IPv4 pseudo header checksum.
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* @saddr: source address
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* @daddr: destination address
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* @len: length of packet
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* @proto: ip protocol of packet
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* @sum: initial sum to be added in (32bit unfolded)
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*
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* Returns the pseudo header checksum the input data. Result is
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* 32bit unfolded.
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*/
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static inline __wsum
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csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len,
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__u8 proto, __wsum sum)
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{
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asm(" addl %1, %0\n"
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" adcl %2, %0\n"
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" adcl %3, %0\n"
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" adcl $0, %0\n"
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: "=r" (sum)
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: "g" (daddr), "g" (saddr),
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"g" ((len + proto)<<8), "0" (sum));
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return sum;
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}
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/**
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* csum_tcpup_magic - Compute an IPv4 pseudo header checksum.
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* @saddr: source address
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* @daddr: destination address
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* @len: length of packet
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* @proto: ip protocol of packet
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* @sum: initial sum to be added in (32bit unfolded)
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*
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* Returns the 16bit pseudo header checksum the input data already
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* complemented and ready to be filled in.
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*/
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static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr,
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__u32 len, __u8 proto,
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__wsum sum)
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{
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return csum_fold(csum_tcpudp_nofold(saddr, daddr, len, proto, sum));
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}
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/**
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* csum_partial - Compute an internet checksum.
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* @buff: buffer to be checksummed
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* @len: length of buffer.
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* @sum: initial sum to be added in (32bit unfolded)
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*
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* Returns the 32bit unfolded internet checksum of the buffer.
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* Before filling it in it needs to be csum_fold()'ed.
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* buff should be aligned to a 64bit boundary if possible.
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*/
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extern __wsum csum_partial(const void *buff, int len, __wsum sum);
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#define _HAVE_ARCH_COPY_AND_CSUM_FROM_USER 1
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#define HAVE_CSUM_COPY_USER 1
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/* Do not call this directly. Use the wrappers below */
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extern __visible __wsum csum_partial_copy_generic(const void *src, const void *dst,
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int len, __wsum sum,
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int *src_err_ptr, int *dst_err_ptr);
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extern __wsum csum_partial_copy_from_user(const void __user *src, void *dst,
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int len, __wsum isum, int *errp);
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extern __wsum csum_partial_copy_to_user(const void *src, void __user *dst,
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int len, __wsum isum, int *errp);
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extern __wsum csum_partial_copy_nocheck(const void *src, void *dst,
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int len, __wsum sum);
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/* Old names. To be removed. */
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#define csum_and_copy_to_user csum_partial_copy_to_user
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#define csum_and_copy_from_user csum_partial_copy_from_user
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/**
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* ip_compute_csum - Compute an 16bit IP checksum.
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* @buff: buffer address.
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* @len: length of buffer.
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*
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* Returns the 16bit folded/inverted checksum of the passed buffer.
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* Ready to fill in.
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*/
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extern __sum16 ip_compute_csum(const void *buff, int len);
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/**
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* csum_ipv6_magic - Compute checksum of an IPv6 pseudo header.
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* @saddr: source address
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* @daddr: destination address
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* @len: length of packet
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* @proto: protocol of packet
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* @sum: initial sum (32bit unfolded) to be added in
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*
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* Computes an IPv6 pseudo header checksum. This sum is added the checksum
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* into UDP/TCP packets and contains some link layer information.
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* Returns the unfolded 32bit checksum.
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*/
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struct in6_addr;
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#define _HAVE_ARCH_IPV6_CSUM 1
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extern __sum16
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csum_ipv6_magic(const struct in6_addr *saddr, const struct in6_addr *daddr,
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__u32 len, __u8 proto, __wsum sum);
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static inline unsigned add32_with_carry(unsigned a, unsigned b)
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{
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asm("addl %2,%0\n\t"
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"adcl $0,%0"
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: "=r" (a)
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: "0" (a), "rm" (b));
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return a;
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}
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#define HAVE_ARCH_CSUM_ADD
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static inline __wsum csum_add(__wsum csum, __wsum addend)
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{
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return (__force __wsum)add32_with_carry((__force unsigned)csum,
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(__force unsigned)addend);
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}
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#endif /* _ASM_X86_CHECKSUM_64_H */
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