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/Documentation/networking/
Ddns_resolver.rst1 .. SPDX-License-Identifier: GPL-2.0
9 - Overview.
10 - Compilation.
11 - Setting up.
12 - Usage.
13 - Mechanism.
14 - Debugging.
22 upcalled to userspace through /sbin/request-key.
25 request-key. It is under development and does not yet provide the full feature
26 set. The features it does support include:
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Dalias.rst1 .. SPDX-License-Identifier: GPL-2.0
4 IP-Aliasing
7 IP-aliases are an obsolete way to manage multiple IP-addresses/masks
8 per interface. Newer tools such as iproute2 support multiple
12 An alias is formed by adding a colon and a string when running ifconfig.
13 This string is usually numeric, but this is not a must.
24 ~~ -> request alias #0 creation (if not yet exists) for eth0
36 ~~~~~~~~~~ -> will delete alias
39 Alias (re-)configuring
/Documentation/filesystems/spufs/
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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/Documentation/devicetree/bindings/usb/
Dusb251xb.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Microchip USB 2.0 Hi-Speed Hub Controller
10 - Richard Leitner <richard.leitner@skidata.com>
15 - microchip,usb2422
16 - microchip,usb2512b
17 - microchip,usb2512bi
18 - microchip,usb2513b
19 - microchip,usb2513bi
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Daspeed,usb-vhub.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 ---
5 $id: http://devicetree.org/schemas/usb/aspeed,usb-vhub.yaml#
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Benjamin Herrenschmidt <benh@kernel.crashing.org>
15 register and several sets of Device and Endpoint registers to support
26 - aspeed,ast2400-usb-vhub
27 - aspeed,ast2500-usb-vhub
28 - aspeed,ast2600-usb-vhub
39 aspeed,vhub-downstream-ports:
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Dusb.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Greg Kroah-Hartman <gregkh@linuxfoundation.org>
22 phy-names:
26 usb-phy:
27 $ref: /schemas/types.yaml#/definitions/phandle-array
37 Tells USB controllers that we want to configure the core to support a
38 UTMI+ PHY with an 8- or 16-bit interface if UTMI+ is selected, UTMI+ low
40 serial is specified and High-Speed Inter-Chip feature if HSIC is
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/Documentation/devicetree/bindings/sifive/
Dsifive-blocks-ip-versioning.txt1 DT compatible string versioning for SiFive open-source IP blocks
4 strings for open-source SiFive IP blocks. HDL for these IP blocks
7 https://github.com/sifive/sifive-blocks
9 IP block-specific DT compatible strings are contained within the HDL,
10 in the form "sifive,<ip-block-name><integer version number>".
14 https://github.com/sifive/sifive-blocks/blob/v1.0/src/main/scala/devices/uart/UART.scala#L43
16 Until these IP blocks (or IP integration) support version
17 auto-discovery, the maintainers of these IP blocks intend to increment
18 the suffixed number in the compatible string whenever the software
22 Driver developers can use compatible string "match" values such as
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/Documentation/admin-guide/
Dbinfmt-misc.rst1 Kernel Support for miscellaneous Binary Formats (binfmt_misc)
9 with which binary. Binfmt_misc recognises the binary-type by matching some bytes
16 mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
18 To actually register a new binary type, you have to set up a string looking like
24 - ``name``
25 is an identifier string. A new /proc file will be created with this
28 - ``type``
30 - ``offset``
34 - ``magic``
35 is the byte sequence binfmt_misc is matching for. The magic string
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/Documentation/devicetree/bindings/powerpc/
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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/Documentation/admin-guide/pm/
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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/Documentation/admin-guide/nfs/
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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/Documentation/devicetree/bindings/mfd/
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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/Documentation/ABI/testing/
Dsysfs-bus-amba9 the device. The override is specified by writing a string to the
10 driver_override file (echo vfio-amba > driver_override) and may
11 be cleared with an empty string (echo > driver_override).
17 not bind to any driver. This also allows devices to opt-out of
20 no support for parsing delimiters.
Dsysfs-bus-vmbus9 device. The override is specified by writing a string to the
11 may be cleared with an empty string (echo > driver_override).
18 opt-out of driver binding using a driver_override name such as
20 there is no support for parsing delimiters.
Dconfigfs-usb-gadget1 What: /config/usb-gadget
5 This group contains sub-groups corresponding to created
8 What: /config/usb-gadget/gadget
18 to bind a gadget, empty string "" to unbind.
21 names are super-speed-plus, super-speed,
22 high-speed, full-speed, and low-speed.
34 What: /config/usb-gadget/gadget/configs
40 What: /config/usb-gadget/gadget/configs/config
51 What: /config/usb-gadget/gadget/configs/config/strings
55 This group contains subdirectories for language-specific
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Dsysfs-bus-vdpa10 Writing "0" to this file disable this feature, any other string
46 the device. The override is specified by writing a string to the
47 driver_override file (echo vhost-vdpa > driver_override) and may
48 be cleared with an empty string (echo > driver_override).
