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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>
213 lines
6 KiB
C
213 lines
6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __SH_CLOCK_H
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#define __SH_CLOCK_H
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#include <linux/list.h>
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#include <linux/seq_file.h>
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#include <linux/cpufreq.h>
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#include <linux/types.h>
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#include <linux/kref.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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struct clk;
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struct clk_mapping {
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phys_addr_t phys;
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void __iomem *base;
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unsigned long len;
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struct kref ref;
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};
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struct sh_clk_ops {
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#ifdef CONFIG_SH_CLK_CPG_LEGACY
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void (*init)(struct clk *clk);
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#endif
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int (*enable)(struct clk *clk);
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void (*disable)(struct clk *clk);
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unsigned long (*recalc)(struct clk *clk);
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int (*set_rate)(struct clk *clk, unsigned long rate);
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int (*set_parent)(struct clk *clk, struct clk *parent);
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long (*round_rate)(struct clk *clk, unsigned long rate);
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};
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#define SH_CLK_DIV_MSK(div) ((1 << (div)) - 1)
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#define SH_CLK_DIV4_MSK SH_CLK_DIV_MSK(4)
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#define SH_CLK_DIV6_MSK SH_CLK_DIV_MSK(6)
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struct clk {
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struct list_head node;
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struct clk *parent;
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struct clk **parent_table; /* list of parents to */
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unsigned short parent_num; /* choose between */
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unsigned char src_shift; /* source clock field in the */
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unsigned char src_width; /* configuration register */
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struct sh_clk_ops *ops;
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struct list_head children;
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struct list_head sibling; /* node for children */
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int usecount;
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unsigned long rate;
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unsigned long flags;
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void __iomem *enable_reg;
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void __iomem *status_reg;
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unsigned int enable_bit;
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void __iomem *mapped_reg;
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unsigned int div_mask;
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unsigned long arch_flags;
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void *priv;
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struct clk_mapping *mapping;
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struct cpufreq_frequency_table *freq_table;
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unsigned int nr_freqs;
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};
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#define CLK_ENABLE_ON_INIT BIT(0)
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#define CLK_ENABLE_REG_32BIT BIT(1) /* default access size */
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#define CLK_ENABLE_REG_16BIT BIT(2)
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#define CLK_ENABLE_REG_8BIT BIT(3)
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#define CLK_MASK_DIV_ON_DISABLE BIT(4)
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#define CLK_ENABLE_REG_MASK (CLK_ENABLE_REG_32BIT | \
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CLK_ENABLE_REG_16BIT | \
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CLK_ENABLE_REG_8BIT)
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/* drivers/sh/clk.c */
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unsigned long followparent_recalc(struct clk *);
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void recalculate_root_clocks(void);
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void propagate_rate(struct clk *);
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int clk_reparent(struct clk *child, struct clk *parent);
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int clk_register(struct clk *);
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void clk_unregister(struct clk *);
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void clk_enable_init_clocks(void);
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struct clk_div_mult_table {
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unsigned int *divisors;
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unsigned int nr_divisors;
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unsigned int *multipliers;
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unsigned int nr_multipliers;
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};
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struct cpufreq_frequency_table;
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void clk_rate_table_build(struct clk *clk,
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struct cpufreq_frequency_table *freq_table,
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int nr_freqs,
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struct clk_div_mult_table *src_table,
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unsigned long *bitmap);
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long clk_rate_table_round(struct clk *clk,
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struct cpufreq_frequency_table *freq_table,
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unsigned long rate);
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int clk_rate_table_find(struct clk *clk,
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struct cpufreq_frequency_table *freq_table,
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unsigned long rate);
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long clk_rate_div_range_round(struct clk *clk, unsigned int div_min,
