![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>
246 lines
5 KiB
C
246 lines
5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_SPECIAL_INSNS_H
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#define _ASM_X86_SPECIAL_INSNS_H
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#ifdef __KERNEL__
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#include <asm/nops.h>
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/*
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* Volatile isn't enough to prevent the compiler from reordering the
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* read/write functions for the control registers and messing everything up.
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* A memory clobber would solve the problem, but would prevent reordering of
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* all loads stores around it, which can hurt performance. Solution is to
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* use a variable and mimic reads and writes to it to enforce serialization
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*/
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extern unsigned long __force_order;
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static inline unsigned long native_read_cr0(void)
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{
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unsigned long val;
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asm volatile("mov %%cr0,%0\n\t" : "=r" (val), "=m" (__force_order));
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return val;
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}
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static inline void native_write_cr0(unsigned long val)
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{
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asm volatile("mov %0,%%cr0": : "r" (val), "m" (__force_order));
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}
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static inline unsigned long native_read_cr2(void)
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{
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unsigned long val;
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asm volatile("mov %%cr2,%0\n\t" : "=r" (val), "=m" (__force_order));
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return val;
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}
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static inline void native_write_cr2(unsigned long val)
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{
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asm volatile("mov %0,%%cr2": : "r" (val), "m" (__force_order));
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}
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static inline unsigned long __native_read_cr3(void)
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{
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unsigned long val;
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asm volatile("mov %%cr3,%0\n\t" : "=r" (val), "=m" (__force_order));
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return val;
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}
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static inline void native_write_cr3(unsigned long val)
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{
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asm volatile("mov %0,%%cr3": : "r" (val), "m" (__force_order));
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}
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static inline unsigned long native_read_cr4(void)
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{
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unsigned long val;
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#ifdef CONFIG_X86_32
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/*
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* This could fault if CR4 does not exist. Non-existent CR4
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* is functionally equivalent to CR4 == 0. Keep it simple and pretend
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* that CR4 == 0 on CPUs that don't have CR4.
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*/
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asm volatile("1: mov %%cr4, %0\n"
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"2:\n"
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_ASM_EXTABLE(1b, 2b)
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: "=r" (val), "=m" (__force_order) : "0" (0));
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#else
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/* CR4 always exists on x86_64. */
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asm volatile("mov %%cr4,%0\n\t" : "=r" (val), "=m" (__force_order));
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#endif
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return val;
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}
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static inline void native_write_cr4(unsigned long val)
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{
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asm volatile("mov %0,%%cr4": : "r" (val), "m" (__force_order));
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}
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#ifdef CONFIG_X86_64
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static inline unsigned long native_read_cr8(void)
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{
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unsigned long cr8;
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asm volatile("movq %%cr8,%0" : "=r" (cr8));
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return cr8;
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}
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static inline void native_write_cr8(unsigned long val)
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{
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asm volatile("movq %0,%%cr8" :: "r" (val) : "memory");
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}
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#endif
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#ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS
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static inline u32 __read_pkru(void)
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{
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u32 ecx = 0;
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u32 edx, pkru;
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/*
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* "rdpkru" instruction. Places PKRU contents in to EAX,
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* clears EDX and requires that ecx=0.
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*/
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asm volatile(".byte 0x0f,0x01,0xee\n\t"
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: "=a" (pkru), "=d" (edx)
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: "c" (ecx));
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return pkru;
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}
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static inline void __write_pkru(u32 pkru)
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{
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u32 ecx = 0, edx = 0;
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/*
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* "wrpkru" instruction. Loads contents in EAX to PKRU,
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* requires that ecx = edx = 0.
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*/
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asm volatile(".byte 0x0f,0x01,0xef\n\t"
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: : "a" (pkru), "c"(ecx), "d"(edx));
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}
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#else
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static inline u32 __read_pkru(void)
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{
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return 0;
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}
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static inline void __write_pkru(u32 pkru)
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{
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}
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#endif
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static inline void native_wbinvd(void)
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{
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asm volatile("wbinvd": : :"memory");
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}
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extern asmlinkage void native_load_gs_index(unsigned);
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static inline unsigned long __read_cr4(void)
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{
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return native_read_cr4();
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}
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#ifdef CONFIG_PARAVIRT
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#include <asm/paravirt.h>
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#else
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static inline unsigned long read_cr0(void)
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{
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return native_read_cr0();
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}
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static inline void write_cr0(unsigned long x)
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{
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native_write_cr0(x);
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}
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static inline unsigned long read_cr2(void)
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{
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return native_read_cr2();
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}
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static inline void write_cr2(unsigned long x)
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{
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native_write_cr2(x);
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}
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/*
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* Careful! CR3 contains more than just an address. You probably want
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* read_cr3_pa() instead.
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*/
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static inline unsigned long __read_cr3(void)
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{
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return __native_read_cr3();
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}
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static inline void write_cr3(unsigned long x)
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{
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native_write_cr3(x);
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}
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static inline void __write_cr4(unsigned long x)
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{
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native_write_cr4(x);
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}
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static inline void wbinvd(void)
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{
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native_wbinvd();
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}
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#ifdef CONFIG_X86_64
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static inline unsigned long read_cr8(void)
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{
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return native_read_cr8();
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}
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static inline void write_cr8(unsigned long x)
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{
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native_write_cr8(x);
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}
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static inline void load_gs_index(unsigned selector)
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{
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native_load_gs_index(selector);
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}
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#endif
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#endif/* CONFIG_PARAVIRT */
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static inline void clflush(volatile void *__p)
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{
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asm volatile("clflush %0" : "+m" (*(volatile char __force *)__p));
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}
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static inline void clflushopt(volatile void *__p)
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{
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alternative_io(".byte " __stringify(NOP_DS_PREFIX) "; clflush %P0",
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".byte 0x66; clflush %P0",
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X86_FEATURE_CLFLUSHOPT,
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"+m" (*(volatile char __force *)__p));
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}
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static inline void clwb(volatile void *__p)
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{
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volatile struct { char x[64]; } *p = __p;
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asm volatile(ALTERNATIVE_2(
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".byte " __stringify(NOP_DS_PREFIX) "; clflush (%[pax])",
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".byte 0x66; clflush (%[pax])", /* clflushopt (%%rax) */
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X86_FEATURE_CLFLUSHOPT,
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".byte 0x66, 0x0f, 0xae, 0x30", /* clwb (%%rax) */
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X86_FEATURE_CLWB)
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: [p] "+m" (*p)
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: [pax] "a" (p));
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}
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#define nop() asm volatile ("nop")
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#endif /* __KERNEL__ */
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#endif /* _ASM_X86_SPECIAL_INSNS_H */
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