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/linux/arch/um/drivers/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
14 The User-Mode Linux environment allows you to create virtual serial
18 See <http://user-mode-linux.sourceforge.net/old/input.html> for more
24 bool "null channel support"
26 This option enables support for attaching UML consoles and serial
31 bool "port channel support"
33 This option enables support for attaching UML consoles and serial
41 bool "pty channel support"
43 This option enables support for attaching UML consoles and serial
44 lines to host pseudo-terminals. Access to both traditional
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/linux/drivers/acpi/acpica/
H A Dutstrtoul64.c1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4 * Module Name: utstrtoul64 - String-to-integer conversion support for both
5 * 64-bit and 32-bit integers
17 * This module contains the top-level string to 64/32-bit unsigned integer
20 * 1) A standard strtoul() function that supports 64-bit integers, base
21 * 8/10/16, with integer overflow support. This is used mainly by the
23 * constants than the runtime (interpreter) integer-to-string conversions.
29 * iASL - Preprocessor (constants and math expressions)
30 * iASL - Main parser, conversion of constants to integers
31 * iASL - Data Table Compiler parser (constants and math expressions)
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H A Dacutils.h1 /* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
4 * Name: acutils.h -- prototypes for the common (subsystem-wide) procedures
6 * Copyright (C) 2000 - 2026, Intel Corp.
78 * non-iASL case - no redirection, nothing to do
108 acpi_os_printf (" (%8.8X/%s-%u)\n", ACPI_CA_VERSION, module_name, line_number)
110 /* Flags to indicate implicit or explicit string-to-integer conversion */
155 * utascii - ASCII utilities
164 * utcksum - Checksum utilities
177 * utnonansi - Non-ANSI C library functions
186 * utstrsuppt - string-to-integer conversion support functions
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H A Dutstring.c1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
4 * Module Name: utstring - Common functions for strings and characters
19 * PARAMETERS: string - Null terminated ASCII string
20 * max_length - Maximum output length. Used to constrain the
25 * DESCRIPTION: Dump an ASCII string with support for ACPI-defined escape
29 void acpi_ut_print_string(char *string, u16 max_length) in acpi_ut_print_string() argument
33 if (!string) { in acpi_ut_print_string()
34 acpi_os_printf("<\"NULL STRING PTR\">"); in acpi_ut_print_string()
39 for (i = 0; (i < max_length) && string[i]; i++) { in acpi_ut_print_string()
43 switch (string[i]) { in acpi_ut_print_string()
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/linux/fs/xfs/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
3 tristate "XFS filesystem support"
10 on the SGI IRIX platform. It is completely multi-threaded, can
11 support large files and large filesystems, extended attributes,
17 for complete details. This implementation is on-disk compatible
20 To compile this file system support as a module, choose M here: the
26 bool "Support deprecated V4 (crc=0) format"
38 xfs_info against a filesystem mountpoint and checking for a string
39 beginning with "crc=". If the string "crc=0" is found, the
40 filesystem is a V4 filesystem. If no such string is found, please
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/linux/drivers/scsi/pcmcia/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
7 bool "PCMCIA SCSI adapter support"
14 tristate "Adaptec AHA152X PCMCIA support"
25 tristate "Future Domain PCMCIA support"
36 tristate "NinjaSCSI-3 / NinjaSCSI-32Bi (16bit) PCMCIA support"
45 NinjaSCSI-3: (version string: "WBT","NinjaSCSI-3","R1.0")
46 IO-DATA PCSC-FP
47 ALPHA DATA AD-PCS201
48 CyQ've SFC-201
49 LOGITECH LPM-SCSI2E
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/linux/Documentation/filesystems/spufs/
H A Dspufs.rst1 .. SPDX-License-Identifier: GPL-2.0
10 spufs - the SPU file system
26 logical SPU. Users can change permissions on those files, but not actu-
43 The files in spufs mostly follow the standard behavior for regular sys-
44 tem calls like read(2) or write(2), but often support only a subset of
49 All files that support the read(2) operation also support readv(2) and
50 all files that support the write(2) operation also support writev(2).
51 All files support the access(2) and stat(2) family of operations, but
55 All files support the chmod(2)/fchmod(2) and chown(2)/fchown(2) opera-
81 The first SPU to CPU communication mailbox. This file is read-only and
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/linux/scripts/kconfig/tests/transitional/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
4 # Enable module support for tristate testing
6 bool "Enable loadable module support"
28 string "New string option"
32 string
61 string "New string option with precedence"
65 string
/linux/Documentation/admin-guide/pm/
H A Dsleep-states.rst1 .. SPDX-License-Identifier: GPL-2.0
13 Sleep states are global low-power states of the entire system in which user
22 the Linux kernel can support up to four system sleep states, including
28 Suspend-to-Idle
29 ---------------
31 This is a generic, pure software, light-weight variant of system suspend (also
34 I/O devices into low-power states (possibly lower-power than available in the
38 The system is woken up from this state by in-band interrupts, so theoretically
42 This state can be used on platforms without support for :ref:`standby <standby>`
43 or :ref:`suspend-to-RAM <s2ram>`, or it can be used in addition to any of the
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/linux/Documentation/devicetree/bindings/powerpc/
H A Dibm,powerpc-cpu-features.txt3 (skiboot/doc/device-tree/ibm,powerpc-cpu-features/binding.txt)
