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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>
154 lines
5.0 KiB
Plaintext
154 lines
5.0 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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menu "Kernel hacking"
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config TRACE_IRQFLAGS_SUPPORT
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bool
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default y
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source "lib/Kconfig.debug"
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config EARLY_PRINTK
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bool "Early printk" if EXPERT
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depends on SYS_HAS_EARLY_PRINTK
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default y
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help
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This option enables special console drivers which allow the kernel
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to print messages very early in the bootup process.
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This is useful for kernel debugging when your machine crashes very
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early before the console code is initialized. For normal operation,
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it is not recommended because it looks ugly on some machines and
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doesn't cooperate with an X server. You should normally say N here,
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unless you want to debug such a crash.
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config EARLY_PRINTK_8250
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bool
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depends on EARLY_PRINTK && USE_GENERIC_EARLY_PRINTK_8250
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default y
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help
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"8250/16550 and compatible serial early printk driver"
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If you say Y here, it will be possible to use a 8250/16550 serial
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port as the boot console.
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config USE_GENERIC_EARLY_PRINTK_8250
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bool
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config CMDLINE_BOOL
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bool "Built-in kernel command line"
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default n
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help
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For most systems, it is firmware or second stage bootloader that
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by default specifies the kernel command line options. However,
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it might be necessary or advantageous to either override the
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default kernel command line or add a few extra options to it.
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For such cases, this option allows you to hardcode your own
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command line options directly into the kernel. For that, you
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should choose 'Y' here, and fill in the extra boot arguments
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in CONFIG_CMDLINE.
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The built-in options will be concatenated to the default command
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line if CMDLINE_OVERRIDE is set to 'N'. Otherwise, the default
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command line will be ignored and replaced by the built-in string.
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Most MIPS systems will normally expect 'N' here and rely upon
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the command line from the firmware or the second-stage bootloader.
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config CMDLINE
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string "Default kernel command string"
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depends on CMDLINE_BOOL
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default ""
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help
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On some platforms, there is currently no way for the boot loader to
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pass arguments to the kernel. For these platforms, and for the cases
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when you want to add some extra options to the command line or ignore
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the default command line, you can supply some command-line options at
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build time by entering them here. In other cases you can specify
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kernel args so that you don't have to set them up in board prom
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initialization routines.
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For more information, see the CMDLINE_BOOL and CMDLINE_OVERRIDE
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options.
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config CMDLINE_OVERRIDE
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bool "Built-in command line overrides firmware arguments"
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default n
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depends on CMDLINE_BOOL
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help
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By setting this option to 'Y' you will have your kernel ignore
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command line arguments from firmware or second stage bootloader.
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Instead, the built-in command line will be used exclusively.
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Normally, you will choose 'N' here.
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config SB1XXX_CORELIS
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bool "Corelis Debugger"
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depends on SIBYTE_SB1xxx_SOC
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select DEBUG_INFO if !COMPILE_TEST
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help
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Select compile flags that produce code that can be processed by the
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Corelis mksym utility and UDB Emulator.
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config DEBUG_ZBOOT
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bool "Enable compressed kernel support debugging"
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depends on DEBUG_KERNEL && SYS_SUPPORTS_ZBOOT
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default n
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help
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If you want to add compressed kernel support to a new board, and the
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board supports uart16550 compatible serial port, please select
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SYS_SUPPORTS_ZBOOT_UART16550 for your board and enable this option to
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debug it.
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If your board doesn't support uart16550 compatible serial port, you
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can try to select SYS_SUPPORTS_ZBOOT and use the other methods to
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debug it. for example, add a new serial port support just as
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arch/mips/boot/compressed/uart-16550.c does.
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After the compressed kernel support works, please disable this option
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to reduce the kernel image size and speed up the booting procedure a
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little.
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config SPINLOCK_TEST
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bool "Enable spinlock timing tests in debugfs"
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depends on DEBUG_FS
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default n
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help
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Add several files to the debugfs to test spinlock speed.
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config SCACHE_DEBUGFS
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bool "L2 cache debugfs entries"
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depends on DEBUG_FS
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help
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Enable this to allow parts of the L2 cache configuration, such as
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whether or not prefetching is enabled, to be exposed to userland
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via debugfs.
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If unsure, say N.
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menuconfig MIPS_CPS_NS16550
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bool "CPS SMP NS16550 UART output"
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depends on MIPS_CPS
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help
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Output debug information via an ns16550 compatible UART if exceptions
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occur early in the boot process of a secondary core.
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if MIPS_CPS_NS16550
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config MIPS_CPS_NS16550_BASE
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hex "UART Base Address"
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default 0x1b0003f8 if MIPS_MALTA
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help
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The base address of the ns16550 compatible UART on which to output
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debug information from the early stages of core startup.
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config MIPS_CPS_NS16550_SHIFT
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int "UART Register Shift"
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default 0 if MIPS_MALTA
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help
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The number of bits to shift ns16550 register indices by in order to
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form their addresses. That is, log base 2 of the span between
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adjacent ns16550 registers in the system.
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endif # MIPS_CPS_NS16550
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endmenu
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