License cleanup: add SPDX GPL-2.0 license identifier to files with no license
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>
2017-11-01 08:07:57 -06:00
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/* SPDX-License-Identifier: GPL-2.0 */
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2016-04-29 07:26:05 -06:00
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#ifndef _ASM_POWERPC_TLBFLUSH_RADIX_H
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#define _ASM_POWERPC_TLBFLUSH_RADIX_H
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struct vm_area_struct;
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struct mm_struct;
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struct mmu_gather;
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static inline int mmu_get_ap(int psize)
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{
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return mmu_psize_defs[psize].ap;
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}
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2018-01-30 02:37:21 -07:00
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#ifdef CONFIG_PPC_RADIX_MMU
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powerpc/64s: Improve local TLB flush for boot and MCE on POWER9
There are several cases outside the normal address space management
where a CPU's entire local TLB is to be flushed:
1. Booting the kernel, in case something has left stale entries in
the TLB (e.g., kexec).
2. Machine check, to clean corrupted TLB entries.
One other place where the TLB is flushed, is waking from deep idle
states. The flush is a side-effect of calling ->cpu_restore with the
intention of re-setting various SPRs. The flush itself is unnecessary
because in the first case, the TLB should not acquire new corrupted
TLB entries as part of sleep/wake (though they may be lost).
This type of TLB flush is coded inflexibly, several times for each CPU
type, and they have a number of problems with ISA v3.0B:
- The current radix mode of the MMU is not taken into account, it is
always done as a hash flushn For IS=2 (LPID-matching flush from host)
and IS=3 with HV=0 (guest kernel flush), tlbie(l) is undefined if
the R field does not match the current radix mode.
- ISA v3.0B hash must flush the partition and process table caches as
well.
- ISA v3.0B radix must flush partition and process scoped translations,
partition and process table caches, and also the page walk cache.
So consolidate the flushing code and implement it in C and inline asm
under the mm/ directory with the rest of the flush code. Add ISA v3.0B
cases for radix and hash, and use the radix flush in radix environment.
Provide a way for IS=2 (LPID flush) to specify the radix mode of the
partition. Have KVM pass in the radix mode of the guest.
Take out the flushes from early cputable/dt_cpu_ftrs detection hooks,
and move it later in the boot process after, the MMU registers are set
up and before relocation is first turned on.
The TLB flush is no longer called when restoring from deep idle states.
This was not be done as a separate step because booting secondaries
uses the same cpu_restore as idle restore, which needs the TLB flush.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-12-23 08:15:50 -07:00
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extern void radix__tlbiel_all(unsigned int action);
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2018-01-30 02:37:21 -07:00
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#else
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static inline void radix__tlbiel_all(unsigned int action) { WARN_ON(1); };
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#endif
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powerpc/64s: Improve local TLB flush for boot and MCE on POWER9
There are several cases outside the normal address space management
where a CPU's entire local TLB is to be flushed:
1. Booting the kernel, in case something has left stale entries in
the TLB (e.g., kexec).
2. Machine check, to clean corrupted TLB entries.
One other place where the TLB is flushed, is waking from deep idle
states. The flush is a side-effect of calling ->cpu_restore with the
intention of re-setting various SPRs. The flush itself is unnecessary
because in the first case, the TLB should not acquire new corrupted
TLB entries as part of sleep/wake (though they may be lost).
This type of TLB flush is coded inflexibly, several times for each CPU
type, and they have a number of problems with ISA v3.0B:
- The current radix mode of the MMU is not taken into account, it is
always done as a hash flushn For IS=2 (LPID-matching flush from host)
and IS=3 with HV=0 (guest kernel flush), tlbie(l) is undefined if
the R field does not match the current radix mode.
- ISA v3.0B hash must flush the partition and process table caches as
well.
- ISA v3.0B radix must flush partition and process scoped translations,
partition and process table caches, and also the page walk cache.
So consolidate the flushing code and implement it in C and inline asm
under the mm/ directory with the rest of the flush code. Add ISA v3.0B
cases for radix and hash, and use the radix flush in radix environment.
Provide a way for IS=2 (LPID flush) to specify the radix mode of the
partition. Have KVM pass in the radix mode of the guest.
Take out the flushes from early cputable/dt_cpu_ftrs detection hooks,
and move it later in the boot process after, the MMU registers are set
up and before relocation is first turned on.
The TLB flush is no longer called when restoring from deep idle states.