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unsigned int div_max, unsigned long rate);
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long clk_rate_mult_range_round(struct clk *clk, unsigned int mult_min,
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unsigned int mult_max, unsigned long rate);
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#define SH_CLK_MSTP(_parent, _enable_reg, _enable_bit, _status_reg, _flags) \
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{ \
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.parent = _parent, \
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.enable_reg = (void __iomem *)_enable_reg, \
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.enable_bit = _enable_bit, \
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.status_reg = _status_reg, \
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.flags = _flags, \
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}
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#define SH_CLK_MSTP32(_p, _r, _b, _f) \
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SH_CLK_MSTP(_p, _r, _b, 0, _f | CLK_ENABLE_REG_32BIT)
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#define SH_CLK_MSTP32_STS(_p, _r, _b, _s, _f) \
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SH_CLK_MSTP(_p, _r, _b, _s, _f | CLK_ENABLE_REG_32BIT)
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#define SH_CLK_MSTP16(_p, _r, _b, _f) \
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SH_CLK_MSTP(_p, _r, _b, 0, _f | CLK_ENABLE_REG_16BIT)
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#define SH_CLK_MSTP8(_p, _r, _b, _f) \
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SH_CLK_MSTP(_p, _r, _b, 0, _f | CLK_ENABLE_REG_8BIT)
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int sh_clk_mstp_register(struct clk *clks, int nr);
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/*
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* MSTP registration never really cared about access size, despite the
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* original enable/disable pairs assuming a 32-bit access. Clocks are
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* responsible for defining their access sizes either directly or via the
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* clock definition wrappers.
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*/
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static inline int __deprecated sh_clk_mstp32_register(struct clk *clks, int nr)
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{
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return sh_clk_mstp_register(clks, nr);
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}
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#define SH_CLK_DIV4(_parent, _reg, _shift, _div_bitmap, _flags) \
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{ \
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.parent = _parent, \
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.enable_reg = (void __iomem *)_reg, \
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.enable_bit = _shift, \
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.arch_flags = _div_bitmap, \
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.div_mask = SH_CLK_DIV4_MSK, \
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.flags = _flags, \
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}
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struct clk_div_table {
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struct clk_div_mult_table *div_mult_table;
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void (*kick)(struct clk *clk);
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};
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#define clk_div4_table clk_div_table
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int sh_clk_div4_register(struct clk *clks, int nr,
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struct clk_div4_table *table);
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int sh_clk_div4_enable_register(struct clk *clks, int nr,
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struct clk_div4_table *table);
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int sh_clk_div4_reparent_register(struct clk *clks, int nr,
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struct clk_div4_table *table);
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#define SH_CLK_DIV6_EXT(_reg, _flags, _parents, \
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_num_parents, _src_shift, _src_width) \
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{ \
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.enable_reg = (void __iomem *)_reg, \
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.enable_bit = 0, /* unused */ \
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.flags = _flags | CLK_MASK_DIV_ON_DISABLE, \
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.div_mask = SH_CLK_DIV6_MSK, \
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.parent_table = _parents, \
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.parent_num = _num_parents, \
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.src_shift = _src_shift, \
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.src_width = _src_width, \
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}
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#define SH_CLK_DIV6(_parent, _reg, _flags) \
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{ \
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.parent = _parent, \
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.enable_reg = (void __iomem *)_reg, \
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.enable_bit = 0, /* unused */ \
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.div_mask = SH_CLK_DIV6_MSK, \
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.flags = _flags | CLK_MASK_DIV_ON_DISABLE, \
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}
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int sh_clk_div6_register(struct clk *clks, int nr);
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int sh_clk_div6_reparent_register(struct clk *clks, int nr);
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#define CLKDEV_CON_ID(_id, _clk) { .con_id = _id, .clk = _clk }
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#define CLKDEV_DEV_ID(_id, _clk) { .dev_id = _id, .clk = _clk }
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#define CLKDEV_ICK_ID(_cid, _did, _clk) { .con_id = _cid, .dev_id = _did, .clk = _clk }
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/* .enable_reg will be updated to .mapping on sh_clk_fsidiv_register() */
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#define SH_CLK_FSIDIV(_reg, _parent) \
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{ \
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.enable_reg = (void __iomem *)_reg, \
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.parent = _parent, \
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}
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int sh_clk_fsidiv_register(struct clk *clks, int nr);
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#endif /* __SH_CLOCK_H */
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