9 ibm,powerpc-cpu-features binding
19 /cpus/ibm,powerpc-cpu-features node binding
20 -------------------------------------------
22 Node: ibm,powerpc-cpu-features
26 The node name must be "ibm,powerpc-cpu-features".
35 - compatible
37 Value type: string
38 Definition: "ibm,powerpc-cpu-features"
45 - isa
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/linux/tools/arch/x86/kcpuid/
H A Dcpuid.csv1 # SPDX-License-Identifier: CC0-1.0
2 # Generator: x86-cpuid-db v3.1
5 # Auto-generated file.
6 # Please submit all updates and bugfixes to https://x86-cpuid.org
13 # Maximum standard leaf + CPU vendor string
16 0x0, 0, ebx, 31:0, cpu_vendorid_0 , CPU vendor ID string bytes 0 -
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/linux/lib/kunit/
H A DKconfig6 tristate "KUnit - Enable support for unit tests"
9 Enables support for kernel unit tests (KUnit), a lightweight unit
14 Documentation/dev-tools/kunit/.
19 bool "KUnit - Enable /sys/kernel/debug/kunit debugfs representation"
56 itself, lib/kunit/example-test.c, for more information. This option
70 to the KUnit documentation in Documentation/dev-tools/kunit/.
82 In most cases this should be left as Y. Only if additional opt-in
94 In most cases this should be left as Y. Only if additional opt-in
98 string "Default value of the filter_glob module parameter"
100 Sets the default value of kunit.filter_glob. If set to a non-empty
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/linux/tools/power/cpupower/utils/helpers/
H A Dhelpers.h1 /* SPDX-License-Identifier: GPL-2.0-only */
22 #define _(String) gettext(String) argument
24 #define gettext_noop(String) String argument
26 #define N_(String) gettext_noop(String) argument
30 _(String) global() argument
31 N_(String) global() argument
190 cpufreq_has_x86_boost_support(unsigned int cpu,int * support,int * active,int * states) cpufreq_has_x86_boost_support() argument
198 amd_pstate_boost_init(unsigned int cpu,int * support,int * active) amd_pstate_boost_init() argument
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/linux/security/selinux/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
3 bool "SELinux Support"
8 This selects Security-Enhanced Linux (SELinux).
27 bool "SELinux Development Support"
31 This enables the development support option of SELinux,
62 int "SELinux SID to context string translation cache size"
66 This option defines the size of the internal SID -> context string
67 cache, which improves the performance of context to string
84 bool "SELinux kernel debugging support"
94 Documentation/admin-guide/dynamic-debug-howto.rst for additional
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/linux/Documentation/wmi/devices/
H A Dlenovo-wmi-gamezone.rst1 .. SPDX-License-Identifier: GPL-2.0-or-later
4 Lenovo WMI Interface Gamezone Driver (lenovo-wmi-gamezone)
15 -------------
17 WMI GUID ``887B54E3-DDDC-4B2C-8B88-68A26A8835D0``
19 The Gamezone Data WMI interface provides platform-profile and fan curve
27 - low-power, blue LED
28 - balanced, white LED
29 - performance, red LED
30 - max-power, purple LED
31 - custom, purple LED
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/linux/tools/testing/selftests/ftrace/test.d/dynevent/
H A Dbtf_typecast_accepted.tc2 # SPDX-License-Identifier: GPL-2.0
4 …nts "this_cpu_read(<fetcharg>)":README "[(structname[,field])]<argname>[->field[->field|.field...]…
9 if grep -qF "p[:[<group>/][<event>]] <place> [<args>]" README ; then
12 if grep -qF "f[:[<group>/][<event>]] <func-name>[%return] [<args>]" README ; then
16 if [ -z "$KPROBES" -a -z "$FPROBES" ] ; then
23 # Load trace-events-sample module if available to have per-CPU counter structure defined
24 if ! lsmod | grep -q trace_events_sample; then
25 modprobe trace-events-sample || exit_unresolved
30 echo 'f:fpevent1 vfs_read name=(file)file->f_path.dentry->d_name.name:string' >> dynamic_events
32 echo 'f:fpevent2 vfs_read name=(file)(file)->f_path.dentry->d_name.name:string' >> dynamic_events
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/linux/Documentation/firmware-guide/acpi/
H A Dosi.rst1 .. SPDX-License-Identifier: GPL-2.0
22 Linux runs on two groups of machines -- those that are tested by the OEM
41 What should an OEM do if they want to support Linux and Windows
50 In the past the kernel used to support something like:
51 _OSI("Linux-OEM-my_interface_name")
52 where 'OEM' is needed if this is an OEM-specific hook,
54 quirk, a bug, or a bug-fix.