54 not bind to any driver. This also allows devices to opt-out of
57 no support for parsing delimiters.
Dsysfs-bus-usb10 This allows to avoid side-effects with drivers
28 drivers, non-authorized one are not. By default, wired
33 Contact: linux-usb@vger.kernel.org
37 This may allow the driver to support more hardware than
38 was included in the driver's static device ID support
67 What: /sys/bus/usb-serial/drivers/.../new_id
69 Contact: linux-usb@vger.kernel.org
72 extra bus folder "usb-serial" in sysfs; apart from that
84 removing an ID, the driver will no longer support the
97 If CONFIG_PM is set and a USB 2.0 lpm-capable device is plugged
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/Documentation/arch/riscv/
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
14 #. Single-letter extensions come first, in canonical order.
17 #. All multi-letter extensions will be separated from other extensions by an
21 single-letter extensions and before any higher-privileged extensions.
29 #. Standard supervisor-level extensions (starting with 'S') will be listed
30 after standard unprivileged extensions. If multiple supervisor-level
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/Documentation/firmware-guide/acpi/
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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/Documentation/userspace-api/media/mediactl/
Dmedia-ioc-device-info.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 MEDIA_IOC_DEVICE_INFO - Query device information
34 All media devices must support the ``MEDIA_IOC_DEVICE_INFO`` ioctl. To
44 .. flat-table:: struct media_device_info
45 :header-rows: 0
46 :stub-columns: 0
49 * - char
50 - ``driver``\ [16]
51 - Name of the driver implementing the media API as a NUL-terminated
52 ASCII string. The driver version is stored in the
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/Documentation/bpf/
Dprog_cgroup_sysctl.rst1 .. SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
8 provides cgroup-bpf hook for sysctl.
31 (``1``). This field is read-only.
34 or written. This field is read-write. Writing to the field sets the starting
38 when it's called by user space on ``file_pos > 0``. Writing non-zero
40 specified ``file_pos``. Not all sysctl support access with ``file_pos !=
55 If program returns ``0`` user space will get ``-1`` from ``read(2)`` or
67 * ``bpf_sysctl_get_current_value()`` to get string value currently held by
71 * ``bpf_sysctl_get_new_value()`` to get new string value currently being
73 on ``ctx->write == 1``;
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/Documentation/userspace-api/media/v4l/
Dvidioc-g-ext-ctrls.rst1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
13 VIDIOC_G_EXT_CTRLS - VIDIOC_S_EXT_CTRLS - VIDIOC_TRY_EXT_CTRLS - Get or set the value of several co…
44 :ref:`ctrl-class`) and all controls in the control array must belong
56 :ref:`VIDIOC_G_EXT_CTRLS <VIDIOC_G_EXT_CTRLS>` ioctl. String controls must also set the
57 ``string`` field. Controls of compound types
61 relevant for pointer-type controls like strings), then the driver will
63 should re-allocate the memory to this new size and try again. For the
64 string type it is possible that the same issue occurs again if the
65 string has grown in the meantime. It is recommended to call
70 N-dimensional arrays are set and retrieved row-by-row. You cannot set a
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/Documentation/devicetree/bindings/pinctrl/
Dlantiq,pinctrl-falcon.txt4 - compatible: "lantiq,pinctrl-falcon"
5 - reg: Should contain the physical address and length of the gpio/pinmux
8 Please refer to pinctrl-bindings.txt in this directory for details of the
16 pull-up and open-drain
27 We support 2 types of nodes.
31 Required subnode-properties:
32 - lantiq,groups : An array of strings. Each string contains the name of a group.
34 - lantiq,function: A string containing the name of the function to mux to the
49 Required subnode-properties:
50 - lantiq,pins : An array of strings. Each string contains the name of a pin.
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/Documentation/usb/
Dmass-storage.rst9 appearing to the host as a disk or a CD-ROM drive. It supports
12 to read-only, and gadget can indicate that it is removable and/or
13 CD-ROM (the latter implies read-only access).
15 Its requirements are modest; only a bulk-in and a bulk-out endpoint
17 Support is included for full-speed, high-speed and SuperSpeed
20 Note that the driver is slightly non-portable in that it assumes
21 a single memory/DMA buffer will be usable for bulk-in and bulk-out
38 - file=filename[,filename...]
53 simulating CD-ROM, block size of the device if the backing file is
56 - removable=b[,b...]
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/Documentation/devicetree/bindings/interrupt-controller/
Dcsky,apb-intc.txt2 C-SKY APB Interrupt Controller
5 C-SKY APB Interrupt Controller is a simple soc interrupt controller
8 - csky,apb-intc is used in a lot of csky fpgas and socs, it support 64 irq nums.
9 - csky,dual-apb-intc consists of 2 apb-intc and 128 irq nums supported.
10 - csky,gx6605s-intc is gx6605s soc internal irq interrupt controller, 64 irq nums.
20 - compatible
22 Value type: <string>
23 Definition: must be "csky,apb-intc"
24 "csky,dual-apb-intc"
25 "csky,gx6605s-intc"
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