This was not be done as a separate step because booting secondaries
uses the same cpu_restore as idle restore, which needs the TLB flush.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-12-23 08:15:50 -07:00
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2016-07-13 03:36:43 -06:00
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extern void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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2016-07-13 03:36:35 -06:00
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extern void radix__flush_tlb_range_psize(struct mm_struct *mm, unsigned long start,
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unsigned long end, int psize);
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2016-07-13 03:36:40 -06:00
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extern void radix__flush_pmd_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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2016-04-29 07:26:05 -06:00
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extern void radix__flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end);
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extern void radix__flush_tlb_kernel_range(unsigned long start, unsigned long end);
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extern void radix__local_flush_tlb_mm(struct mm_struct *mm);
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2017-09-03 12:15:12 -06:00
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extern void radix__local_flush_all_mm(struct mm_struct *mm);
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2016-04-29 07:26:05 -06:00
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extern void radix__local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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2016-07-13 03:36:41 -06:00
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extern void radix__local_flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmaddr,
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2016-07-13 03:36:42 -06:00
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int psize);
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2016-04-29 07:26:05 -06:00
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extern void radix__tlb_flush(struct mmu_gather *tlb);
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#ifdef CONFIG_SMP
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extern void radix__flush_tlb_mm(struct mm_struct *mm);
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2017-09-03 12:15:12 -06:00
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extern void radix__flush_all_mm(struct mm_struct *mm);
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2016-04-29 07:26:05 -06:00
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extern void radix__flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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2016-07-13 03:36:41 -06:00
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extern void radix__flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmaddr,
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2016-07-13 03:36:42 -06:00
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int psize);
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2016-04-29 07:26:05 -06:00
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#else
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#define radix__flush_tlb_mm(mm) radix__local_flush_tlb_mm(mm)
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2017-09-03 12:15:12 -06:00
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#define radix__flush_all_mm(mm) radix__local_flush_all_mm(mm)
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2016-04-29 07:26:05 -06:00
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#define radix__flush_tlb_page(vma,addr) radix__local_flush_tlb_page(vma,addr)
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2016-07-13 03:36:41 -06:00
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#define radix__flush_tlb_page_psize(mm,addr,p) radix__local_flush_tlb_page_psize(mm,addr,p)
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2016-04-29 07:26:05 -06:00
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#endif
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2017-07-18 22:49:05 -06:00
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extern void radix__flush_tlb_pwc(struct mmu_gather *tlb, unsigned long addr);
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2017-07-18 22:49:06 -06:00
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extern void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr);
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2016-08-23 04:57:48 -06:00
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extern void radix__flush_tlb_all(void);
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powerpc/64s: Improve local TLB flush for boot and MCE on POWER9
There are several cases outside the normal address space management
where a CPU's entire local TLB is to be flushed:
1. Booting the kernel, in case something has left stale entries in
the TLB (e.g., kexec).
2. Machine check, to clean corrupted TLB entries.
One other place where the TLB is flushed, is waking from deep idle
states. The flush is a side-effect of calling ->cpu_restore with the
intention of re-setting various SPRs. The flush itself is unnecessary
because in the first case, the TLB should not acquire new corrupted
TLB entries as part of sleep/wake (though they may be lost).
This type of TLB flush is coded inflexibly, several times for each CPU
type, and they have a number of problems with ISA v3.0B:
- The current radix mode of the MMU is not taken into account, it is
always done as a hash flushn For IS=2 (LPID-matching flush from host)
and IS=3 with HV=0 (guest kernel flush), tlbie(l) is undefined if
the R field does not match the current radix mode.
- ISA v3.0B hash must flush the partition and process table caches as
well.
- ISA v3.0B radix must flush partition and process scoped translations,
partition and process table caches, and also the page walk cache.
So consolidate the flushing code and implement it in C and inline asm
under the mm/ directory with the rest of the flush code. Add ISA v3.0B
cases for radix and hash, and use the radix flush in radix environment.
Provide a way for IS=2 (LPID flush) to specify the radix mode of the
partition. Have KVM pass in the radix mode of the guest.
Take out the flushes from early cputable/dt_cpu_ftrs detection hooks,
and move it later in the boot process after, the MMU registers are set
up and before relocation is first turned on.
The TLB flush is no longer called when restoring from deep idle states.
This was not be done as a separate step because booting secondaries
uses the same cpu_restore as idle restore, which needs the TLB flush.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-12-23 08:15:50 -07:00
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2018-05-08 20:20:18 -06:00
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extern void radix__flush_tlb_lpid_page(unsigned int lpid,
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unsigned long addr,
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unsigned long page_size);
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extern void radix__flush_pwc_lpid(unsigned int lpid);
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extern void radix__local_flush_tlb_lpid(unsigned int lpid);
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extern void radix__local_flush_tlb_lpid_guest(unsigned int lpid);
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2016-04-29 07:26:05 -06:00
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#endif
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