60 any custom Linux-* strings by default.
68 "object that evaluates to a string that identifies the operating system."
71 interpreter in the kernel would return to it a string identifying the OS:
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/linux/Documentation/admin-guide/nfs/
H A Dnfs-client.rst14 and work is in progress on adding support for minor version 1 of the NFSv4
26 string. File open and lock state shared between one client and one server
27 is associated with this identity. To support robust NFSv4 state recovery
28 and transparent state migration, this identity string must not change
31 Without any other intervention, the Linux client uses a string that contains
36 work well as part of an nfs_client_id4 string.
38 The nfs.nfs4_unique_id boot parameter specifies a unique string that can be
43 The nfs.nfs4_unique_id string is typically a UUID, though it can contain
45 nfs4_unique_id string should be chosen when a client system is installed,
49 The string should remain fixed for the lifetime of the client. It can be
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/linux/arch/mips/
H A DKconfig.debug1 # SPDX-License-Identifier: GPL-2.0
30 bool "Built-in kernel command line"
41 The built-in options will be concatenated to the default command
43 command line will be ignored and replaced by the built-in string.
46 the command line from the firmware or the second-stage bootloader.
49 string "Default kernel command string"
55 the default command line, you can supply some command-line options at
64 bool "Built-in command line overrides firmware arguments"
69 Instead, the built-in command line will be used exclusively.
83 bool "Enable compressed kernel support debugging"
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/linux/drivers/pci/hotplug/
H A Dacpi_pcihp.c1 // SPDX-License-Identifier: GPL-2.0+
19 #include <linux/pci-acpi.h>
34 /* acpi_run_oshp - get control of hotplug from the firmware
36 * @handle - the handle of the hotplug controller.
41 struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL }; in acpi_run_oshp() local
43 acpi_get_name(handle, ACPI_FULL_PATHNAME, &string); in acpi_run_oshp()
50 __func__, (char *)string.pointer, status); in acpi_run_oshp()
53 __func__, (char *)string.pointer); in acpi_run_oshp()
56 (char *)string.pointer); in acpi_run_oshp()
58 kfree(string.pointer); in acpi_run_oshp()
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/linux/drivers/base/firmware_loader/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
10 will first look for built-in firmware, if it has any. Next, it will
23 You typically want this built-in (=y) but you can also enable this
25 You also want to be sure to enable this built-in if you are going to
26 enable built-in firmware (CONFIG_EXTRA_FIRMWARE).
54 string "Build named firmware blobs into the kernel binary"
59 kernel firmware files. Built-in firmware searches are preceded
67 This option is a string and takes the (space-separated) names of the
68 firmware files -- the same names that appear in MODULE_FIRMWARE()
81 image since it combines both GPL and non-GPL work. You should
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/linux/Documentation/devicetree/bindings/mfd/
H A Dmaxim,max8925.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lee Jones <lee@kernel.org>
22 interrupt-controller: true
24 "#interrupt-cells":
29 maxim,tsc-irq:
37 "^SDV[1-3]$|^LDO[1-9]$|^LDO1[0-9]$|^LDO20$":
38 description: regulator configuration for SDV1-3 and LDO1-20
47 maxim,max8925-dual-string:
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/linux/Documentation/arch/riscv/
H A Duabi.rst1 .. SPDX-License-Identifier: GPL-2.0
3 RISC-V Linux User ABI
6 ISA string ordering in /proc/cpuinfo
7 ------------------------------------
9 The canonical order of ISA extension names in the ISA string is defined in
10 Chapter 27 of the RISC-V Instruction Set Manual Volume I Unprivileged ISA
16 #. Single-letter extensions come first, in canonical order.
19 #. All multi-letter extensions will be separated from other extensions by an
23 single-letter extensions and before any higher-privileged extensions.
31 #. Standard supervisor-level extensions (starting with 'S') will be listed
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/linux/arch/x86/lib/
H A Dcopy_mc_64.S1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright(c) 2016-2020 Intel Corporation. All rights reserved. */
12 * copy_mc_fragile - copy memory with indication if an exception / fault happened
15 * pains to avoid unrecoverable corner cases like 'fast-string'
17 * boundary. The non-fragile version is equivalent to memcpy()
18 * regardless of CPU machine-check-recovery capability.
30 /* Copy one byte at a time until source is 8-byte aligned */
84 * there is no "tail" handling since the source buffer is 8-byte
97 * we handle faults on multi-byte writes with a byte-by-byte
98 * copy up to the write-protected page.
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/linux/kernel/module/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
3 bool "Enable loadable module support"
64 bool "Debug duplicate modules with auto-loading"
66 Module autoloading allows in-kernel code to request modules through
75 requests are non-fatal virtual memory is a limited resource and each
80 module requests to help identify if module auto-loading may be the
93 non-wait request_module() call is synchronous and waits until modprobe
94 completes. Subsequent auto-loading requests for the same module do
102 abuse was due to module auto-loading. These issues are currently only
105 module auto-loading is not the culprit. There may very well still be
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